December 2021 - FFmpeg-trac - lists.ffmpeg.org

#8054(ffmpeg:new): prores_ks codec does not allow 12bit pix_fmt
by FFmpeg 21 Dec '24

21 Dec '24

#8054: prores_ks codec does not allow 12bit pix_fmt --------------------------------------+---------------------------------- Reporter: shaocaholica | Type: defect Status: new | Priority: normal Component: ffmpeg | Version: 4.1 Keywords: prores_ks | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | --------------------------------------+---------------------------------- Summary of the bug: Apple prores4444XQ which is supported by prores_ks allows for 12bit RGB/YUV channels but when a 12bit pix_fmt is used a warning is given: {{{ Incompatible pixel format 'yuv444p12le' for codec 'prores_ks', auto- selecting format 'yuv444p10le' }}} How to reproduce: {{{ % ffmpeg -f image2 -r 24.0 -i sample_16bit.%4d.tif -c:v prores_ks -profile:v 5 -pix_fmt yuv444p12le -vf colormatrix=bt601:bt709 prores4444XQ.mov ffmpeg version 4.1-static https://johnvansickle.com/ffmpeg/ built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516 }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/8054> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#5083(avcodec:new): Conversion from yuv410p to rgb24 looks wrong
by FFmpeg 21 Dec '24

21 Dec '24

#5083: Conversion from yuv410p to rgb24 looks wrong ---------------------------------+-------------------------------------- Reporter: khali | Type: defect Status: new | Priority: normal Component: avcodec | Version: git-master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ---------------------------------+-------------------------------------- Summary of the bug: When generating still pictures from a yuv410p video stream in PNG or BMP format, the output looks incorrect. The same still pictures written as TIFF or JPEG pictures look right. Given that TIFF and JPEG store the data in YUV color space while PNG and BMP use the RGB color space, this makes me suspect that the conversion from yuv410p to rgb24 is broken. How to reproduce: {{{ % ffmpeg -f lavfi -i "color=color=white:size=16x16" -frames:v 1 -vf "format=yuv410p,drawbox=color=red:x=4:y=4:w=8:h=8" -f image2 410p.png ffmpeg version N-77180-g45938f0 Copyright (c) 2000-2015 the FFmpeg developers built with gcc 4.8 (SUSE Linux) configuration: --prefix=/opt/ffmpeg --enable-shared --enable-libmp3lame --enable-libxvid --enable-postproc --enable-gpl --enable-x11grab --enable- avfilter --enable-version3 --enable-libx264 --enable-pthreads --enable- libvorbis --enable-libtheora --enable-fontconfig --cpu=corei7 --enable- libfaac --enable-nonfree libavutil 55. 10.100 / 55. 10.100 libavcodec 57. 17.100 / 57. 17.100 libavformat 57. 19.100 / 57. 19.100 libavdevice 57. 0.100 / 57. 0.100 libavfilter 6. 20.100 / 6. 20.100 libswscale 4. 0.100 / 4. 0.100 libswresample 2. 0.101 / 2. 0.101 libpostproc 54. 0.100 / 54. 0.100 Input #0, lavfi, from 'color=color=white:size=16x16': Duration: N/A, start: 0.000000, bitrate: N/A Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 16x16 [SAR 1:1 DAR 1:1], 25 tbr, 25 tbn, 25 tbc Output #0, image2, to '410p.png': Metadata: encoder : Lavf57.19.100 Stream #0:0: Video: png, rgb24, 16x16 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc Metadata: encoder : Lavc57.17.100 png Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> png (native)) Press [q] to stop, [?] for help [swscaler @ 0x1b9f4c0] Warning: data is not aligned! This can lead to a speedloss frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown }}} The generated image file does not look good. While the generated pattern is fully symmetric, the output image is not. Same problem with 410p.bmp as the output. However both 410p.jpg and 410p.tiff look right. Also note that format=yuv420p and format=yuv411p both work properly. So this is not a generic problem with the YUV to RGB color space conversion, rather this seems to be specifically related to yuv410p. Converting from yuv410p to yuv420p seems to also be broken, but differently. See how {{{ % ffmpeg -f lavfi -i "color=color=white:size=16x16" -frames:v 1 -vf "format=yuv410p,drawbox=color=red:x=4:y=4:w=8:h=8,format=yuv420p" -f image2 410p_to_420p.tiff }}} manages to create green pixels from a picture that originally only had white and red. -- Ticket URL: <https://trac.ffmpeg.org/ticket/5083> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#8871(swscale:new): swsscale crops image on yuv2rgb
by FFmpeg 17 Dec '24

