April 2019 - FFmpeg-trac - lists.ffmpeg.org

Re: [FFmpeg-trac] #1261(swscale:reopened): yellowish color with resize and -pix_fmt pal8
by FFmpeg 01 Apr '19

01 Apr '19

#1261: yellowish color with resize and -pix_fmt pal8 ------------------------------------+------------------------------------ Reporter: ami_stuff | Owner: Type: defect | Status: reopened Priority: normal | Component: swscale Version: git-master | Resolution: Keywords: pal8 | Blocked By: Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | ------------------------------------+------------------------------------ Changes (by gdgsdg123): * status: closed => reopened * resolution: fixed => Comment: Build from: https://ffmpeg.zeranoe.com/builds/win64/static/ffmpeg-20190331-27c94c5-win6… {{{ ffmpeg -report -i "C:\Image-before-scaling.png" -pix_fmt pal8 -sws_flags bicubic+accurate_rnd+full_chroma_int -vf scale=iw*2:ih*2 bicubic_text.png }}} gives bitexact result... (bitexact as previous) [[BR]] [[BR]] [[BR]] Previous command: {{{ ffmpeg -report -i "C:\Image-before-scaling.png" -pix_fmt pal8 -sws_flags bicubic+accurate_rnd -vf scale=iw*2:ih*2 bicubic_text.png }}} [[BR]] [[BR]] [[BR]] [[BR]] [[BR]] Log: {{{ ffmpeg started on 2019-04-02 at 04:40:24 Report written to "ffmpeg-20190402-044024.log" Command line: ffmpeg -report -i "C:\\Image-before-scaling.png" -pix_fmt pal8 -sws_flags bicubic+accurate_rnd+full_chroma_int -vf "scale=iw*2:ih*2" bicubic_text.png ffmpeg version N-93506-g27c94c57dc Copyright (c) 2000-2019 the FFmpeg developers built with gcc 8.2.1 (GCC) 20190212 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable- fontconfig --enable-gnutls --enable-iconv --enable-libass --enable- libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable- libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable- nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt libavutil 56. 26.100 / 56. 26.100 libavcodec 58. 48.100 / 58. 48.100 libavformat 58. 26.101 / 58. 26.101 libavdevice 58. 7.100 / 58. 7.100 libavfilter 7. 48.100 / 7. 48.100 libswscale 5. 4.100 / 5. 4.100 libswresample 3. 4.100 / 3. 4.100 libpostproc 55. 4.100 / 55. 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 'C:\Image- before-scaling.png'. Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'pal8'. Reading option '-sws_flags' ... matched as AVOption 'sws_flags' with argument 'bicubic+accurate_rnd+full_chroma_int'. Reading option '-vf' ... matched as option 'vf' (set video filters) with argument 'scale=iw*2:ih*2'. Reading option 'bicubic_text.png' ... matched as output url. Finished splitting the commandline. Parsing a group of options: global . Applying option report (generate a report) with argument 1. Successfully parsed a group of options. Parsing a group of options: input url C:\Image-before-scaling.png. Successfully parsed a group of options. Opening an input file: C:\Image-before-scaling.png. [NULL @ 0000000000501a00] Opening 'C:\Image-before-scaling.png' for reading [file @ 00000000005033c0] Setting default whitelist 'file,crypto' [png_pipe @ 0000000000501a00] Format png_pipe probed with size=2048 and score=99 [png_pipe @ 0000000000501a00] Before avformat_find_stream_info() pos: 0 bytes read:716 seeks:0 nb_streams:1 [png_pipe @ 0000000000501a00] After avformat_find_stream_info() pos: 716 bytes read:716 seeks:0 frames:1 Input #0, png_pipe, from 'C:\Image-before-scaling.png': Duration: N/A, bitrate: N/A Stream #0:0, 1, 1/25: Video: png, pal8(pc), 109x40, 25 tbr, 25 tbn, 25 tbc Successfully opened the file. Parsing a group of options: output url bicubic_text.png. Applying option pix_fmt (set pixel format) with argument pal8. Applying