March 2022 - FFmpeg-trac - lists.ffmpeg.org

#9674(avfilter:new): -vf maskedmerge results in expected value (-1) for mask values 129 to 255 in 8bit YUV or RGB
by FFmpeg 03 Mar '22

03 Mar '22

#9674: -vf maskedmerge results in expected value (-1) for mask values 129 to 255 in 8bit YUV or RGB -------------------------------------+------------------------------------- Reporter: pdr0 | Type: defect Status: new | Priority: normal Component: avfilter | Version: | unspecified Keywords: maskedmerge | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: How to reproduce: {{{ "D:\\_DOWNLOADS\\ffmpeg-master-latest-win64-gpl_20220302\\bin\\ffmpeg" -report -i black.png -i white.png -i greyscaleramp.png -filter_complex "[0:0][1:0][2:0]maskedmerge" ffmpegmaskedmerge_20220302.png -y ffmpeg version N-105822-g4b72bca6ca-20220302 Copyright (c) 2000-2022 the FFmpeg developers built with gcc 11.2.0 (crosstool-NG 1.24.0.533_681aaef) configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2 --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl --disable-libpulse --enable-libvmaf --disable-libxcb --disable-xlib --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable- libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librist --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --enable-libmfx --enable- libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-librav1e --enable- librubberband --enable-schannel --enable-sdl2 --en libavutil 57. 22.100 / 57. 22.100 libavcodec 59. 21.103 / 59. 21.103 libavformat 59. 17.102 / 59. 17.102 libavdevice 59. 5.100 / 59. 5.100 libavfilter 8. 27.100 / 8. 27.100 libswscale 6. 5.100 / 6. 5.100 libswresample 4. 4.100 / 4. 4.100 libpostproc 56. 4.100 / 56. 4.100 Splitting the commandline. Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'. Reading option '-i' ... matched as input url with argument 'black.png'. Reading option '-i' ... matched as input url with argument 'white.png'. Reading option '-i' ... matched as input url with argument 'greyscaleramp.png'. Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument '[0:0][1:0][2:0]maskedmerge'. Reading option 'ffmpegmaskedmerge_20220302.png' ... matched as output url. Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'. Finished splitting the commandline. Parsing a group of options: global . Applying option report (generate a report) with argument 1. Applying option filter_complex (create a complex filtergraph) with argument [0:0][1:0][2:0]maskedmerge. Applying option y (overwrite output files) with argument 1. Successfully parsed a group of options. Parsing a group of options: input url black.png. Successfully parsed a group of options. Opening an input file: black.png. [NULL @ 0000005d59913bc0] Opening 'black.png' for reading [file @ 0000005d59a1a140] Setting default whitelist 'file,crypto,data' [png_pipe @ 0000005d59913bc0] Format png_pipe probed with size=2048 and score=99 [png_pipe @ 0000005d59913bc0] Before avformat_find_stream_info() pos: 0 bytes read:285 seeks:0 nb_streams:1 [png_pipe @ 0000005d59913bc0] After avformat_find_stream_info() pos: 285 bytes read:285 seeks:0 frames:1 Input #0, png_pipe, from 'black.png': Duration: N/A, bitrate: N/A Stream #0:0, 1, 1/25: Video: png, rgb24(pc), 256x256, 25 fps, 25 tbr, 25 tbn Successfully opened the file. Parsing a group of options: input url white.png. Successfully parsed a group of options. Opening an input file: white.png. [NULL @ 0000005d59a1c700] Opening 'white.png' for reading [file @ 0000005d59a1b380] Setting default whitelist 'file,crypto,data' [png_pipe @ 0000005d59a1c700] Format png_pipe probed with size=2048 and score=99 [png_pipe @ 0000005d59a1c700] Before avformat_find_stream_info() pos: 0 bytes read:773 seeks:0 nb_streams:1 [png_pipe @ 0000005d59a1c700] After avformat_find_stream_info() pos: 773 bytes read:773 seeks:0 frames:1 Input #1, png_pipe, from 'white.png': Duration: N/A, bitrate: N/A Stream #1:0, 1, 1/25: Video: png, rgb24(pc), 256x256, 25 fps, 25 tbr, 25 tbn Successfully opened the file. Parsing a group of options: input url greyscaleramp.png. Successfully parsed a group of options. Opening an input file: greyscaleramp.png. [NULL @ 0000005d59914800] Opening 'greyscaleramp.png' for reading [file @ 0000005d59914ac0] Setting default whitelist 'file,crypto,data' [png_pipe @ 0000005d59914800] Format png_pipe probed with size=2048 and score=99 [png_pipe @ 0000005d59914800] Before avformat_find_stream_info() pos: 0 bytes read:790 seeks:0 nb_streams:1 [png_pipe @ 0000005d59914800] After avformat_find_stream_info() pos: 790 bytes read:790 seeks:0 frames:1 Input #2, png_pipe, from 'greyscaleramp.png': Duration: N/A, bitrate: N/A Stream #2:0, 1, 1/25: Video: png, rgb24(pc), 256x256 [SAR 1:1 DAR 1:1], 25 fps, 25 tbr, 25 tbn Successfully opened the file. Parsing a group of options: output url ffmpegmaskedmerge_20220302.png. Successfully parsed a group of options. Opening an output file: ffmpegmaskedmerge_20220302.png. Successfully opened the file. detected 8 logical cores Stream mapping: Stream #0:0 (png) -> maskedmerge Stream #1:0 (png) -> maskedmerge Stream #2:0 (png) -> maskedmerge maskedmerge:default -> Stream #0:0 (png) Press [q] to stop, [?] for help cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) [graph 0 input from stream 0:0 @ 0000005d5995b740] Setting 'video_size' to value '256x256' [graph 0 input from stream 0:0 @ 0000005d5995b740] Setting 'pix_fmt' to value '2' [graph 0 input from stream 0:0 @ 0000005d5995b740] Setting 'time_base' to value '1/25' [graph 0 input from stream 0:0 @ 0000005d5995b740] Setting 'pixel_aspect' to value '0/1' [graph 0 input from stream 0:0 @ 0000005d5995b740] Setting 'frame_rate' to value '25/1' [graph 0 input from stream 0:0 @ 0000005d5995b740] w:256 h:256 pixfmt:rgb24 tb:1/25 fr:25/1 sar:0/1 [graph 0 input from stream 1:0 @ 0000005d5995c840] Setting 'video_size' to value '256x256' [graph 0 input from stream 1:0 @ 0000005d5995c840] Setting 'pix_fmt' to value '2' [graph 0 input from stream 1:0 @ 0000005d5995c840] Setting 'time_base' to value '1/25' [graph 0 input from stream 1:0 @ 0000005d5995c840] Setting 'pixel_aspect' to value '0/1' [graph 0 input from stream 1:0 @ 0000005d5995c840] Setting 'frame_rate' to value '25/1' [graph 0 input from stream 1:0 @ 0000005d5995c840] w:256 h:256 pixfmt:rgb24 tb:1/25 fr:25/1 sar:0/1 [graph 0 input from stream 2:0 @ 0000005d5995b240] Setting 'video_size' to value '256x256' [graph 0 input from stream 2:0 @ 0000005d5995b240] Setting 'pix_fmt' to value '2' [graph 0 input from stream 2:0 @ 0000005d5995b240] Setting 'time_base' to value '1/25' [graph 0 input from stream 2:0 @ 0000005d5995b240] Setting 'pixel_aspect' to value '1/1' [graph 0 input from stream 2:0 @ 0000005d5995b240] Setting 'frame_rate' to value '25/1' [graph 0 input from stream 2:0 @ 0000005d5995b240] w:256 h:256 pixfmt:rgb24 tb:1/25 fr:25/1 sar:1/1 [format @ 0000005d5995ca40] Setting 'pix_fmts' to value 'rgb24|rgba|rgb48be|rgba64be|pal8|gray|ya8|gray16be|ya16be|monob' [auto_scale_0 @ 0000005d5995cc40] w:iw h:ih flags:'' interl:0 [Parsed_maskedmerge_0 @ 0000005d5995c740] auto-inserting filter 'auto_scale_0' between the filter 'graph 0 input from stream 0:0' and the filter 'Parsed_maskedmerge_0' [auto_scale_1 @ 0000005d5995cb40] w:iw h:ih flags:'' interl:0 [Parsed_maskedmerge_0 @ 0000005d5995c740] auto-inserting filter 'auto_scale_1' between the filter 'graph 0 input from stream 1:0' and the filter 'Parsed_maskedmerge_0' [auto_scale_2 @ 0000005d5995b640] w:iw h:ih flags:'' interl:0 [Parsed_maskedmerge_0 @ 0000005d5995c740] auto-inserting filter 'auto_scale_2' between the filter 'graph 0 input from stream 2:0' and the filter 'Parsed_maskedmerge_0' [auto_scale_3 @ 0000005d5995cd40] w:iw h:ih flags:'' interl:0 [format @ 0000005d5995ca40] auto-inserting filter 'auto_scale_3' between the filter 'Parsed_maskedmerge_0' and the filter 'format' [AVFilterGraph @ 0000005d5997d9c0] query_formats: 6 queried, 5 merged, 4 already done, 0 delayed [auto_scale_0 @ 0000005d5995cc40] picking gbrp out of 61 ref:rgb24 alpha:0 [auto_scale_3 @ 0000005d5995cd40] picking rgb24 out of 10 ref:gbrp alpha:0 [swscaler @ 0000005d5ef82000] [swscaler @ 0000005d5ef8efc0] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5ef82000] [swscaler @ 0000005d5ef9bf80] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5ef82000] [swscaler @ 0000005d5efa8f80] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5ef82000] [swscaler @ 0000005d5efb5f40] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5ef82000] [swscaler @ 0000005d5efcaf00] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5ef82000] [swscaler @ 0000005d5efda180] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5ef82000] [swscaler @ 0000005d5efe8440] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5ef82000] [swscaler @ 0000005d5eff6740] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5ef82000] [swscaler @ 0000005d5f01e800] Forcing full internal H chroma due to input having non subsampled chroma [auto_scale_0 @ 0000005d5995cc40] w:256 h:256 fmt:rgb24 sar:0/1 -> w:256 h:256 fmt:gbrp sar:0/1 flags:0x0 [swscaler @ 0000005d5f02d800] [swscaler @ 0000005d5f03e7c0] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f02d800] [swscaler @ 0000005d5f04b780] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f02d800] [swscaler @ 0000005d5f0614c0] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f02d800] [swscaler @ 0000005d5f06f1c0] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f02d800] [swscaler @ 0000005d5f07cec0] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f02d800] [swscaler @ 0000005d5f096c00] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f02d800] [swscaler @ 0000005d5f0a4900] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f02d800] [swscaler @ 0000005d5f0b5e00] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f02d800] [swscaler @ 0000005d5f0c32c0] Forcing full internal H chroma due to input having non subsampled chroma [auto_scale_1 @ 0000005d5995cb40] w:256 h:256 fmt:rgb24 sar:0/1 -> w:256 h:256 fmt:gbrp sar:0/1 flags:0x0 [swscaler @ 0000005d5f0dc280] [swscaler @ 0000005d5f0eb280] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f0dc280] [swscaler @ 0000005d5f108240] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f0dc280] [swscaler @ 0000005d5f115240] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f0dc280] [swscaler @ 0000005d5f12a200] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f0dc280] [swscaler @ 0000005d5f1371c0] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f0dc280] [swscaler @ 0000005d631500c0] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f0dc280] [swscaler @ 0000005d6315d080] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f0dc280] [swscaler @ 0000005d63172040] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d5f0dc280] [swscaler @ 0000005d6317f040] Forcing full internal H chroma due to input having non subsampled chroma [auto_scale_2 @ 0000005d5995b640] w:256 h:256 fmt:rgb24 sar:1/1 -> w:256 h:256 fmt:gbrp sar:1/1 flags:0x0 [Parsed_maskedmerge_0 @ 0000005d5995c740] [framesync @ 0000005d5995af88] Selected 1/25 time base [Parsed_maskedmerge_0 @ 0000005d5995c740] [framesync @ 0000005d5995af88] Sync level 1 [swscaler @ 0000005d6318c000] [swscaler @ 0000005d6319afc0] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d6318c000] [swscaler @ 0000005d631affc0] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d6318c000] [swscaler @ 0000005d631ccf80] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d6318c000] [swscaler @ 0000005d631e1f80] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d6318c000] [swscaler @ 0000005d631fef40] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d6318c000] [swscaler @ 0000005d6320bf40] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d6318c000] [swscaler @ 0000005d63218f00] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d6318c000] [swscaler @ 0000005d63225ec0] Forcing full internal H chroma due to input having non subsampled chroma [swscaler @ 0000005d6318c000] [swscaler @ 0000005d63232e80] Forcing full internal H chroma due to input having non subsampled chroma [auto_scale_3 @ 0000005d5995cd40] w:256 h:256 fmt:gbrp sar:0/1 -> w:256 h:256 fmt:rgb24 sar:0/1 flags:0x0 Output #0, image2, to 'ffmpegmaskedmerge_20220302.png': Metadata: encoder : Lavf59.17.102 Stream #0:0, 0, 1/25: Video: png, rgb24(pc, gbr/unknown/unknown, progressive), 256x256, q=2-31, 200 kb/s, 25 fps, 25 tbn Metadata: encoder : Lavc59.21.103 png Clipping frame in rate conversion by 0.000008 frame= 1 fps=0.0 q=0.0 size=N/A time=00:00:00.00 bitrate=N/A speed= 0x cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) [Parsed_maskedmerge_0 @ 0000005d5995c740] [framesync @ 0000005d5995af88] Sync level 0 cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) [out_0_0 @ 0000005d5995c940] EOF on sink link out_0_0:default. No more output streams to write to, finishing. [image2 @ 0000005d59919c00] Opening 'ffmpegmaskedmerge_20220302.png' for writing [file @ 0000005d599467c0] Setting default whitelist 'file,crypto,data' [AVIOContext @ 0000005d6542b9c0] Statistics: 1934 bytes written, 0 seeks, 1 writeouts frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=0.215x video:2kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown Input file #0 (black.png): Input stream #0:0 (video): 1 packets read (285 bytes); 1 frames decoded; Total: 1 packets (285 bytes) demuxed Input file #1 (white.png): Input stream #1:0 (video): 1 packets read (773 bytes); 1 frames decoded; Total: 1 packets (773 bytes) demuxed Input file #2 (greyscaleramp.png): Input stream #2:0 (video): 1 packets read (790 bytes); 1 frames decoded; Total: 1 packets (790 bytes) demuxed Output file #0 (ffmpegmaskedmerge_20220302.png): Output stream #0:0 (video): 1 frames encoded; 1 packets muxed (1934 bytes); Total: 1 packets (1934 bytes) muxed 3 frames successfully decoded, 0 decoding errors [AVIOContext @ 0000005d5991c040] Statistics: 285 bytes read, 0 seeks [AVIOContext @ 0000005d59a1cac0] Statistics: 773 bytes read, 0 seeks [AVIOContext @ 0000005d59914cc0] Statistics: 790 bytes read, 0 seeks }}} black.png is RGB 0,0,0 white.png is RGB 255,255,255 greyscaleramp.png is a RGB 0 to 255 ramp, 256x256, where each x position coordinate is equivalent to the R=G=B value The expected output is the same as greyscaleramp.png , ie. 0-255 perfect gradient The output value is (-1) than expected after xpos 128. 255 is never reached, so the 2nd input layer is never fully 100% "opaque" The same trend occur in YUV , using 0,128,128 , 255,128,128, and a full range ramp Y 0 to 255; and the (-1) than expected affects Y only. I did not bother with uploading YUV samples or console output A different (but probably math related bug) affects overlay with embedded alpha channel as the mask, I will probably post a ticket later -- Ticket URL: <https://trac.ffmpeg.org/ticket/9674> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