17 Dec '24

#8871: swsscale crops image on yuv2rgb ---------------------------------+--------------------------------------- Reporter: xlp | Type: defect Status: new | Priority: normal Component: swscale | Version: unspecified Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ---------------------------------+--------------------------------------- Summary of the bug: swscale leaves a small right portion of the image out on yuv2rgb conversion. aka "crops it", so a bar of the destination-image on right side stays unwritten. this seems to effect only certain resolutions/linesizes - below is one given that seems to cause issues How to reproduce: {{{ // HAS NO ISSUES // int32_t width = 1600; // int32_t height = 900; // int srcLinesize[8] = {1664, 832, 832, 0, 0, 0, 0, 0}; // HAS ISSUES int32_t width = 1220; int32_t height = 1200; int srcLinesize[8] = {1280, 640, 640, 0, 0, 0, 0, 0}; struct SwsContext* sws_scaler_ctx = sws_getContext(width, height, AV_PIX_FMT_YUV420P, width, height, AV_PIX_FMT_RGB0, SWS_FAST_BILINEAR, 0, 0, 0); size_t destBufferSize = width * 4 * height; uint8_t* destBuffer = (uint8_t*) malloc(destBufferSize); memset(destBuffer, 0x00, destBufferSize); uint8_t* destLines[4] = {destBuffer, 0, 0, 0}; int destData[4] = {width * 4, 0, 0, 0}; // Make a dummy source with green footage uint8_t* srcData[8]; for (int i = 0; i < 8; i++) { if (srcLinesize[i] > 0) { size_t srcBufferSize = srcLinesize[i]*height; srcData[i] = (uint8_t*) malloc(srcBufferSize); memset(srcData[i], 0x00, srcBufferSize); } else { srcData[i] = 0x00; } } sws_scale(sws_scaler_ctx, (const uint8_t* const*)srcData, srcLinesize, 0, height, destLines, destData); }}} Produced Result: Green area with unwritten gap at the right side (here in the size of 4x1200) Expected result: Completely green area, as the provided YUV source contains -- Ticket URL: <https://trac.ffmpeg.org/ticket/8871> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#4444(swscale:new): Transparency gets lost when scaling pal8
by FFmpeg 16 Dec '24

16 Dec '24

#4444: Transparency gets lost when scaling pal8 --------------------------------------+------------------------------------ Reporter: cehoyos | Owner: Type: defect | Status: new Priority: normal | Component: swscale Version: git-master | Keywords: pal8 alpha Blocked By: | Blocking: Reproduced by developer: 0 | Analyzed by developer: 0 --------------------------------------+------------------------------------ {{{ $ ffmpeg -i alpha.png -s 168x168 out.png ffmpeg version N-71320-gc4b2017 Copyright (c) 2000-2015 the FFmpeg developers built with gcc 4.7 (SUSE Linux) configuration: --enable-gpl libavutil 54. 22.100 / 54. 22.100 libavcodec 56. 34.100 / 56. 34.100 libavformat 56. 29.100 / 56. 29.100 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 13.101 / 5. 13.101 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 3.100 / 53. 3.100 Input #0, png_pipe, from 'alpha.png': Duration: N/A, bitrate: N/A Stream #0:0: Video: png, pal8, 21x21 [SAR 5:6 DAR 5:6], 25 tbr, 25 tbn, 25 tbc Output #0, apng, to 'out.png': Metadata: encoder : Lavf56.29.100 Stream #0:0: Video: apng, pal8, 168x168 [SAR 5:6 DAR 5:6], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc Metadata: encoder : Lavc56.34.100 apng Stream mapping: Stream #0:0 -> #0:0 (png (native) -> apng (native)) Press [q] to stop, [?] for help [apng @ 0x36fd040] Only a single frame so saving as a normal PNG. frame= 1 fps=0.0 q=0.0 Lsize= 4kB time=00:00:00.04 bitrate= 823.4kbits/s video:3kB audio:0kB subtitle:0kB other streams:0kB global headers:1kB muxing overhead: 24.418253% }}} The output file is opaque. -- Ticket URL: <https://trac.ffmpeg.org/ticket/4444> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#8496(swscale:new): Conditional jump or move depends on uninitialised value with small input
by FFmpeg 16 Dec '24