option vf (set video filters) with argument scale=iw*2:ih*2. Successfully parsed a group of options. Opening an output file: bicubic_text.png. Successfully opened the file. detected 16 logical cores Stream mapping: Stream #0:0 -> #0:0 (png (native) -> png (native)) Press [q] to stop, [?] for help cur_dts is invalid (this is harmless if it occurs once at the start per stream) cur_dts is invalid (this is harmless if it occurs once at the start per stream) [Parsed_scale_0 @ 0000000002a4dcc0] Setting 'w' to value 'iw*2' [Parsed_scale_0 @ 0000000002a4dcc0] Setting 'h' to value 'ih*2' [Parsed_scale_0 @ 0000000002a4dcc0] Setting 'flags' to value 'bicubic' [Parsed_scale_0 @ 0000000002a4dcc0] Setting 'sws_flags' to value 'bicubic+accurate_rnd+full_chroma_int' [Parsed_scale_0 @ 0000000002a4dcc0] w:iw*2 h:ih*2 flags:'bicubic' interl:0 [graph 0 input from stream 0:0 @ 0000000002a4efc0] Setting 'video_size' to value '109x40' [graph 0 input from stream 0:0 @ 0000000002a4efc0] Setting 'pix_fmt' to value '11' [graph 0 input from stream 0:0 @ 0000000002a4efc0] Setting 'time_base' to value '1/25' [graph 0 input from stream 0:0 @ 0000000002a4efc0] Setting 'pixel_aspect' to value '0/1' [graph 0 input from stream 0:0 @ 0000000002a4efc0] Setting 'sws_param' to value 'flags=2' [graph 0 input from stream 0:0 @ 0000000002a4efc0] Setting 'frame_rate' to value '25/1' [graph 0 input from stream 0:0 @ 0000000002a4efc0] w:109 h:40 pixfmt:pal8 tb:1/25 fr:25/1 sar:0/1 sws_param:flags=2 [format @ 0000000002a59440] Setting 'pix_fmts' to value 'pal8' [AVFilterGraph @ 0000000002a4d600] query_formats: 4 queried, 3 merged, 0 already done, 0 delayed [Parsed_scale_0 @ 0000000002a4dcc0] w:109 h:40 fmt:pal8 sar:0/1 -> w:218 h:80 fmt:pal8 sar:0/1 flags:0x4 Output #0, image2, to 'bicubic_text.png': Metadata: encoder : Lavf58.26.101 Stream #0:0, 0, 1/25: Video: png, pal8, 218x80, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc Metadata: encoder : Lavc58.48.100 png Clipping frame in rate conversion by 0.000008 cur_dts is invalid (this is harmless if it occurs once at the start per stream) cur_dts is invalid (this is harmless if it occurs once at the start per stream) [out_0_0 @ 0000000002a59280] EOF on sink link out_0_0:default. No more output streams to write to, finishing. [image2 @ 0000000000503500] Opening 'bicubic_text.png' for writing [file @ 0000000002a80bc0] Setting default whitelist 'file,crypto' [AVIOContext @ 000000000a329900] Statistics: 0 seeks, 1 writeouts frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=4.44x video:3kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown Input file #0 (C:\Image-before-scaling.png): Input stream #0:0 (video): 1 packets read (716 bytes); 1 frames decoded; Total: 1 packets (716 bytes) demuxed Output file #0 (bicubic_text.png): Output stream #0:0 (video): 1 frames encoded; 1 packets muxed (3380 bytes); Total: 1 packets (3380 bytes) muxed 1 frames successfully decoded, 0 decoding errors [AVIOContext @ 000000000050b640] Statistics: 716 bytes read, 0 seeks }}} [[BR]] [[BR]] Highlight: {{{ [swscaler @ 000000000297a840] Forcing full internal H chroma due to input having non subsampled chroma }}} is missing. (comparing to previous log) [[BR]] [[BR]] Which implied `full_chroma_int` are set in both operations. [[BR]] [[BR]] [[BR]] [[BR]] [[BR]] Off-topic: What's the difference between `full_chroma_int` and `full_chroma_inp`?.. And their relationship? (dependencies, etc...) -- Ticket URL: <https://trac.ffmpeg.org/ticket/1261#comment:7> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#7817(avformat:new): Fails to parse mp4 header
by FFmpeg 01 Apr '19