1 5

#9675(avfilter:new): -vf overlay is not accurate with RGB input using embedded RGBA alpha channel
by FFmpeg 02 Mar '22

02 Mar '22

#9675: -vf overlay is not accurate with RGB input using embedded RGBA alpha channel ----------------------------------+--------------------------------------- Reporter: pdr0 | Type: defect Status: new | Priority: normal Component: avfilter | Version: unspecified Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ----------------------------------+--------------------------------------- Summary of the bug: -vf overlay is not accurate with RGB input using embedded RGBA alpha channel How to reproduce: {{{ "D:\\_DOWNLOADS\\ffmpeg-master-latest-win64-gpl_20220302\\bin\\ffmpeg" -report -i black.png -i white_withalpharamp.png -filter_complex "[0:0][1:0]overlay" ffmpegoverlay_20220302.png -y ffmpeg version N-105822-g4b72bca6ca-20220302 Copyright (c) 2000-2022 the FFmpeg developers built with gcc 11.2.0 (crosstool-NG 1.24.0.533_681aaef) configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2 --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl --disable-libpulse --enable-libvmaf --disable-libxcb --disable-xlib --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable- libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librist --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --enable-libmfx --enable- libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-librav1e --enable- librubberband --enable-schannel --enable-sdl2 --en libavutil 57. 22.100 / 57. 22.100 libavcodec 59. 21.103 / 59. 21.103 libavformat 59. 17.102 / 59. 17.102 libavdevice 59. 5.100 / 59. 5.100 libavfilter 8. 27.100 / 8. 27.100 libswscale 6. 5.100 / 6. 5.100 libswresample 4. 4.100 / 4. 4.100 libpostproc 56. 4.100 / 56. 4.100 Splitting the commandline. Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'. Reading option '-i' ... matched as input url with argument 'black.png'. Reading option '-i' ... matched as input url with argument 'white_withalpharamp.png'. Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument '[0:0][1:0]overlay'. Reading option 'ffmpegoverlay_20220302.png' ... matched as output url. Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'. Finished splitting the commandline. Parsing a group of options: global . Applying option report (generate a report) with argument 1. Applying option filter_complex (create a complex filtergraph) with argument [0:0][1:0]overlay. Applying option y (overwrite output files) with argument 1. Successfully parsed a group of options. Parsing a group of options: input url black.png. Successfully parsed a group of options. Opening an input file: black.png. [NULL @ 000000c64e433b40] Opening 'black.png' for reading [file @ 000000c64c90a040] Setting default whitelist 'file,crypto,data' [png_pipe @ 000000c64e433b40] Format png_pipe probed with size=2048 and score=99 [png_pipe @ 000000c64e433b40] Before avformat_find_stream_info() pos: 0 bytes read:285 seeks:0 nb_streams:1 [png_pipe @ 000000c64e433b40] After avformat_find_stream_info() pos: 285 bytes read:285 seeks:0 frames:1 Input #0, png_pipe, from 'black.png': Duration: N/A, bitrate: N/A Stream #0:0, 1, 1/25: Video: png, rgb24(pc), 256x256, 25 fps, 25 tbr, 25 tbn Successfully opened the file. Parsing a group of options: input url white_withalpharamp.png. Successfully parsed a group of options. Opening an input file: white_withalpharamp.png. [NULL @ 000000c64c90b0c0] Opening 'white_withalpharamp.png' for reading [file @ 000000c64c90c740] Setting default whitelist 'file,crypto,data' [png_pipe @ 000000c64c90b0c0] Format png_pipe probed with size=2048 and score=99 [png_pipe @ 000000c64c90b0c0] Before avformat_find_stream_info() pos: 0 bytes read:972 seeks:0 nb_streams:1 [png_pipe @ 000000c64c90b0c0] After avformat_find_stream_info() pos: 972 bytes read:972 seeks:0 frames:1 Input #1, png_pipe, from 'white_withalpharamp.png': Duration: N/A, bitrate: N/A Stream #1:0, 1, 1/25: Video: png, rgba(pc), 256x256, 25 fps, 25 tbr, 25 tbn Successfully opened the file. Parsing a group of options: output url ffmpegoverlay_20220302.png. Successfully parsed a group of options. Opening an output file: ffmpegoverlay_20220302.png. Successfully opened the file. detected 8 logical cores Stream mapping: Stream #0:0 (png) -> overlay Stream #1:0 (png) -> overlay overlay:default -> Stream #0:0 (png) Press [q] to stop, [?] for help cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) [graph 0 input from stream 0:0 @ 000000c64e46c600] Setting 'video_size' to value '256x256' [graph 0 input from stream 0:0 @ 000000c64e46c600] Setting 'pix_fmt' to value '2' [graph 0 input from stream 0:0 @ 000000c64e46c600] Setting 'time_base' to value '1/25' [graph 0 input from stream 0:0 @ 000000c64e46c600] Setting 'pixel_aspect' to value '0/1' [graph 0 input from stream 0:0 @ 000000c64e46c600] Setting 'frame_rate' to value '25/1' [graph 0 input from stream 0:0 @ 000000c64e46c600] w:256 h:256 pixfmt:rgb24 tb:1/25 fr:25/1 sar:0/1 [graph 0 input from stream 1:0 @ 000000c64e46ca00] Setting 'video_size' to value '256x256' [graph 0 input from stream 1:0 @ 000000c64e46ca00] Setting 'pix_fmt' to value '26' [graph 0 input from stream 1:0 @ 000000c64e46ca00] Setting 'time_base' to value '1/25' [graph 0 input from stream 1:0 @ 000000c64e46ca00] Setting 'pixel_aspect' to value '0/1' [graph 0 input from stream 1:0 @ 000000c64e46ca00] Setting 'frame_rate' to value '25/1' [graph 0 input from stream 1:0 @ 000000c64e46ca00] w:256 h:256 pixfmt:rgba tb:1/25 fr:25/1 sar:0/1 [format @ 000000c64e46c700] Setting 'pix_fmts' to value 'rgb24|rgba|rgb48be|rgba64be|pal8|gray|ya8|gray16be|ya16be|monob' [auto_scale_0 @ 000000c64e46d700] w:iw h:ih flags:'' interl:0 [Parsed_overlay_0 @ 000000c64e46d900] auto-inserting filter 'auto_scale_0' between the filter 'graph 0 input from stream 0:0' and the filter 'Parsed_overlay_0' [auto_scale_1 @ 000000c64e46c800] w:iw h:ih flags:'' interl:0 [Parsed_overlay_0 @ 000000c64e46d900] auto-inserting filter 'auto_scale_1' between the filter 'graph 0 input from stream 1:0' and the filter 'Parsed_overlay_0' [auto_scale_2 @ 000000c64e46c900] w:iw h:ih flags:'' interl:0 [format @ 000000c64e46c700] auto-inserting filter 'auto_scale_2' between the filter 'Parsed_overlay_0' and the filter 'format' [AVFilterGraph @ 000000c64e475380] query_formats: 5 queried, 4 merged, 3 already done, 0 delayed [auto_scale_2 @ 000000c64e46c900] picking rgba out of 10 ref:yuva420p alpha:1 [auto_scale_0 @ 000000c64e46d700] w:256 h:256 fmt:rgb24 sar:0/1 -> w:256 h:256 fmt:yuva420p sar:0/1 flags:0x0 [auto_scale_1 @ 000000c64e46c800] w:256 h:256 fmt:rgba sar:0/1 -> w:256 h:256 fmt:yuva420p sar:0/1 flags:0x0 [Parsed_overlay_0 @ 000000c64e46d900] main w:256 h:256 fmt:yuva420p overlay w:256 h:256 fmt:yuva420p [Parsed_overlay_0 @ 000000c64e46d900] [framesync @ 000000c64e4767e8] Selected 1/25 time base [Parsed_overlay_0 @ 000000c64e46d900] [framesync @ 000000c64e4767e8] Sync level 2 [auto_scale_2 @ 000000c64e46c900] w:256 h:256 fmt:yuva420p sar:0/1 -> w:256 h:256 fmt:rgba sar:0/1 flags:0x0 [Parsed_overlay_0 @ 000000c64e46d900] n:1.000000 t:0.000000 pos:0.000000 x:0.000000 xi:0 y:0.000000 yi:0 Output #0, image2, to 'ffmpegoverlay_20220302.png': Metadata: encoder : Lavf59.17.102 Stream #0:0, 0, 1/25: Video: png, rgba(pc, gbr/unknown/unknown, progressive), 256x256, q=2-31, 200 kb/s, 25 fps, 25 tbn Metadata: encoder : Lavc59.21.103 png Clipping frame in rate conversion by 0.000008 frame= 1 fps=0.0 q=0.0 size=N/A time=00:00:00.00 bitrate=N/A speed= 0x cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) [Parsed_overlay_0 @ 000000c64e46d900] [framesync @ 000000c64e4767e8] Sync level 1 cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) [Parsed_overlay_0 @ 000000c64e46d900] [framesync @ 000000c64e4767e8] Sync level 0 cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream) [out_0_0 @ 000000c64e46c100] EOF on sink link out_0_0:default. No more output streams to write to, finishing. [image2 @ 000000c64e434740] Opening 'ffmpegoverlay_20220302.png' for writing [file @ 000000c64e450440] Setting default whitelist 'file,crypto,data' [AVIOContext @ 000000c652d47ac0] Statistics: 2411 bytes written, 0 seeks, 1 writeouts frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=0.251x video:2kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown Input file #0 (black.png): Input stream #0:0 (video): 1 packets read (285 bytes); 1 frames decoded; Total: 1 packets (285 bytes) demuxed Input file #1 (white_withalpharamp.png): Input stream #1:0 (video): 1 packets read (972 bytes); 1 frames decoded; Total: 1 packets (972 bytes) demuxed Output file #0 (ffmpegoverlay_20220302.png): Output stream #0:0 (video): 1 frames encoded; 1 packets muxed (2411 bytes); Total: 1 packets (2411 bytes) muxed 2 frames successfully decoded, 0 decoding errors [AVIOContext @ 000000c64e43c040] Statistics: 285 bytes read, 0 seeks [AVIOContext @ 000000c64c90c980] Statistics: 972 bytes read, 0 seeks }}} black.png is RGB 0,0,0 white_withalpharamp.png is RGB 255,255,255 with a perfect 0-255 ramp for the alpha channel, 256x256 The expected output is a perfect gradient 0-255, with each xpos having the same R=G=B value. "greyscaleramp.png" is the expected output, and achieved with other programs The ffmpeg observed output has banding , some values are dropped, some are repeated (but at least 0 and 255 are preserved for a binarized mask). This has implications for compositing, greenscreen, non binarized masks This test used RGB inputs, but the log says auto scaling to "fmt:yuva420p" . My guess is there is some swscale issue - maybe RGB is being converted to YUV and back with limited range at 8bit causing the quantization errors , instead of operating as an RGB overlay. Or perhaps the intermediate YUV operation could be performed at a higher bit depth to avoid those issues -- Ticket URL: <https://trac.ffmpeg.org/ticket/9675> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

1 5

#9397(undetermined:new): Allow any ADPCM block size to support XAudio2
by FFmpeg 02 Mar '22

02 Mar '22

#9397: Allow any ADPCM block size to support XAudio2 -------------------------------------+------------------------------------- Reporter: Thomas | Type: Cashman | enhancement Status: new | Priority: normal Component: | Version: undetermined | unspecified Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: Related to https://trac.ffmpeg.org/ticket/6585 and https://github.com/MonoGame/MonoGame/issues/5662 Microsoft measures the size of a block in samples for XAudio2 (https://msdn.microsoft.com/de- de/library/windows/desktop/ee415711(v=vs.85).aspx). From Github thread: FFMPEG forces the block size to be a power of 2 which appears to generate invalid samples per block. A block size of 70 would be needed to generate a valid 128 samples per block. How to reproduce: {{{ % ffmpeg.exe -y -i sample.ogg -vn -c:a adpcm_ms -block_size 70 -b:a 128000 -ar 36000 -f:a wav -strict experimental result.wav ffmpeg version 4.4 Downloaded from https://github.com/BtbN/FFmpeg-Builds/releases }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/9397> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