16 Dec '24

#8496: Conditional jump or move depends on uninitialised value with small input --------------------------------------+--------------------------------- Reporter: ubitux | Owner: Type: defect | Status: new Priority: important | Component: swscale Version: git-master | Keywords: Blocked By: | Blocking: Reproduced by developer: 0 | Analyzed by developer: 0 --------------------------------------+--------------------------------- {{{ ☭ valgrind ./ffmpeg_g -f lavfi -i color=white:s=2x2,format=rgba,scale=10x10 -frames:v 1 -f null - ==95117== Memcheck, a memory error detector ==95117== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al. ==95117== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info ==95117== Command: ./ffmpeg_g -f lavfi -i color=white:s=2x2,format=rgba,scale=10x10 -frames:v 1 -f null - ==95117== ffmpeg version N-96482-ge931119a41 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 9.2.0 (GCC) configuration: --cc=/usr/bin/gcc libavutil 56. 38.100 / 56. 38.100 libavcodec 58. 66.100 / 58. 66.100 libavformat 58. 35.104 / 58. 35.104 libavdevice 58. 9.103 / 58. 9.103 libavfilter 7. 71.100 / 7. 71.100 libswscale 5. 6.100 / 5. 6.100 libswresample 3. 6.100 / 3. 6.100 ==95117== Conditional jump or move depends on uninitialised value(s) ==95117== at 0xF25462: yuv2rgb_full_1_c_template (output.c:2102) ==95117== by 0xF25462: yuv2rgba32_full_1_c (output.c:2142) ==95117== by 0xF05B31: packed_vscale (vscale.c:134) ==95117== by 0xF01D20: swscale (swscale.c:503) ==95117== by 0xF02D5C: sws_scale (swscale.c:978) ==95117== by 0x3A5496: scale_slice.isra.0 (vf_scale.c:647) ==95117== by 0x3A5C76: scale_frame (vf_scale.c:809) ==95117== by 0x3A5D77: filter_frame (vf_scale.c:823) ==95117== by 0x2C85FC: ff_filter_frame_framed (avfilter.c:1066) ==95117== by 0x2C85FC: ff_filter_frame_to_filter (avfilter.c:1214) ==95117== by 0x2C85FC: ff_filter_activate_default (avfilter.c:1263) ==95117== by 0x2C85FC: ff_filter_activate (avfilter.c:1425) ==95117== by 0x2CBC1C: get_frame_internal (buffersink.c:108) ==95117== by 0x2A6917: lavfi_read_packet (lavfi.c:412) ==95117== by 0x5AEB2E: ff_read_packet (utils.c:857) ==95117== by 0x5AF4AA: read_frame_internal (utils.c:1588) ==95117== Input #0, lavfi, from 'color=white:s=2x2,format=rgba,scale=10x10': Duration: N/A, start: 0.000000, bitrate: N/A Stream #0:0: Video: rawvideo (RGBA / 0x41424752), rgba, 10x10 [SAR 1:1 DAR 1:1], 25 tbr, 25 tbn, 25 tbc Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> wrapped_avframe (native)) Press [q] to stop, [?] for help Output #0, null, to 'pipe:': Metadata: encoder : Lavf58.35.104 Stream #0:0: Video: wrapped_avframe, rgba, 10x10 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc Metadata: encoder : Lavc58.66.100 wrapped_avframe frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=0.113x video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown ==95117== ==95117== HEAP SUMMARY: ==95117== in use at exit: 0 bytes in 0 blocks ==95117== total heap usage: 2,725 allocs, 2,725 frees, 926,979 bytes allocated ==95117== ==95117== All heap blocks were freed -- no leaks are possible ==95117== ==95117== Use --track-origins=yes to see where uninitialised values come from ==95117== For lists of detected and suppressed errors, rerun with: -s ==95117== ERROR SUMMARY: 100 errors from 1 contexts (suppressed: 0 from 0) }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/8496> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#7155(ffmpeg:new): Add option to stop writing at position relative to EOF
by FFmpeg 16 Dec '24