01 Apr '19

#7817: Fails to parse mp4 header ----------------------------------+-------------------------------------- Reporter: Rodeo | Type: defect Status: new | Priority: normal Component: avformat | Version: git-master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ----------------------------------+-------------------------------------- Submitted by !HandBrake user: https://forum.handbrake.fr/viewtopic.php?f=11&t=38897&p=183585#p183572 Also fails with git master: ffmpeg -i 01_0001.mp4 ffmpeg version N-93476-g391f884675 Copyright (c) 2000-2019 the FFmpeg developers built with Apple LLVM version 10.0.1 (clang-1001.0.46.3) configuration: libavutil 56. 26.100 / 56. 26.100 libavcodec 58. 47.106 / 58. 47.106 libavformat 58. 26.101 / 58. 26.101 libavdevice 58. 7.100 / 58. 7.100 libavfilter 7. 48.100 / 7. 48.100 libswscale 5. 4.100 / 5. 4.100 libswresample 3. 4.100 / 3. 4.100 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f88b3000000] error reading header 01_0001.mp4: Invalid data found when processing input Sample above 10 MB (NSFW) available here: https://www.dropbox.com/s/tb5dox5ulywf14q/01_0001.mp4?dl=0 Sample appears to play fine in VLC, FWIW. -- Ticket URL: <https://trac.ffmpeg.org/ticket/7817> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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Re: [FFmpeg-trac] #1261(swscale:closed): yellowish color with resize and -pix_fmt pal8
by FFmpeg 01 Apr '19

01 Apr '19

#1261: yellowish color with resize and -pix_fmt pal8 ------------------------------------+----------------------------------- Reporter: ami_stuff | Owner: Type: defect | Status: closed Priority: normal | Component: swscale Version: git-master | Resolution: fixed Keywords: pal8 | Blocked By: Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | ------------------------------------+----------------------------------- Changes (by cehoyos): * keywords: swscale, pal8 => pal8 * status: open => closed * resolution: => fixed Comment: The original issue was fixed by Michael in a830915b78e2d96f08dc93b2d1c4330448b83ffd, see ticket #3028, work-around was to force `full_chroma_int`. -- Ticket URL: <https://trac.ffmpeg.org/ticket/1261#comment:6> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#7788(ffmpeg:new): Custom-compiled FFmpeg 4.1.1 crashes on MacOS when reading files
by FFmpeg 01 Apr '19