1 2

#9213(undetermined:new): Ffmpex examples not working
by FFmpeg 02 Mar '22

02 Mar '22

#9213: Ffmpex examples not working ---------------------------------------+---------------------------------- Reporter: Rafael Lopez | Type: defect Status: new | Priority: normal Component: undetermined | Version: 4.3.2 Keywords: h264 examples | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ---------------------------------------+---------------------------------- The video resulting from running the examples is not playable by VLC ./encode_video /tmp/test.mp4 libx264 Also no duration with ffmpeg -i: ffmpeg -i /tmp/test.mp4 ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 8 (Debian 8.3.0-6) configuration: --disable-doc --disable-shared --enable-pic --enable-gpl --enable-nonfree --enable-libtheora --enable-libx264 --enable-openssl --enable-libvpx --prefix=/opt/ffmpeg-4.3.1/ libavutil 56. 51.100 / 56. 51.100 libavcodec 58. 91.100 / 58. 91.100 libavformat 58. 45.100 / 58. 45.100 libavdevice 58. 10.100 / 58. 10.100 libavfilter 7. 85.100 / 7. 85.100 libswscale 5. 7.100 / 5. 7.100 libswresample 3. 7.100 / 3. 7.100 libpostproc 55. 7.100 / 55. 7.100 Input #0, h264, from 'prueba.mp4': ''' Duration: N/A, bitrate: N/A''' Stream #0:0: Video: h264 (High), yuv420p(progressive), 352x288, 25 fps, 25 tbr, 1200k tbn, 50 tbc -- Ticket URL: <https://trac.ffmpeg.org/ticket/9213> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

1 2

#9495(undetermined:new): Does commit 4a71da0f3a need to be reapplied?
by FFmpeg 01 Mar '22

01 Mar '22

#9495: Does commit 4a71da0f3a need to be reapplied? -------------------------------------+------------------------------------- Reporter: msbit | Type: | enhancement Status: new | Priority: normal Component: | Version: git- undetermined | master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- I was looking over the repository as part of answering: https://stackoverflow.com/questions/69839445/seemingly-missing- changes-in-a-git-commit/69840265#69840265 and it does appear that part of the contents of: https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/4a71da0f3a were not applied, namely the following diff: {{{ diff --git a/libavcodec/ac3enc_combined.c b/libavcodec/ac3enc_combined.c index a3f1d27bc5..db832f1f03 100644 --- a/libavcodec/ac3enc_combined.c +++ b/libavcodec/ac3enc_combined.c @@ -19,24 +19,6 @@ typedef struct CombineContext{ #define AC3ENC_TYPE_EAC3 2 #define AC3ENC_TYPE 12354 - -/* common option values */ -#define AC3ENC_OPT_NONE -1 -#define AC3ENC_OPT_AUTO -1 -#define AC3ENC_OPT_OFF 0 -#define AC3ENC_OPT_ON 1 -#define AC3ENC_OPT_NOT_INDICATED 0 -#define AC3ENC_OPT_MODE_ON 1 -#define AC3ENC_OPT_MODE_OFF 2 - -/* specific option values */ -#define AC3ENC_OPT_LARGE_ROOM 1 -#define AC3ENC_OPT_SMALL_ROOM 2 -#define AC3ENC_OPT_DOWNMIX_LTRT 1 -#define AC3ENC_OPT_DOWNMIX_LORO 2 -#define AC3ENC_OPT_ADCONV_STANDARD 0 -#define AC3ENC_OPT_ADCONV_HDCD 1 - #include "ac3enc_opts_template.c" static AVClass ac3enc_class = { "AC-3 Encoder", av_default_item_name, diff --git a/libavcodec/cavsdec.c b/libavcodec/cavsdec.c index fedee8bf72..1b8fedf2b1 100644 --- a/libavcodec/cavsdec.c +++ b/libavcodec/cavsdec.c @@ -133,12 +133,14 @@ static int decode_residual_block(AVSContext *h, GetBitContext *gb, r++; mask = -(level_code & 1); level = (level^mask) - mask; - } else { + } else if (level_code >= 0) { level = r->rltab[level_code][0]; if(!level) //end of block signal break; run = r->rltab[level_code][1]; r += r->rltab[level_code][2]; + } else { + break; } level_buf[i] = level; run_buf[i] = run; }}} prepared by running: {{{ git checkout d912e449b6^1 git merge --no-edit --no-ff d912e449b6^2 git diff d912e449b6 HEAD > 4a71da0f3a.patch }}} This doesn't apply cleaning onto `master`, due to `libavcodec/ac3enc_combined.c` being removed as part of: https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/9f4d37f450 but the `#define`s are present in `libavcodec/ac3enc.h`. -- Ticket URL: <https://trac.ffmpeg.org/ticket/9495> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

1 4

#9476(ffmpeg:new): Unstable outputs ffmpeg (the second one)
by FFmpeg 01 Mar '22

01 Mar '22

#9476: Unstable outputs ffmpeg (the second one) ------------------------------------+-------------------------------------- Reporter: Shaohua Li | Type: defect Status: new | Priority: normal Component: ffmpeg | Version: git-master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ------------------------------------+-------------------------------------- Summary of the bug: For some inputs, ffmpeg's output file will change per run. I have reported a similar issue before (see https://trac.ffmpeg.org/ticket/9272) But that one is a threading issue and ''-threads 1'' makes the issue disappear. However, this seems not to be a threading issue since with ''-threads 1'' the output files still change per run. Compiler: gcc11 How to reproduce: (run the following command several times, and check the size of output.mp4 in each run. ) {{{ % ffmpeg -threads 1 -y -i input.avi -f mp4 output.mp4 ffmpeg version N-104353-g2c734a8496 Copyright (c) 2000-2021 the FFmpeg developers built with gcc 11 (Ubuntu 11.1.0-1ubuntu1~20.04) configuration: --cc=/afl_diff_rand/afl_diff/compilers/gcc11-base/afl-gcc --cxx=/afl_diff_rand/afl_diff/compilers/gcc11-base/afl-g++ --ld='/afl_diff_rand/afl_diff/compilers/gcc11-base/afl-g++ -fno- sanitize=vptr -fno-sanitize=vptr -fno-sanitize=vptr -fno-sanitize=vptr -fno-sanitize=vptr -fno-sanitize=vptr -fno-sanitize=vptr -fno- sanitize=vptr -fno-sanitize=vptr -std=c++11' --extra- cflags=-I/ffmpeg/repo/gcc11-O2/ffmpeg_deps/include --extra- ldflags=-L/ffmpeg/repo/gcc11-O2/ffmpeg_deps/lib --prefix=/ffmpeg/repo/gcc11-O2/ffmpeg_deps --pkg-config-flags=--static --optflags=-O2 --enable-gpl --enable-libass --enable-libfdk-aac --enable- libfreetype --enable-libopus --enable-libtheora --enable-libvorbis --enable-nonfree --disable-shared libavutil 57. 7.100 / 57. 7.100 libavcodec 59. 12.100 / 59. 12.100 libavformat 59. 6.100 / 59. 6.100 libavdevice 59. 0.101 / 59. 0.101 libavfilter 8. 14.100 / 8. 14.100 libswscale 6. 1.100 / 6. 1.100 libswresample 4. 0.100 / 4. 0.100 libpostproc 56. 0.100 / 56. 0.100 }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/9476> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