16 Dec '24

#7155: Add option to stop writing at position relative to EOF ----------------------------------+--------------------------------------- Reporter: clone206 | Type: enhancement Status: new | Priority: wish Component: ffmpeg | Version: 3.4 Keywords: seek | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ----------------------------------+--------------------------------------- Summary of the bug: Feature request How to reproduce: N/A Add main option to allow stopping of writing to output at position relative to "end of file", where 0 is eof, and negative values are earlier in the file. Proposed switch: "-toeof", like "-sseof" but for stopping point instead of beginning point. Background: I have ripped SACD audio tracks with extraneous loud noises at the last few hundred milliseconds of each track, and want to chop off that duration from the end of each file as part of a batch process. I would like to do something like the following on each file: ffmpeg -i input.flac -toeof -00:00:00.9 output.flac -- Ticket URL: <https://trac.ffmpeg.org/ticket/7155> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#6690(avformat:new): Raw Electronic Arts ADPCM support
by FFmpeg 09 Dec '24

09 Dec '24

#6690: Raw Electronic Arts ADPCM support ----------------------------------+--------------------------------------- Reporter: koops | Type: enhancement Status: new | Priority: normal Component: avformat | Version: unspecified Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ----------------------------------+--------------------------------------- Summary of the bug: How to reproduce: {{{ $ ffmpeg -i sound.XA sound.wav sound.XA: Invalid data found when processing input }}} I would like support for headerless Electronic Arts ADPCM files to be added. These files are common in some Electronic Arts games, like Harry Potter and the Chamber of Secrets and Brother Bear. The format is similar to adpcm_ea_r1, but the file is always mono, there is no channels header. ADPCM history is always initialized to [0, 0]. File size is always a multiple of 15, there is no raw sample mode (0xEE). Sample rate is 22050Hz by default. Files can be encoded into this format using sx.exe: {{{ > sx -raw -eaxa_blk sample.wav -=sample.XA }} I attached a test case, a XA file and the corresponding decoded raw file. This is decoder code in C# (I release it under CC0): {{{ using System; using System.IO; using System.Text; namespace KoopsAudioDecoder { class Program { static int coeff1, coeff2, shift, adpcmHistory1 = 0, adpcmHistory2 = 0; static readonly int[] EA_XA_TABLE = new int[] { 0, 0, 240, 0, 460, -208, 392, -220, }; static void DecodeSingleFrame(BinaryReader stream, BinaryWriter outbuf) { int frameInfo = stream.ReadByte(); coeff1 = EA_XA_TABLE[((frameInfo >> 4) & 15) << 1]; coeff2 = EA_XA_TABLE[(((frameInfo >> 4) & 15) << 1) + 1]; shift = (frameInfo & 15) + 8; for (int i = 0; i < 14; i++) { int sample_byte = stream.ReadByte(); int[] nibbles = { sample_byte >> 4, sample_byte & 15 }; foreach (int nibble in nibbles) { int sample = GetSample(nibble); outbuf.Write(Clamp16(sample)); } } } private static int GetSample(int nibble) { int sample = (nibble << 28 >> shift) + (coeff1 * adpcmHistory1) + (coeff2 * adpcmHistory2) >> 8; adpcmHistory2 = adpcmHistory1; adpcmHistory1 = sample; return sample; } static private short Clamp16(int sample) { if (sample > 32767) { return 32767; } else if (sample < -32768) { return -32768; } else { return (short) sample; } } static int Main(string[] args) { if (args.Length != 1) { Console.WriteLine("This program takes only one argument, input file"); return 1; } string inputFileName = args[0], outputFileName = Path.ChangeExtension(inputFileName, "raw"); Stream inputFile = File.OpenRead(inputFileName), outputFile = File.OpenWrite(outputFileName); BinaryReader inputFileReader = new BinaryReader(inputFile); BinaryWriter outputFileWriter = new BinaryWriter(outputFile); while (inputFile.Length - inputFile.Position >= 15) { DecodeSingleFrame(inputFileReader, outputFileWriter); } if (inputFile.Length - inputFile.Position > 0) { Console.WriteLine("File has {0} spare bytes.", inputFile.Length - inputFile.Position); } return 0; } } } }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/6690> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#7799(avcodec:new): hevc_mp4toannexb filter inserts extradata wrong position
by FFmpeg 07 Dec '24