01 Apr '19

#7788: Custom-compiled FFmpeg 4.1.1 crashes on MacOS when reading files -------------------------------------+---------------------------------- Reporter: Jim_ChamSys | Type: defect Status: new | Priority: normal Component: ffmpeg | Version: 4.1 Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+---------------------------------- Hi there, We bundle a version of FFmpeg with our software, in order to perform video transcoding. We compile this ourselves, to remove GPL-licensed code, and enable the VP9 codec. Recently, we've upgraded our FFmpeg to version 4.1.1 (from 3.2.4); this has worked well on Windows and Linux platforms, but we're finding that our Mac version is segfaulting (signal 11) whenever it attempts to read certain video files. We don't have many different videos to test with, but it's been seen to crash with .wmv and .mpv files, but not with .mov files. I've attached an archive that contains the binary executable and libraries we've built, the flags given to the configure script, and a test video that exhibits the issue. The output when running FFmpeg through lldb is as follows: {{{ $ lldb -- ffmpeg -i ~/Movies/Robotica_72011.mpv (lldb) target create "ffmpeg" Current executable set to 'ffmpeg' (x86_64). (lldb) settings set -- target.run-args "-i" "/Users/buildbot/Movies/Robotica_72011.mpv" (lldb) run Process 91647 launched: '/usr/local/bin/ffmpeg' (x86_64) ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers built with Apple LLVM version 8.1.0 (clang-802.0.38) configuration: --sysroot= --prefix=/usr/local/ --datadir=/usr/local/share/ffmpeg --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-doc --disable-network --enable-shared --disable-static --disable-gpl --disable-protocols --enable-protocol=data --enable-protocol=file --enable-protocol=pipe --enable-protocol=unix --enable-libvpx --disable-encoders --enable-encoder=pcm_s16le --enable- encoder=ljpeg --enable-encoder=mjpeg --enable-encoder=jpegls --enable- encoder=jpeg2000 --enable-encoder=png --enable-encoder=bmp --enable- encoder=libvpx_vp8 --enable-encoder=libvpx_vp9 --enable-decoder=png --enable-decoder=h264 --disable-bzlib --disable-lzma --enable-zlib --disable-openssl --disable-sdl2 --disable-securetransport --disable- libxcb --disable-devices --enable-lto --enable-pic --extra-ldflags=' libavutil 56. 22.100 / 56. 22.100 libavcodec 58. 35.100 / 58. 35.100 libavformat 58. 20.100 / 58. 20.100 libavdevice 58. 5.100 / 58. 5.100 libavfilter 7. 40.101 / 7. 40.101 libswscale 5. 3.100 / 5. 3.100 libswresample 3. 3.100 / 3. 3.100 Process 91647 stopped * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=EXC_I386_GPFLT) frame #0: 0x00000001009dbd72 libavcodec.58.dylib`ff_blockdsp_init + 134 libavcodec.58.dylib`ff_blockdsp_init: -> 0x1009dbd72 <+134>: movdqa %xmm0, (%rbx) 0x1009dbd76 <+138>: andl $0x8004000, %eax ; imm = 0x8004000 0x1009dbd7b <+143>: cmpl $0x4000, %eax ; imm = 0x4000 0x1009dbd80 <+148>: jne 0x1009dbd9a ; <+174> }}} As you can see, the only element of the backtrace is 'ff_blockdsp_init()'. We've reproduced this issue on three separate Mac computers (One running OSX 10.11, and two running OSX 10.13.6), and we've seen the exact same trace on all three, and with different video files. Possibly related: In another part of the project, we're also making calls into libavcodec directly (in order to probe for video length, etc.), and we've been seeing similar Mac crashes on the same files; I suspect this is the same issue, although it doesn't happen reliably on all machines tested, and I've had a much harder time investigating it. I'd be happy to provide more details if needed. Thanks for any assistance you can give. -- Ticket URL: <https://trac.ffmpeg.org/ticket/7788> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#7804(undetermined:new): ffmpeg exit code
by FFmpeg 01 Apr '19

01 Apr '19

#7804: ffmpeg exit code -------------------------------------+------------------------------------- Reporter: razvan | Type: defect Status: new | Priority: normal Component: | Version: git- undetermined | master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- I think I found an inconsistency in the exit code of fmpeg when reading http stream: if I give ffmpeg a incorrect input url ffmpeg -i http://.... which is not found on the streaming server then ffmpeg report "HTTP error 404 Not Found" and exit code is 1 I think this is correct as ffmpeg completes with an error, so exit code !=0 If input url is correct and it starts reading it and so on (save the stream for example), and after a while, the server return again "HTTP error 404 Not Found" for some chunk then ffmpeg exit with code 0. [hls,applehttp @ 0x6e0f6c0] Opening 'http://...../chunklist_w222613001.m3u8' for reading [http @ 0x6e18100] Opening 'http://..../media_w222613001_15571.aac' for reading [hls,applehttp @ 0x6e0f6c0] Opening 'http://..../media_w222613001_15571.aac' for reading [http @ 0x6e6c0c0] Opening 'http://misatv.ro:1935/LiveMSTV_Safe/livestream_ao/chunklist_w222613001.m3u8' for reading [hls,applehttp @ 0x6e0f6c0] Opening 'http://.../chunklist_w222613001.m3u8' for reading [http @ 0x6e70600] HTTP error 404 Not Found [hls,applehttp @ 0x6e0f6c0] Failed to reload playlist 0 [hls,applehttp @ 0x6e0f6c0] Opening 'http://.../chunklist_w222613001.m3u8' for reading [http @ 0x6e19dc0] HTTP error 404 Not Found [hls,applehttp @ 0x6e0f6c0] Failed to reload playlist 0 size= 36208kB time=00:37:49.95 bitrate= 130.7kbits/s speed= 1x video:0kB audio:35539kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.880420% I think this is incorrect because ffmpeg ended with an error, so it should return something other then 0. -- Ticket URL: <https://trac.ffmpeg.org/ticket/7804> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#7795(documentation:new): "(resp. decoding)" not clear
by FFmpeg 01 Apr '19