1 2

#9331(swscale:new): invalid writing in libswscale.so
by FFmpeg 01 Mar '22

01 Mar '22

#9331: invalid writing in libswscale.so -------------------------------------+------------------------------------- Reporter: | Type: defect chuliang_guo | Status: new | Priority: normal Component: swscale | Version: git- | master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- I am trying to using the api from libswscale.so to extract one frame from the sample video. And the program crashed when process the sample video, see the output of gdb and valgrind below. source code for the c code ------------------------------------------------------------------------------- sample.c {{{#!c #include <libavcodec/avcodec.h> #include <libavformat/avformat.h> #include <libavutil/imgutils.h> #include <libswscale/swscale.h> #include <stdio.h> // compatibility with newer API #if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(55, 28, 1) #define av_frame_alloc avcodec_alloc_frame #define av_frame_free avcodec_free_frame #endif void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame) { FILE *pFile; char szFilename[32]; int y; // Open file sprintf(szFilename, "frame%08d.ppm", iFrame); pFile = fopen(szFilename, "wb"); if (pFile == NULL) return; // Write header fprintf(pFile, "P6\n%d %d\n255\n", width, height); // Write pixel data for (y = 0; y < height; y++) fwrite(pFrame->data[0] + y * pFrame->linesize[0], 1, width * 3, pFile); // Close file fclose(pFile); } int main(int argc, char *argv[]) { // Initalizing these to NULL prevents segfaults! AVFormatContext *pFormatCtx = NULL; int i, videoStream; AVCodecContext *pCodecCtxOrig = NULL; AVCodecContext *pCodecCtx = NULL; AVCodecParameters *pCodePar = NULL; AVCodec *pCodec = NULL; AVFrame *pFrame = NULL; AVFrame *pFrameRGB = NULL; AVPacket packet; int frameFinished; int numBytes; uint8_t *buffer = NULL; struct SwsContext *sws_ctx = NULL; if (argc < 2) { printf("Please provide a movie file\n"); return -1; } // Open video file if (avformat_open_input(&pFormatCtx, argv[1], NULL, NULL) != 0) return -1; // Couldn't open file // Retrieve stream information if (avformat_find_stream_info(pFormatCtx, NULL) < 0) return -1; // Couldn't find stream information // Dump information about file onto standard error #ifdef DEBUG av_dump_format(pFormatCtx, 0, argv[1], 0); #endif // Find the first video stream videoStream = -1; for (i = 0; i < pFormatCtx->nb_streams; i++) if (pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) { videoStream = i; break; } if (videoStream == -1) { fprintf(stderr, "couldn't find a video stream"); return -1; // Didn't find a video stream } // Get a pointer to the codec context parameter for the video stream pCodePar = pFormatCtx->streams[videoStream]->codecpar; // Find the decoder for the video stream pCodec = avcodec_find_decoder(pCodePar->codec_id); if (pCodec == NULL) { fprintf(stderr, "Unsupported codec!\n"); return -1; // Codec not found } // Copy context pCodecCtx = avcodec_alloc_context3(pCodec); if (avcodec_parameters_to_context(pCodecCtx, pCodePar) < 0) { fprintf(stderr, "Couldn't copy codec context"); return -1; // Error copying codec context } // Open codec if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) return -1; // Could not open codec // Allocate video frame pFrame = av_frame_alloc(); // Allocate an AVFrame structure pFrameRGB = av_frame_alloc(); if (pFrameRGB == NULL) return -1; // int width = (pCodecCtx->width/16+1)*16; // Determine required buffer size and allocate buffer // numBytes = av_image_get_buffer_size(AV_PIX_FMT_RGB24, width, pCodecCtx->height, 1); numBytes = av_image_get_buffer_size(AV_PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height, 1); buffer = (uint8_t *)av_malloc(numBytes * sizeof(uint8_t)); // Assign appropriate parts of buffer to image planes in pFrameRGB // Note that pFrameRGB is an AVFrame, but AVFrame is a superset // of AVPicture av_image_fill_arrays(pFrameRGB->data, pFrameRGB->linesize, buffer, AV_PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height, 1); // initialize SWS context for software scaling sws_ctx = sws_getContext( pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_RGB24, SWS_BILINEAR, NULL, NULL, NULL); // Read frames and save first five frames to disk i = 0; while (av_read_frame(pFormatCtx, &packet) >= 0) { // Is this a packet from the video stream? if (packet.stream_index == videoStream) { // Decode video frame int ret = avcodec_send_packet(pCodecCtx, &packet); if (ret < 0) { fprintf(stderr, "video error sending a packet"); break; } while (ret >= 0) { ret = avcodec_receive_frame(pCodecCtx, pFrame); if (ret == AVERROR_EOF) { break; } else if (ret == AVERROR(EAGAIN)) { break; } else if (ret < 0) { fprintf(stderr, "Error during decoding\n"); break; } // Convert the image from its native format to RGB sws_scale(sws_ctx, (uint8_t const *const *)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameRGB->data, pFrameRGB->linesize); // Save the frame to disk // if(++i<=5) SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height, i); i++; } if(i==1) break; } // Free the packet that was allocated by av_read_frame av_packet_unref(&packet); } sws_freeContext(sws_ctx); // Free the RGB image av_free(buffer); av_frame_free(&pFrameRGB); // Free the YUV frame av_frame_free(&pFrame); // Close the codecs avcodec_close(pCodecCtx); avcodec_close(pCodecCtxOrig); // Close the video file avformat_close_input(&pFormatCtx); return 0; } }}} ------------------------------------------------------------------------------- Makefile ------------------------------------------------------------------------------- {{{#!Makefile all:sample sample:sample.o gcc sample.o -o sample -L${HOME}/.local/lib -lswscale -lavformat -lavcodec -lavutil -lswscale -lswresample sample.o:sample.c gcc sample.c -g -c -o sample.o -I ${HOME}/.local/include run:sample LD_LIBRARY_PATH=${HOME}/.local/lib ./sample crash.mp4 clean: rm *.o *.ppm -f debug: LD_LIBRARY_PATH=${HOME}/.local/lib gdb --args ./sample crash.mp4 }}} note: I compile the ffmpeg with following command {{{#!shell ./configure --disable-static --disable-avdevice --disable-avfilter \ --disable-bzlib --enable-shared --enable-libvpx --enable-debug=3 \ --disable-stripping --prefix=$HOME/.local make make install }}} the commands for compiling the code are: {{{#!shell make make run }}} the output of the program is: ------------------------------------------------------------------------------- LD_LIBRARY_PATH=/home/u/.local/lib ./sample crash.mp4 *** Error in `./sample': corrupted double-linked list: 0x00000000010bfae0 *** ======= Backtrace: ========= /lib/x86_64-linux-gnu/libc.so.6(+0x777f5)[0x7f82e0eb77f5] /lib/x86_64-linux-gnu/libc.so.6(+0x80c81)[0x7f82e0ec0c81] /lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f82e0ec458c] /home/u/.local/lib/libswscale.so.6(sws_freeContext+0x49)[0x7f82e1260889] ./sample[0x4015cc] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f82e0e60840] ./sample[0x400ee9] ======= Memory map: ======== 00400000-00402000 r-xp 00000000 08:01 3945328 /home/u/source/sample 00601000-00602000 r--p 00001000 08:01 3945328 /home/u/source/sample 00602000-00603000 rw-p 00002000 08:01 3945328 /home/u/source/sample 01072000-011ea000 rw-p 00000000 00:00 0 [heap] 7f82d8000000-7f82d8021000 rw-p 00000000 00:00 0 7f82d8021000-7f82dc000000 ---p 00000000 00:00 0 7f82dfa83000-7f82dfa99000 r-xp 00000000 08:01 4067980 /lib/x86_64-linux-gnu/libgcc_s.so.1 7f82dfa99000-7f82dfc98000 ---p 00016000 08:01 4067980 /lib/x86_64-linux-gnu/libgcc_s.so.1 7f82dfc98000-7f82dfc99000 rw-p 00015000 08:01 4067980 /lib/x86_64-linux-gnu/libgcc_s.so.1 