07 Dec '24

#7799: hevc_mp4toannexb filter inserts extradata wrong position ---------------------------------+--------------------------------------- Reporter: gudbooy | Type: defect Status: new | Priority: normal Component: avcodec | Version: unspecified Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ---------------------------------+--------------------------------------- Summary of the bug: After applied hevc_mp4toannexb filter to the attached video (refer to the below link), the frames become broken from the video players (e.g. VLC, ffplay) The problem is caused by prepending the extra-data to IRAP frames in libavcodec/hevc_mp4toannexb_bsf.c. This video contains own vps/sps/pps for every IRAP frames. The extradata from hevcc is slightly different from every IRAP frames have (in this case QP value is different) and the hevc_mp4toannexb filter prepends the different extradata to every IRAP frames, causing the broken frames. Video File Repo : https://www.dropbox.com/s/tpyohk6vf096zxm/hevc_after_mp4toannexb_conversion… I am afraid that I can't connect to ftp://upload.ffmpeg.org, so I just attached to the dropbox url How to reproduce: {{{ % ffmpeg -i hevc_after_mp4toannexb_conversion_qp_value_modified.mp4 -codec copy -bsf:v hevc_mp4toannexb output.hevc $vlc output.hevc }}} Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker. -- Ticket URL: <https://trac.ffmpeg.org/ticket/7799> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#6207(avformat:new): Wrong mkv codec ID for ac3 with bitstream_id > 8
by FFmpeg 07 Dec '24

