[FFmpeg-trac] #10454(undetermined:new): Unable to remux AV1 stream from MKV to MKV

[FFmpeg]

#10454: Unable to remux AV1 stream from MKV to MKV
--------------------------------------+----------------------------------
             Reporter:  mysterious    |                     Type:  defect
               Status:  new           |                 Priority:  normal
            Component:  undetermined  |                  Version:  6.0
             Keywords:                |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
--------------------------------------+----------------------------------
 Summary of the bug:

 With some MKV source files, copying the AV1 video stream to an MKV output
 results in effectively no video data in the output file.

 How to reproduce:

 Run the following command with the attached sample.mkv:

 ffmpeg -i sample.mkv -vcodec copy output.mkv

 Tested on ffmpeg 6.0.
 Output:

 {{{
 ffmpeg version 6.0-full_build-www.gyan.dev Copyright (c) 2000-2023 the
 FFmpeg developers
   built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
   configuration: --enable-gpl --enable-version3 --enable-static --disable-
 w32threads --disable-autodetect --enable-fontconfig --enable-iconv
 --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma
 --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt
 --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray
 --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d
 --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e
 --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265
 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl
 --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-
 libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-
 liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-
 amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec
 --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-
 libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-
 libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-
 libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora
 --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-
 libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex
 --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite
 --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-
 chromaprint
   libavutil      58.  2.100 / 58.  2.100
   libavcodec     60.  3.100 / 60.  3.100
   libavformat    60.  3.100 / 60.  3.100
   libavdevice    60.  1.100 / 60.  1.100
   libavfilter     9.  3.100 /  9.  3.100
   libswscale      7.  1.100 /  7.  1.100
   libswresample   4. 10.100 /  4. 10.100
   libpostproc    57.  1.100 / 57.  1.100
 [libdav1d @ 000001ba258d8600] libdav1d 1.1.0-3-g98b0c96
 Input #0, matroska,webm, from 'sample.mkv':
   Metadata:
     encoder         : libebml v1.4.4 + libmatroska v1.7.1
     creation_time   : 2023-07-08T07:38:01.000000Z
   Duration: 00:00:06.59, start: 0.000000, bitrate: 349 kb/s
   Stream #0:0: Video: av1 (Main), yuv420p10le(tv), 1920x1080, Film Grain,
 SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn (default)
     Metadata:
       BPS             : 340844
       DURATION        : 00:00:06.590000000
       NUMBER_OF_FRAMES: 158
       NUMBER_OF_BYTES : 280771
       _STATISTICS_WRITING_APP: mkvmerge v77.0 ('Elemental') 64-bit
       _STATISTICS_WRITING_DATE_UTC: 2023-07-08 07:38:01
       _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
 Output #0, matroska, to 'out.mkv':
   Metadata:
     encoder         : Lavf60.3.100
   Stream #0:0: Video: av1 (Main) (AV01 / 0x31305641), yuv420p10le(tv),
 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 23.98 fps, 23.98 tbr, 1k tbn
 (default)
     Metadata:
       BPS             : 340844
       DURATION        : 00:00:06.590000000
       NUMBER_OF_FRAMES: 158
       NUMBER_OF_BYTES : 280771
       _STATISTICS_WRITING_APP: mkvmerge v77.0 ('Elemental') 64-bit
       _STATISTICS_WRITING_DATE_UTC: 2023-07-08 07:38:01
       _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 frame=    0 fps=0.0 q=-1.0 Lsize=       1kB time=-577014:32:22.77
 bitrate=N/A speed=N/A    d=N/A
 video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 }}}

 Note the "video:0kB" output.

 Adding `-v debug` causes a bunch of "cur_dts is invalid" errors to be spat
 out, if that matters.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10454>
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