7f82dfc99000-7f82dfc9c000 r-xp 00000000 08:01 4063318 /lib/x86_64-linux-gnu/libdl-2.23.so 7f82dfc9c000-7f82dfe9b000 ---p 00003000 08:01 4063318 /lib/x86_64-linux-gnu/libdl-2.23.so 7f82dfe9b000-7f82dfe9c000 r--p 00002000 08:01 4063318 /lib/x86_64-linux-gnu/libdl-2.23.so 7f82dfe9c000-7f82dfe9d000 rw-p 00003000 08:01 4063318 /lib/x86_64-linux-gnu/libdl-2.23.so 7f82dfe9d000-7f82dfebe000 r-xp 00000000 08:01 4068009 /lib/x86_64-linux-gnu/liblzma.so.5.0.0 7f82dfebe000-7f82e00bd000 ---p 00021000 08:01 4068009 /lib/x86_64-linux-gnu/liblzma.so.5.0.0 7f82e00bd000-7f82e00be000 r--p 00020000 08:01 4068009 /lib/x86_64-linux-gnu/liblzma.so.5.0.0 7f82e00be000-7f82e00bf000 rw-p 00021000 08:01 4068009 /lib/x86_64-linux-gnu/liblzma.so.5.0.0 7f82e00bf000-7f82e02de000 r-xp 00000000 08:01 5776643 /usr/lib/x86_64-linux-gnu/libvpx.so.3.0.0 7f82e02de000-7f82e04dd000 ---p 0021f000 08:01 5776643 /usr/lib/x86_64-linux-gnu/libvpx.so.3.0.0 7f82e04dd000-7f82e04df000 r--p 0021e000 08:01 5776643 /usr/lib/x86_64-linux-gnu/libvpx.so.3.0.0 7f82e04df000-7f82e04e0000 rw-p 00220000 08:01 5776643 /usr/lib/x86_64-linux-gnu/libvpx.so.3.0.0 7f82e04e0000-7f82e04e3000 rw-p 00000000 00:00 0 7f82e04e3000-7f82e04fd000 r-xp 00000000 08:01 4463252 /home/u/.local/lib/libswresample.so.4.0.100 7f82e04fd000-7f82e06fd000 ---p 0001a000 08:01 4463252 /home/u/.local/lib/libswresample.so.4.0.100 7f82e06fd000-7f82e06ff000 r--p 0001a000 08:01 4463252 /home/u/.local/lib/libswresample.so.4.0.100 7f82e06ff000-7f82e0700000 rw-p 0001c000 08:01 4463252 /home/u/.local/lib/libswresample.so.4.0.100 7f82e0700000-7f82e0718000 r-xp 00000000 08:01 4063257 /lib/x86_64-linux-gnu/libpthread-2.23.so 7f82e0718000-7f82e0917000 ---p 00018000 08:01 4063257 /lib/x86_64-linux-gnu/libpthread-2.23.so 7f82e0917000-7f82e0918000 r--p 00017000 08:01 4063257 /lib/x86_64-linux-gnu/libpthread-2.23.so 7f82e0918000-7f82e0919000 rw-p 00018000 08:01 4063257 /lib/x86_64-linux-gnu/libpthread-2.23.so 7f82e0919000-7f82e091d000 rw-p 00000000 00:00 0 7f82e091d000-7f82e0936000 r-xp 00000000 08:01 4068133 /lib/x86_64-linux-gnu/libz.so.1.2.8 7f82e0936000-7f82e0b35000 ---p 00019000 08:01 4068133 /lib/x86_64-linux-gnu/libz.so.1.2.8 7f82e0b35000-7f82e0b36000 r--p 00018000 08:01 4068133 /lib/x86_64-linux-gnu/libz.so.1.2.8 7f82e0b36000-7f82e0b37000 rw-p 00019000 08:01 4068133 /lib/x86_64-linux-gnu/libz.so.1.2.8 7f82e0b37000-7f82e0c3f000 r-xp 00000000 08:01 4063326 /lib/x86_64-linux-gnu/libm-2.23.so 7f82e0c3f000-7f82e0e3e000 ---p 00108000 08:01 4063326 /lib/x86_64-linux-gnu/libm-2.23.so 7f82e0e3e000-7f82e0e3f000 r--p 00107000 08:01 4063326 /lib/x86_64-linux-gnu/libm-2.23.so 7f82e0e3f000-7f82e0e40000 rw-p 00108000 08:01 4063326 /lib/x86_64-linux-gnu/libm-2.23.so 7f82e0e40000-7f82e1000000 r-xp 00000000 08:01 4067959 /lib/x86_64-linux-gnu/libc-2.23.so 7f82e1000000-7f82e1200000 ---p 001c0000 08:01 4067959 /lib/x86_64-linux-gnu/libc-2.23.so 7f82e1200000-7f82e1204000 r--p 001c0000 08:01 4067959 /lib/x86_64-linux-gnu/libc-2.23.so 7f82e1204000-7f82e1206000 rw-p 001c4000 08:01 4067959 /lib/x86_64-linux-gnu/libc-2.23.so 7f82e1206000-7f82e120a000 rw-p 00000000 00:00 0 7f82e120a000-7f82e1292000 r-xp 00000000 08:01 4463254 /home/u/.local/lib/libswscale.so.6.0.100 7f82e1292000-7f82e1492000 ---p 00088000 08:01 4463254 /home/u/.local/lib/libswscale.so.6.0.100 7f82e1492000-7f82e1493000 r--p 00088000 08:01 4463254 /home/u/.local/lib/libswscale.so.6.0.100 7f82e1493000-7f82e1494000 rw-p 00089000 08:01 4463254 /home/u/.local/lib/libswscale.so.6.0.100 7f82e1494000-7f82e149c000 rw-p 00000000 00:00 0 7f82e149c000-7f82e153e000 r-xp 00000000 08:01 4463256 /home/u/.local/lib/libavutil.so.57.0.100 7f82e153e000-7f82e173e000 ---p 000a2000 08:01 4463256 /home/u/.local/lib/libavutil.so.57.0.100 7f82e173e000-7f82e1746000 r--p 000a2000 08:01 4463256 /home/u/.local/lib/libavutil.so.57.0.100 7f82e1746000-7f82e1747000 rw-p 000aa000 08:01 4463256 /home/u/.local/lib/libavutil.so.57.0.100 7f82e1747000-7f82e1856000 rw-p 00000000 00:00 0 7f82e1856000-7f82e252a000 r-xp 00000000 08:01 4463250 /home/u/.local/lib/libavcodec.so.59.3.101 7f82e252a000-7f82e272a000 ---p 00cd4000 08:01 4463250 /home/u/.local/lib/libavcodec.so.59.3.101 7f82e272a000-7f82e2789000 r--p 00cd4000 08:01 4463250 /home/u/.local/lib/libavcodec.so.59.3.101 7f82e2789000-7f82e278c000 rw-p 00d33000 08:01 4463250 /home/u/.local/lib/libavcodec.so.59.3.101 7f82e278c000-7f82e2d5f000 rw-p 00000000 00:00 0 7f82e2d5f000-7f82e2fa5000 r-xp 00000000 08:01 4463247 /home/u/.local/lib/libavformat.so.59.4.100 7f82e2fa5000-7f82e31a5000 ---p 00246000 08:01 4463247 /home/u/.local/lib/libavformat.so.59.4.100 7f82e31a5000-7f82e31d4000 r--p 00246000 08:01 4463247 /home/u/.local/lib/libavformat.so.59.4.100 7f82e31d4000-7f82e31d5000 rw-p 00275000 08:01 4463247 /home/u/.local/lib/libavformat.so.59.4.100 7f82e31d5000-7f82e31d6000 rw-p 00000000 00:00 0 7f82e31d6000-7f82e31fc000 r-xp 00000000 08:01 4063323 /lib/x86_64-linux-gnu/ld-2.23.so 7f82e335d000-7f82e3385000 rw-p 00000000 00:00 0 7f82e33aa000-7f82e33d8000 rw-p 00000000 00:00 0 7f82e33f8000-7f82e33fb000 rw-p 00000000 00:00 0 7f82e33fb000-7f82e33fc000 r--p 00025000 08:01 4063323 /lib/x86_64-linux-gnu/ld-2.23.so 7f82e33fc000-7f82e33fd000 rw-p 00026000 08:01 4063323 /lib/x86_64-linux-gnu/ld-2.23.so 7f82e33fd000-7f82e33fe000 rw-p 00000000 00:00 0 7ffd00323000-7ffd00344000 rw-p 00000000 00:00 0 [stack] 7ffd003f4000-7ffd003f7000 r--p 00000000 00:00 0 [vvar] 7ffd003f7000-7ffd003f9000 r-xp 00000000 00:00 0 [vdso] ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall] Aborted (core dumped) ------------------------------------------------------------------------------- and the valgrind commands and output is ------------------------------------------------------------------------------- ==14608== Memcheck, a memory error detector ==14608== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al. ==14608== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info ==14608== Command: ./sample crash.mp4 ==14608== --14608-- WARNING: Serious error when reading debug info --14608-- When reading debug info from /home/u/.local/lib/libavcodec.so.59.3.101: --14608-- get_Form_contents: DW_FORM_strp points outside .debug_str --14608-- WARNING: Serious error when reading debug info --14608-- When reading debug info from /home/u/.local/lib/libavutil.so.57.0.100: --14608-- get_Form_contents: DW_FORM_strp points outside .debug_str --14608-- WARNING: Serious error when reading debug info --14608-- When reading debug info from /home/u/.local/lib/libswscale.so.6.0.100: --14608-- get_Form_contents: DW_FORM_strp points outside .debug_str --14608-- WARNING: Serious error when reading debug info --14608-- When reading debug info from /home/u/.local/lib/libswresample.so.4.0.100: --14608-- get_Form_contents: DW_FORM_strp points outside .debug_str ==14608== Invalid write of size 8 ==14608== at 0x6BE4F96: ??? (in /home/u/.local/lib/libswscale.so.6.0.100) ==14608== by 0x6BE3B33: yuv420_rgb24_ssse3 (yuv2rgb_template.c:177) ==14608== by 0x6BB5D90: sws_scale (swscale.c:989) ==14608== by 0x401542: main (sample.c:152) ==14608== Address 0x86b9b5a is 306,714 bytes inside a block of size 306,720 alloc'd ==14608== at 0x4C2FFC6: memalign (in /usr/lib/valgrind /vgpreload_memcheck-amd64-linux.so) ==14608== by 0x4C300D1: posix_memalign (in /usr/lib/valgrind /vgpreload_memcheck-amd64-linux.so) ==14608== by 0x67E960F: av_malloc (mem.c:87) ==14608== by 0x40137A: main (sample.c:116) ==14608== ==14608== Invalid write of size 8 ==14608== at 0x6BE4F9B: ??? (in /home/u/.local/lib/libswscale.so.6.0.100) ==14608== by 0x6BE3B33: yuv420_rgb24_ssse3 (yuv2rgb_template.c:177) ==14608== by 0x6BB5D90: sws_scale (swscale.c:989) ==14608== by 0x401542: main (sample.c:152) ==14608== Address 0x86b9b62 is 2 bytes after a block of size 306,720 alloc'd ==14608== at 0x4C2FFC6: memalign (in /usr/lib/valgrind /vgpreload_memcheck-amd64-linux.so) ==14608== by 0x4C300D1: posix_memalign (in /usr/lib/valgrind /vgpreload_memcheck-amd64-linux.so) ==14608== by 0x67E960F: av_malloc (mem.c:87) ==14608== by 0x40137A: main (sample.c:116) ==14608== ==14608== ==14608== HEAP SUMMARY: ==14608== in use at exit: 3,063 bytes in 5 blocks ==14608== total heap usage: 694 allocs, 689 frees, 4,138,888 bytes allocated ==14608== ==14608== 48 bytes in 1 blocks are indirectly lost in loss record 1 of 5 ==14608== at 0x4C2FFC6: memalign (in /usr/lib/valgrind /vgpreload_memcheck-amd64-linux.so) ==14608== by 0x4C300D1: posix_memalign (in /usr/lib/valgrind /vgpreload_memcheck-amd64-linux.so) ==14608== by 0x67E960F: av_malloc (mem.c:87) ==14608== by 0x67E96DD: av_mallocz (mem.c:246) ==14608== by 0x67D3ADC: av_buffer_create (buffer.c:36) ==14608== by 0x67D3BC6: av_buffer_alloc (buffer.c:76) ==14608== by 0x543C4F7: av_grow_packet (avpacket.c:148) ==14608== by 0x4FE9ABA: append_packet_chunked (utils.c:260) ==14608== by 0x4F29847: mov_read_packet (mov.c:7897) ==14608== by 0x4FEE6EF: ff_read_packet (utils.c:802) ==14608== by 0x4FEF2D4: read_frame_internal (utils.c:1492) ==14608== by 0x4FF405A: avformat_find_stream_info (utils.c:3746) ==14608== by 0x401180: main (sample.c:65) ==14608== ==14608== 105 bytes in 1 blocks are indirectly lost in loss record 2 of 5 ==14608== at 0x4C2FFC6: memalign (in /usr/lib/valgrind /vgpreload_memcheck-amd64-linux.so) ==14608== by 0x4C300D1: posix_memalign (in /usr/lib/valgrind /vgpreload_memcheck-amd64-linux.so) ==14608== by 0x67E960F: av_malloc (mem.c:87) ==14608== by 0x67E96DD: av_mallocz (mem.c:246) ==14608== by 0x54B7823: avcodec_parameters_to_context (codec_par.c:194) ==14608== by 0x4012BC: main (sample.c:95) ==14608== ==14608== 1,025 (920 direct, 105 indirect) bytes in 1 blocks are definitely lost in loss record 3 of 5 ==14608== at 0x4C2FFC6: memalign (in /usr/lib/valgrind /vgpreload_memcheck-amd64-linux.so) ==14608== by 0x4C300D1: posix_memalign (in /usr/lib/valgrind /vgpreload_memcheck-amd64-linux.so) ==14608== by 0x67E960F: av_malloc (mem.c:87) ==14608== by 0x58532F2: avcodec_alloc_context3 (options.c:143) ==14608== by 0x40129F: main (sample.c:94) ==14608== ==14608== 1,966 bytes in 1 blocks are indirectly lost in loss record 4 of 5 ==14608== at 0x4C2FFC6: memalign (in /usr/lib/valgrind /vgpreload_memcheck-amd64-linux.so) ==14608== by 0x4C300D1: posix_memalign (in /usr/lib/valgrind /vgpreload_memcheck-amd64-linux.so) ==14608== by 0x67E960F: av_malloc (mem.c:87) ==14608== by 0x67D3BA5: av_buffer_alloc (buffer.c:72) ==14608== by 0x543C4F7: av_grow_packet (avpacket.c:148) ==14608== by 0x4FE9ABA: append_packet_chunked (utils.c:260) ==14608== by 0x4F29847: mov_read_packet (mov.c:7897) ==14608== by 0x4FEE6EF: ff_read_packet (utils.c:802) ==14608== by 0x4FEF2D4: read_frame_internal (utils.c:1492) ==14608== by 0x4FF405A: avformat_find_stream_info (utils.c:3746) ==14608== by 0x401180: main (sample.c:65) ==14608== ==14608== 2,038 (24 direct, 2,014 indirect) bytes in 1 blocks are definitely lost in loss record 5 of 5 ==14608== at 0x4C2FFC6: memalign (in /usr/lib/valgrind /vgpreload_memcheck-amd64-linux.so) ==14608== by 0x4C300D1: posix_memalign (in /usr/lib/valgrind /vgpreload_memcheck-amd64-linux.so) ==14608== by 0x67E960F: av_malloc (mem.c:87) ==14608== by 0x67E96DD: av_mallocz (mem.c:246) ==14608== by 0x67D3B15: av_buffer_create (buffer.c:49) ==14608== by 0x67D3BC6: av_buffer_alloc (buffer.c:76) ==14608== by 0x543C4F7: av_grow_packet (avpacket.c:148) ==14608== by 0x4FE9ABA: append_packet_chunked (utils.c:260) ==14608== by 0x4F29847: mov_read_packet (mov.c:7897) ==14608== by 0x4FEE6EF: ff_read_packet (utils.c:802) ==14608== by 0x4FEF2D4: read_frame_internal (utils.c:1492) ==14608== by 0x4FF405A: avformat_find_stream_info (utils.c:3746) ==14608== by 0x401180: main (sample.c:65) ==14608== ==14608== LEAK SUMMARY: ==14608== definitely lost: 944 bytes in 2 blocks ==14608== indirectly lost: 2,119 bytes in 3 blocks ==14608== possibly lost: 0 bytes in 0 blocks ==14608== still reachable: 0 bytes in 0 blocks ==14608== suppressed: 0 bytes in 0 blocks ==14608== ==14608== For counts of detected and suppressed errors, rerun with: -v ==14608== ERROR SUMMARY: 5 errors from 4 contexts (suppressed: 0 from 0) ------------------------------------------------------------------------------- I tried to see the c code of libswscale.so.6.0.100 which causes the invalid writing, so I reconfigure ffmpeg and compiled with following command. ------------------------------------------------------------------------------- ./configure --disable-static --disable-avdevice --disable-avfilter \ --disable-bzlib --enable-shared --enable-libvpx --enable-debug=3 \ --disable-stripping --prefix=$HOME/.local make make install ------------------------------------------------------------------------------- but this time, with the new compiled shared library, the program runs well and extract the first frame of the video and save it as picture. So, I started using gdb to debug the assemble code in the function ff_yuv_420_rgb24_ssse3, and at last I found the code is writen by assembler language in the file libswscale/x86/yuv_2_rgb.asm, and the invalid writing is in line 271 and 272 when write the values of m0 and m1 to memory ------------------------------------------------------------------------------- libswscale/x86/yuv_2_rgb.asm {{{#!asm 268 por m2, m7 269 por m1, m6 ; g5 b5 r6 g6 b6 r7 g7 b7 r8 g8 b8 r9 g9 b9 r10 g10 270 por m2, m3 ; b10 r11 g11 b11 r12 g12 b12 r13 g13 b13 r14 g14 b14 r15 g15 b15 271 movu [imageq], m0 272 movu [imageq + 16], m1 273 movu [imageq + 32], m2 }}} ------------------------------------------------------------------------------- gdb output ------------------------------------------------------------------------------- For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from ./sample... (gdb) r Starting program: /home/u/source/sample crash.mp4 [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". *** Error in `/home/u/source/sample': corrupted double-linked list: 0x0000000000650ae0 *** ======= Backtrace: ========= /lib/x86_64-linux-gnu/libc.so.6(+0x777f5)[0x7ffff5ab87f5] /lib/x86_64-linux-gnu/libc.so.6(+0x80c81)[0x7ffff5ac1c81] /lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7ffff5ac558c] /home/u/.local/lib/libswscale.so.6(sws_freeContext+0x49)[0x7ffff5e61889] /home/u/source/sample[0x4015cc] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7ffff5a61840] /home/u/source/sample[0x400ee9] ======= Memory map: ======== 00400000-00402000 r-xp 00000000 08:01 3945328 /home/u/source/sample 00601000-00602000 r--p 00001000 08:01 3945328 /home/u/source/sample 00602000-00603000 rw-p 00002000 08:01 3945328 /home/u/source/sample 00603000-0077b000 rw-p 00000000 00:00 0 [heap] 7ffff0000000-7ffff0021000 rw-p 00000000 00:00 0 7ffff0021000-7ffff4000000 ---p 00000000 00:00 0 7ffff4684000-7ffff469a000 r-xp 00000000 08:01 4067980 /lib/x86_64-linux-gnu/libgcc_s.so.1 7ffff469a000-7ffff4899000 ---p 00016000 08:01 4067980 /lib/x86_64-linux-gnu/libgcc_s.so.1 7ffff4899000-7ffff489a000 rw-p 00015000 08:01 4067980 /lib/x86_64-linux-gnu/libgcc_s.so.1 7ffff489a000-7ffff489d000 r-xp 00000000 08:01 4063318 /lib/x86_64-linux-gnu/libdl-2.23.so 7ffff489d000-7ffff4a9c000 ---p 00003000 08:01 4063318 /lib/x86_64-linux-gnu/libdl-2.23.so 7ffff4a9c000-7ffff4a9d000 r--p 00002000 08:01 