07 Dec '24

#6207: Wrong mkv codec ID for ac3 with bitstream_id > 8 --------------------------------------+---------------------------------- Reporter: cehoyos | Owner: Type: defect | Status: new Priority: normal | Component: avformat Version: git-master | Keywords: mkv ac3 Blocked By: | Blocking: Reproduced by developer: 0 | Analyzed by developer: 0 --------------------------------------+---------------------------------- I will attached two mkv samples with codec ID A_AC3/BSID9 and A_AC3/BSID10 that get an incorrect codec ID A_AC3 when remuxed with FFmpeg. {{{ $ ffmpeg -i ac3bsid9.mkv -acodec copy out.mkv ffmpeg version N-83691-g7f62368 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 4.7 (SUSE Linux) configuration: --enable-gpl libavutil 55. 47.100 / 55. 47.100 libavcodec 57. 81.100 / 57. 81.100 libavformat 57. 66.102 / 57. 66.102 libavdevice 57. 3.100 / 57. 3.100 libavfilter 6. 74.100 / 6. 74.100 libswscale 4. 3.101 / 4. 3.101 libswresample 2. 4.100 / 2. 4.100 libpostproc 54. 2.100 / 54. 2.100 Input #0, matroska,webm, from 'ac3bsid9.mkv': Metadata: encoder : libebml v1.3.4 + libmatroska v1.4.5 creation_time : 2017-02-28T20:08:32.000000Z Duration: 00:00:01.02, start: 0.000000, bitrate: 141 kb/s Stream #0:0: Audio: ac3, 24000 Hz, mono, fltp, 96 kb/s (default) Metadata: BPS : 96000 BPS-eng : 96000 DURATION : 00:00:01.024000705 DURATION-eng : 00:00:01.024000705 NUMBER_OF_FRAMES: 16 NUMBER_OF_FRAMES-eng: 16 NUMBER_OF_BYTES : 12288 NUMBER_OF_BYTES-eng: 12288 _STATISTICS_WRITING_APP: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_APP-eng: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_DATE_UTC: 2017-02-28 20:08:32 _STATISTICS_WRITING_DATE_UTC-eng: 2017-02-28 20:08:32 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES Output #0, matroska, to 'out.mkv': Metadata: encoder : Lavf57.66.102 Stream #0:0: Audio: ac3 ([0] [0][0] / 0x2000), 24000 Hz, mono, fltp, 96 kb/s (default) Metadata: BPS : 96000 BPS-eng : 96000 DURATION : 00:00:01.024000705 DURATION-eng : 00:00:01.024000705 NUMBER_OF_FRAMES: 16 NUMBER_OF_FRAMES-eng: 16 NUMBER_OF_BYTES : 12288 NUMBER_OF_BYTES-eng: 12288 _STATISTICS_WRITING_APP: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_APP-eng: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_DATE_UTC: 2017-02-28 20:08:32 _STATISTICS_WRITING_DATE_UTC-eng: 2017-02-28 20:08:32 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES Stream mapping: Stream #0:0 -> #0:0 (copy) Press [q] to stop, [?] for help size= 13kB time=00:00:00.96 bitrate= 114.5kbits/s speed=3.69e+03x video:0kB audio:12kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 11.832683% }}} {{{ $ ffmpeg -i ac3bsid10.mkv -acodec copy out.mkv ffmpeg version N-83691-g7f62368 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 4.7 (SUSE Linux) configuration: --enable-gpl libavutil 55. 47.100 / 55. 47.100 libavcodec 57. 81.100 / 57. 81.100 libavformat 57. 66.102 / 57. 66.102 libavdevice 57. 3.100 / 57. 3.100 libavfilter 6. 74.100 / 6. 74.100 libswscale 4. 3.101 / 4. 3.101 libswresample 2. 4.100 / 2. 4.100 libpostproc 54. 2.100 / 54. 2.100 Input #0, matroska,webm, from 'ac3bsid10.mkv': Metadata: encoder : libebml v1.3.4 + libmatroska v1.4.5 creation_time : 2017-02-28T20:08:01.000000Z Duration: 00:00:01.15, start: 0.000000, bitrate: 136 kb/s Stream #0:0: Audio: ac3, 8000 Hz, mono, fltp, 96 kb/s (default) Metadata: BPS : 96083 BPS-eng : 96083 DURATION : 00:00:01.151990784 DURATION-eng : 00:00:01.151990784 NUMBER_OF_FRAMES: 6 NUMBER_OF_FRAMES-eng: 6 NUMBER_OF_BYTES : 13824 NUMBER_OF_BYTES-eng: 13824 _STATISTICS_WRITING_APP: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_APP-eng: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_DATE_UTC: 2017-02-28 20:08:01 _STATISTICS_WRITING_DATE_UTC-eng: 2017-02-28 20:08:01 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES Output #0, matroska, to 'out.mkv': Metadata: encoder : Lavf57.66.102 Stream #0:0: Audio: ac3 ([0] [0][0] / 0x2000), 8000 Hz, mono, fltp, 96 kb/s (default) Metadata: BPS : 96083 BPS-eng : 96083 DURATION : 00:00:01.151990784 DURATION-eng : 00:00:01.151990784 NUMBER_OF_FRAMES: 6 NUMBER_OF_FRAMES-eng: 6 NUMBER_OF_BYTES : 13824 NUMBER_OF_BYTES-eng: 13824 _STATISTICS_WRITING_APP: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_APP-eng: mkvmerge v9.8.0 ('Kuglblids') 64bit _STATISTICS_WRITING_DATE_UTC: 2017-02-28 20:08:01 _STATISTICS_WRITING_DATE_UTC-eng: 2017-02-28 20:08:01 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES Stream mapping: Stream #0:0 -> #0:0 (copy) Press [q] to stop, [?] for help size= 15kB time=00:00:00.96 bitrate= 126.7kbits/s speed=5.03e+03x video:0kB audio:14kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 9.997107% }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/6207> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#9428(avcodec:new): avcodec: truehd parser drops data but does not adjust initial timestamps
by FFmpeg 02 Dec '24