01 Apr '19

#7795: "(resp. decoding)" not clear -------------------------------------+------------------------------------- Reporter: jidanni | Type: | enhancement Status: new | Priority: minor Component: | Version: git- documentation | master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- On ffmpeg/manual/general.html {{{ X means that encoding (resp. decoding) is supported. }}} many users won't know what "(resp. decoding)" means, so perhaps use clearer English. Thanks. -- Ticket URL: <https://trac.ffmpeg.org/ticket/7795> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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Re: [FFmpeg-trac] #1261(swscale:open): yellowish color with resize and -pix_fmt pal8
by FFmpeg 01 Apr '19

01 Apr '19

#1261: yellowish color with resize and -pix_fmt pal8 ---------------------------------------+----------------------------------- Reporter: ami_stuff | Owner: Type: defect | Status: open Priority: normal | Component: swscale Version: git-master | Resolution: Keywords: swscale, pal8 | Blocked By: Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | ---------------------------------------+----------------------------------- Changes (by gdgsdg123): * Attachment "ffmpeg-20190401-103841.7z" added. -- Ticket URL: <https://trac.ffmpeg.org/ticket/1261> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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Re: [FFmpeg-trac] #1261(swscale:open): yellowish color with resize and -pix_fmt pal8
by FFmpeg 01 Apr '19