4063318 /lib/x86_64-linux-gnu/libdl-2.23.so 7ffff4a9d000-7ffff4a9e000 rw-p 00003000 08:01 4063318 /lib/x86_64-linux-gnu/libdl-2.23.so 7ffff4a9e000-7ffff4abf000 r-xp 00000000 08:01 4068009 /lib/x86_64-linux-gnu/liblzma.so.5.0.0 7ffff4abf000-7ffff4cbe000 ---p 00021000 08:01 4068009 /lib/x86_64-linux-gnu/liblzma.so.5.0.0 7ffff4cbe000-7ffff4cbf000 r--p 00020000 08:01 4068009 /lib/x86_64-linux-gnu/liblzma.so.5.0.0 7ffff4cbf000-7ffff4cc0000 rw-p 00021000 08:01 4068009 /lib/x86_64-linux-gnu/liblzma.so.5.0.0 7ffff4cc0000-7ffff4edf000 r-xp 00000000 08:01 5776643 /usr/lib/x86_64-linux-gnu/libvpx.so.3.0.0 7ffff4edf000-7ffff50de000 ---p 0021f000 08:01 5776643 /usr/lib/x86_64-linux-gnu/libvpx.so.3.0.0 7ffff50de000-7ffff50e0000 r--p 0021e000 08:01 5776643 /usr/lib/x86_64-linux-gnu/libvpx.so.3.0.0 7ffff50e0000-7ffff50e1000 rw-p 00220000 08:01 5776643 /usr/lib/x86_64-linux-gnu/libvpx.so.3.0.0 7ffff50e1000-7ffff50e4000 rw-p 00000000 00:00 0 7ffff50e4000-7ffff50fe000 r-xp 00000000 08:01 4463252 /home/u/.local/lib/libswresample.so.4.0.100 7ffff50fe000-7ffff52fe000 ---p 0001a000 08:01 4463252 /home/u/.local/lib/libswresample.so.4.0.100 7ffff52fe000-7ffff5300000 r--p 0001a000 08:01 4463252 /home/u/.local/lib/libswresample.so.4.0.100 7ffff5300000-7ffff5301000 rw-p 0001c000 08:01 4463252 /home/u/.local/lib/libswresample.so.4.0.100 7ffff5301000-7ffff5319000 r-xp 00000000 08:01 4063257 /lib/x86_64-linux-gnu/libpthread-2.23.so 7ffff5319000-7ffff5518000 ---p 00018000 08:01 4063257 /lib/x86_64-linux-gnu/libpthread-2.23.so 7ffff5518000-7ffff5519000 r--p 00017000 08:01 4063257 /lib/x86_64-linux-gnu/libpthread-2.23.so 7ffff5519000-7ffff551a000 rw-p 00018000 08:01 4063257 /lib/x86_64-linux-gnu/libpthread-2.23.so 7ffff551a000-7ffff551e000 rw-p 00000000 00:00 0 7ffff551e000-7ffff5537000 r-xp 00000000 08:01 4068133 /lib/x86_64-linux-gnu/libz.so.1.2.8 7ffff5537000-7ffff5736000 ---p 00019000 08:01 4068133 /lib/x86_64-linux-gnu/libz.so.1.2.8 7ffff5736000-7ffff5737000 r--p 00018000 08:01 4068133 /lib/x86_64-linux-gnu/libz.so.1.2.8 7ffff5737000-7ffff5738000 rw-p 00019000 08:01 4068133 /lib/x86_64-linux-gnu/libz.so.1.2.8 7ffff5738000-7ffff5840000 r-xp 00000000 08:01 4063326 /lib/x86_64-linux-gnu/libm-2.23.so 7ffff5840000-7ffff5a3f000 ---p 00108000 08:01 4063326 /lib/x86_64-linux-gnu/libm-2.23.so 7ffff5a3f000-7ffff5a40000 r--p 00107000 08:01 4063326 /lib/x86_64-linux-gnu/libm-2.23.so 7ffff5a40000-7ffff5a41000 rw-p 00108000 08:01 4063326 /lib/x86_64-linux-gnu/libm-2.23.so 7ffff5a41000-7ffff5c01000 r-xp 00000000 08:01 4067959 /lib/x86_64-linux-gnu/libc-2.23.so 7ffff5c01000-7ffff5e01000 ---p 001c0000 08:01 4067959 /lib/x86_64-linux-gnu/libc-2.23.so 7ffff5e01000-7ffff5e05000 r--p 001c0000 08:01 4067959 /lib/x86_64-linux-gnu/libc-2.23.so 7ffff5e05000-7ffff5e07000 rw-p 001c4000 08:01 4067959 /lib/x86_64-linux-gnu/libc-2.23.so 7ffff5e07000-7ffff5e0b000 rw-p 00000000 00:00 0 7ffff5e0b000-7ffff5e93000 r-xp 00000000 08:01 4463254 /home/u/.local/lib/libswscale.so.6.0.100 7ffff5e93000-7ffff6093000 ---p 00088000 08:01 4463254 /home/u/.local/lib/libswscale.so.6.0.100 7ffff6093000-7ffff6094000 r--p 00088000 08:01 4463254 /home/u/.local/lib/libswscale.so.6.0.100 7ffff6094000-7ffff6095000 rw-p 00089000 08:01 4463254 /home/u/.local/lib/libswscale.so.6.0.100 7ffff6095000-7ffff609d000 rw-p 00000000 00:00 0 7ffff609d000-7ffff613f000 r-xp 00000000 08:01 4463256 /home/u/.local/lib/libavutil.so.57.0.100 7ffff613f000-7ffff633f000 ---p 000a2000 08:01 4463256 /home/u/.local/lib/libavutil.so.57.0.100 7ffff633f000-7ffff6347000 r--p 000a2000 08:01 4463256 /home/u/.local/lib/libavutil.so.57.0.100 7ffff6347000-7ffff6348000 rw-p 000aa000 08:01 4463256 /home/u/.local/lib/libavutil.so.57.0.100 7ffff6348000-7ffff6457000 rw-p 00000000 00:00 0 7ffff6457000-7ffff712b000 r-xp 00000000 08:01 4463250 /home/u/.local/lib/libavcodec.so.59.3.101 7ffff712b000-7ffff732b000 ---p 00cd4000 08:01 4463250 /home/u/.local/lib/libavcodec.so.59.3.101 7ffff732b000-7ffff738a000 r--p 00cd4000 08:01 4463250 /home/u/.local/lib/libavcodec.so.59.3.101 7ffff738a000-7ffff738d000 rw-p 00d33000 08:01 4463250 /home/u/.local/lib/libavcodec.so.59.3.101 7ffff738d000-7ffff7960000 rw-p 00000000 00:00 0 7ffff7960000-7ffff7ba6000 r-xp 00000000 08:01 4463247 /home/u/.local/lib/libavformat.so.59.4.100 7ffff7ba6000-7ffff7da6000 ---p 00246000 08:01 4463247 /home/u/.local/lib/libavformat.so.59.4.100 7ffff7da6000-7ffff7dd5000 r--p 00246000 08:01 4463247 /home/u/.local/lib/libavformat.so.59.4.100 7ffff7dd5000-7ffff7dd6000 rw-p 00275000 08:01 4463247 /home/u/.local/lib/libavformat.so.59.4.100 7ffff7dd6000-7ffff7dd7000 rw-p 00000000 00:00 0 7ffff7dd7000-7ffff7dfd000 r-xp 00000000 08:01 4063323 /lib/x86_64-linux-gnu/ld-2.23.so 7ffff7f59000-7ffff7f81000 rw-p 00000000 00:00 0 7ffff7fa6000-7ffff7fd4000 rw-p 00000000 00:00 0 7ffff7ff4000-7ffff7ff7000 rw-p 00000000 00:00 0 7ffff7ff7000-7ffff7ffa000 r--p 00000000 00:00 0 [vvar] 7ffff7ffa000-7ffff7ffc000 r-xp 00000000 00:00 0 [vdso] 7ffff7ffc000-7ffff7ffd000 r--p 00025000 08:01 4063323 /lib/x86_64-linux-gnu/ld-2.23.so 7ffff7ffd000-7ffff7ffe000 rw-p 00026000 08:01 4063323 /lib/x86_64-linux-gnu/ld-2.23.so 7ffff7ffe000-7ffff7fff000 rw-p 00000000 00:00 0 7ffffffde000-7ffffffff000 rw-p 00000000 00:00 0 [stack] ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall] Program received signal SIGABRT, Aborted. 0x00007ffff5a76438 in raise () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) bt #0 0x00007ffff5a76438 in raise () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007ffff5a7803a in abort () from /lib/x86_64-linux-gnu/libc.so.6 #2 0x00007ffff5ab87fa in ?? () from /lib/x86_64-linux-gnu/libc.so.6 #3 0x00007ffff5ac1c81 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 #4 0x00007ffff5ac558c in free () from /lib/x86_64-linux-gnu/libc.so.6 #5 0x00007ffff5e61889 in sws_freeContext (c=0x619680) at libswscale/utils.c:2253 #6 0x00000000004015cc in main (argc=2, argv=0x7fffffffe048) at sample.c:168 (gdb) info registers rax 0x0 0 rbx 0x5b 91 rcx 0x7ffff5a76438 140737314776120 rdx 0x6 6 rsi 0x3963 14691 rdi 0x3963 14691 rbp 0x7fffffffdd80 0x7fffffffdd80 rsp 0x7fffffffd9e8 0x7fffffffd9e8 r8 0x5 5 r9 0x0 0 r10 0x8 8 r11 0x206 518 r12 0x5b 91 r13 0x7fffffffdb98 140737488346008 r14 0x7fffffffdb98 140737488346008 r15 0x2 2 rip 0x7ffff5a76438 0x7ffff5a76438 <raise+56> eflags 0x206 [ PF IF ] cs 0x33 51 ss 0x2b 43 ds 0x0 0 es 0x0 0 fs 0x0 0 gs 0x0 0 ------------------------------------------------------------------------------- After analysis of the assembly code, I found what is wrong about this code, the assembly code accelerates the process of convert yuv to rgb by using sse2 register and write 16 rgb values (48 bytes) to memory once a time, and the resolution of the crash.mp4 is 426*240, and ff_yuv_420_rgb24_ssse3 process 426 pixels in a loop, which induces the problem: when the width of video frame is not a multiply of 16, extra wrong yuv pixel is read from the memory and writing extra rgb value to the memory allocated for the output image and cause the invalid writing. and I found the solution to my problem, when I call av_image_get_buffer_size the width of the image is change to a larger value which is a multiply of 16 {{{#!c int width = (pCodecCtx->width/16+1)*16; numBytes = av_image_get_buffer_size(AV_PIX_FMT_RGB24, width, pCodecCtx->height, 1); }}} But I think the change of width should be implemented inside the av_image_get_buffer_size function, or changing assembly code ff_yuv_420_rgb24_ssse3 to process image without size limitation. -- Ticket URL: <https://trac.ffmpeg.org/ticket/9331> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

