[FFmpeg-user] MKV: parser not found for codec ffv1?

[Peter B.]

Hello everyone!

I've just received an FFprobe (version git-2019-12-29-e20c6d9) logfile 
that contained the following error message(s):

// -----------------------------------

[matroska,webm @ 00000000005b4940] Before avformat_find_stream_info() 
pos: 889 bytes read:32768 seeks:0 nb_streams:1
[matroska,webm @ 00000000005b4940] parser not found for codec ffv1, 
packets or times may be invalid.
[matroska,webm @ 00000000005b4940] parser not found for codec ffv1, 
packets or times may be invalid.
[matroska,webm @ 00000000005b4940] All info found
[matroska,webm @ 00000000005b4940] After avformat_find_stream_info() 
pos: 59402 bytes read:65536 seeks:0 frames:1

// -----------------------------------

I haven't seen the files myself, but they are said to work fine.


I would be very interested in more information about these messages. 
Especially regarding "parser not found for codec ffv1"?



Thank you very much in advance,
Peter B.



Complete commandline and (hopefully) uncut console output as follows:

// -----------------------------------
ffprobe started on 2020-08-25 at 15:14:58
Report written to "ffprobe-20200825-151458.log"
Log level: 48
Command line:
"C:\\ffmpeg\\bin\\ffprobe.exe" -i "G:\\TiFFTest\\test.mkv" -report
ffprobe version git-2019-12-29-e20c6d9 Copyright (c) 2007-2019 the 
FFmpeg developers
   built with gcc 9.2.1 (GCC) 20191125
   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-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc 
--enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt 
--enable-amf
   libavutil      56. 38.100 / 56. 38.100
   libavcodec     58. 65.100 / 58. 65.100
   libavformat    58. 35.101 / 58. 35.101
   libavdevice    58.  9.101 / 58.  9.101
   libavfilter     7. 70.100 /  7. 70.100
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
   libpostproc    55.  6.100 / 55.  6.100
[NULL @ 00000000005b4940] Opening 'G:\TiFFTest\test.mkv' for reading
[file @ 00000000005b5280] Setting default whitelist 'file,crypto'
[matroska,webm @ 00000000005b4940] Format matroska,webm probed with 
size=2048 and score=100
st:0 removing common factor 1000000 from timebase
[matroska,webm @ 00000000005b4940] Before avformat_find_stream_info() 
pos: 889 bytes read:32768 seeks:0 nb_streams:1
[matroska,webm @ 00000000005b4940] parser not found for codec ffv1, 
packets or times may be invalid.
[matroska,webm @ 00000000005b4940] parser not found for codec ffv1, 
packets or times may be invalid.
[matroska,webm @ 00000000005b4940] All info found
[matroska,webm @ 00000000005b4940] After avformat_find_stream_info() 
pos: 59402 bytes read:65536 seeks:0 frames:1
Input #0, matroska,webm, from 'G:\TiFFTest\test.mkv':
   Metadata:
     ENCODER         : Lavf58.35.101
   Duration: 00:00:55.32, start: 0.000000, bitrate: 67535 kb/s
     Stream #0:0, 1, 1/1000: Video: ffv1 (FFV1 / 0x31564646), bgra, 
720x576, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)
     Metadata:
       ENCODER         : Lavc58.65.100 ffv1
       DURATION        : 00:00:55.320000000
[AVIOContext @ 00000000005be540] Statistics: 65536 bytes read, 0 seeks