01 Apr '19

#1261: yellowish color with resize and -pix_fmt pal8 ---------------------------------------+----------------------------------- Reporter: ami_stuff | Owner: Type: defect | Status: open Priority: normal | Component: swscale Version: git-master | Resolution: Keywords: swscale, pal8 | Blocked By: Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | ---------------------------------------+----------------------------------- Changes (by gdgsdg123): * keywords: => swscale, pal8 Comment: Encountered similar situation when performing a different task... Build from: https://ffmpeg.zeranoe.com/builds/win64/static/win64/static/ffmpeg-20190330… {{{ ffmpeg started on 2019-04-01 at 10:38:41 Report written to "ffmpeg-20190401-103841.log" Command line: ffmpeg -report -i "C:\\Image-before-scaling.png" -pix_fmt pal8 -sws_flags bicubic+accurate_rnd -vf "scale=iw*2:ih*2" bicubic_text.png ffmpeg version N-93488-g52d8f35b14 Copyright (c) 2000-2019 the FFmpeg developers built with gcc 8.2.1 (GCC) 20190212 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable- fontconfig --enable-gnutls --enable-iconv --enable-libass --enable- libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable- libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable- nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt libavutil 56. 26.100 / 56. 26.100 libavcodec 58. 47.106 / 58. 47.106 libavformat 58. 26.101 / 58. 26.101 libavdevice 58. 7.100 / 58. 7.100 libavfilter 7. 48.100 / 7. 48.100 libswscale 5. 4.100 / 5. 4.100 libswresample 3. 4.100 / 3. 4.100 libpostproc 55. 4.100 / 55. 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 'C:\Image- before-scaling.png'. Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'pal8'. Reading option '-sws_flags' ... matched as AVOption 'sws_flags' with argument 'bicubic+accurate_rnd'. Reading option '-vf' ... matched as option 'vf' (set video filters) with argument 'scale=iw*2:ih*2'. Reading option 'bicubic_text.png' ... matched as output url. Finished splitting the commandline. Parsing a group of options: global . Applying option report (generate a report) with argument 1. Successfully parsed a group of options. Parsing a group of options: input url C:\Image-before-scaling.png. Successfully parsed a group of options. Opening an input file: C:\Image-before-scaling.png. [NULL @ 00000000004f1a80] Opening 'C:\Image-before-scaling.png' for reading [file @ 00000000004f3480] Setting default whitelist 'file,crypto' [png_pipe @ 00000000004f1a80] Format png_pipe probed with size=2048 and score=99 [png_pipe @ 00000000004f1a80] Before avformat_find_stream_info() pos: 0 bytes read:716 seeks:0 nb_streams:1 [png_pipe @ 00000000004f1a80] After avformat_find_stream_info() pos: 716 bytes read:716 seeks:0 frames:1 Input #0, png_pipe, from 'C:\Image-before-scaling.png': Duration: N/A, bitrate: N/A Stream #0:0, 1, 1/25: Video: png, pal8(pc), 109x40, 25 tbr, 25 tbn, 25 tbc Successfully opened the file. Parsing a group of options: output url bicubic_text.png. Applying option pix_fmt (set pixel format) with argument pal8. Applying option vf (set video filters) with argument scale=iw*2:ih*2. Successfully parsed a group of options. Opening an output file: bicubic_text.png. Successfully opened the file. detected 16 logical cores Stream mapping: Stream #0:0 -> #0:0 (png (native) -> png (native)) Press [q] to stop, [?] for help cur_dts is invalid (this is harmless if it occurs once at the start per stream) cur_dts is invalid (this is harmless if it occurs once at the start per stream) [Parsed_scale_0 @ 000000000296f000] Setting 'w' to value 'iw*2' [Parsed_scale_0 @ 000000000296f000] Setting 'h' to value 'ih*2' [Parsed_scale_0 @ 000000000296f000] Setting 'flags' to value 'bicubic' [Parsed_scale_0 @ 000000000296f000] Setting 'sws_flags' to value 'bicubic+accurate_rnd' [Parsed_scale_0 @ 000000000296f000] w:iw*2 h:ih*2 flags:'bicubic' interl:0 [graph 0 input from stream 0:0 @ 0000000002970300] Setting 'video_size' to value '109x40' [graph 0 input from stream 0:0 @ 0000000002970300] Setting 'pix_fmt' to value '11' [graph 0 input from stream 0:0 @ 0000000002970300] Setting 'time_base' to value '1/25' [graph 0 input from stream 0:0 @ 0000000002970300] Setting 'pixel_aspect' to value '0/1' [graph 0 input from stream 0:0 @ 0000000002970300] Setting 'sws_param' to value 'flags=2' [graph 0 input from stream 0:0 @ 0000000002970300] Setting 'frame_rate' to value '25/1' [graph 0 input from stream 0:0 @ 0000000002970300] w:109 h:40 pixfmt:pal8 tb:1/25 fr:25/1 sar:0/1 sws_param:flags=2 [format @ 000000000297a340] Setting 'pix_fmts' to value 'pal8' [AVFilterGraph @ 000000000296e9c0] query_formats: 4 queried, 3 merged, 0 already done, 0 delayed [swscaler @ 000000000297a840] Forcing full internal H chroma due to input having non subsampled chroma [Parsed_scale_0 @ 000000000296f000] w:109 h:40 fmt:pal8 sar:0/1 -> w:218 h:80 fmt:pal8 sar:0/1 flags:0x4 Output #0, image2, to 'bicubic_text.png': Metadata: encoder : Lavf58.26.101 Stream #0:0, 0, 1/25: Video: png, pal8, 218x80, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc Metadata: encoder : Lavc58.47.106 png Clipping frame in rate conversion by 0.000008 cur_dts is invalid (this is harmless if it occurs once at the start per stream) cur_dts is invalid (this is harmless if it occurs once at the start per stream) [out_0_0 @ 000000000297a180] EOF on sink link out_0_0:default. No more output streams to write to, finishing. [image2 @ 00000000004f35c0] Opening 'bicubic_text.png' for writing [file @ 000000000299dc00] Setting default whitelist 'file,crypto' [AVIOContext @ 000000000a500780] Statistics: 0 seeks, 1 writeouts frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A speed= 2.5x video:3kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown Input file #0 (C:\Image-before-scaling.png): Input stream #0:0 (video): 1 packets read (716 bytes); 1 frames decoded; Total: 1 packets (716 bytes) demuxed Output file #0 (bicubic_text.png): Output stream #0:0 (video): 1 frames encoded; 1 packets muxed (3380 bytes); Total: 1 packets (3380 bytes) muxed 1 frames successfully decoded, 0 decoding errors [AVIOContext @ 00000000004fb700] Statistics: 716 bytes read, 0 seeks }}} Files attached. Reference group from: https://en.wikipedia.org/wiki/Comparison_gallery_of_image_scaling_algorithms -- Ticket URL: <https://trac.ffmpeg.org/ticket/1261#comment:5> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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