1 4

Re: [FFmpeg-trac] #1759(avformat:closed): Bad video DTS value
by FFmpeg 01 Mar '22

01 Mar '22

#1759: Bad video DTS value -------------------------------------+------------------------------------- Reporter: Nikola | Owner: (none) Vranic | Type: defect | Status: closed Priority: normal | Component: avformat Version: git-master | Resolution: | needs_more_info Keywords: DTS | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Changes (by Elon Musk): * status: new => closed * resolution: => needs_more_info Comment: I see nowhere proof that DTS -1 is against specification of format. -- Ticket URL: <https://trac.ffmpeg.org/ticket/1759#comment:4> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

1 0

#9670(undetermined:new): RTP with custom IO hangs on av_read_frame
by FFmpeg 01 Mar '22

01 Mar '22

#9670: RTP with custom IO hangs on av_read_frame -------------------------------------+------------------------------------- Reporter: kevmo314 | Type: defect Status: new | Priority: normal Component: | Version: undetermined | unspecified Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- If I construct an avio alloc context for RTP packets with avio_alloc_context(buf, 1500, 0, NULL, read_func, NULL, NULL) ie, not setting write_flag, that read_packet in rtsp.c will hang, specifically these two lines: https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/rtsp.c#L2183-L2184 The custom IO attempts to write a receiver report and infinite-loops when calling avio_write(). I think to fix this, this line: if (len > 0 && (*rtsp_st)->transport_priv && rt->transport == RTSP_TRANSPORT_RTP) should also check the write_flag: if (len > 0 && (*rtsp_st)->transport_priv && rt->transport == RTSP_TRANSPORT_RTP && s->pb->write_flag) because currently it seems to assume that RTCP packets can be written, which is not necessarily true with custom IO. I can provide a more detailed reproduction script if necessary, but given the relatively simple fix I'm hoping the above information is sufficient. -- Ticket URL: <https://trac.ffmpeg.org/ticket/9670> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

1 1