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

Paul B Mahol onemda at gmail.com
Wed Aug 26 22:56:16 EEST 2020


On 8/25/20, Peter B. <pb at das-werkstatt.com> wrote:
> 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"?

That is only relevant for codecs that actually work only if parsers are enabled.
FFv1 is fairly simple codec, that does not need parser at all, and
solely depends
on muxer ability to store frames.

This is not first time somebody asking same/similar question.
I think that message is mostly useful only for developers.

>
>
>
> 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
>
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