02 Dec '24

#9428: avcodec: truehd parser drops data but does not adjust initial timestamps ---------------------------------+-------------------------------------- Reporter: jeeb | Type: defect Status: new | Priority: normal Component: avcodec | Version: git-master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ---------------------------------+-------------------------------------- Summary of the bug: 1. The TrueHD parser does drop data received until sync with first random access point packet is received. 2. The parser framework seems to be oblivious to this, and sticks the first received buffer's dts/pts on the received data. How to reproduce: The bug is easily reproducible with a Matroska sample that starts with non-random access point TrueHD packets, as the demuxer itself requests parsing for TrueHD and MLP. This can be reproduced by just utilizing the parsing API by itself as well with av_parser_parse2, as this is how I noticed the issue originally. {{{ % ffprobe -of json -show_packets -show_frames -i http://www.cccp- project.net/beta/test_files/mzero_truehd_sample.mkv }}} {{{ { "packets_and_frames": [ { "type": "packet", "codec_type": "audio", "stream_index": 1, "pts": 0, "pts_time": "0.000000", "dts": 0, "dts_time": "0.000000", "size": "324", "pos": "501277", "flags": "K_" }, { "type": "frame", "media_type": "audio", "stream_index": 1, "key_frame": 1, "pts": 0, "pts_time": "0.000000", "pkt_dts": 0, "pkt_dts_time": "0.000000", "best_effort_timestamp": 0, "best_effort_timestamp_time": "0.000000", "pkt_pos": "501277", "pkt_size": "324", "sample_fmt": "s32", "nb_samples": 40, "channels": 6, "channel_layout": "5.1(side)", "side_data_list": [ { "side_data_type": "AVMatrixEncoding" } ] }, { "type": "packet", "codec_type": "audio", "stream_index": 1, "pts": 93, "pts_time": "0.093000", "dts": 93, "dts_time": "0.093000", "size": "132", "pos": "559062", "flags": "__" }, { "type": "frame", "media_type": "audio", "stream_index": 1, "key_frame": 1, "pts": 93, "pts_time": "0.093000", "pkt_dts": 93, "pkt_dts_time": "0.093000", "best_effort_timestamp": 93, "best_effort_timestamp_time": "0.093000", "pkt_pos": "559062", "pkt_size": "132", "sample_fmt": "s32", "nb_samples": 40, "channels": 6, "channel_layout": "5.1(side)", "side_data_list": [ { "side_data_type": "AVMatrixEncoding" } ] } ] } }}} The first received packet (324 bytes, random access point) came from a Matroska SimpleBlock with the pts=0.092. Yet since most likely the parser framework didn't get notified that the input got dropped until then, you will get the timestamps of when the feeding started. The following buffers will get the right timestamps, as seen by the pts=0.093. I did start looking into this, but unfortunately was not able to focus on it, and decided to file this issue so that it is known by others than just me. -- Ticket URL: <https://trac.ffmpeg.org/ticket/9428> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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