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  1. Briefing

    I have some .wmv files (actually, my full batch file deals with multiple filetypes) with weird data streams that are needed for an external program to recognize them.

    I'm trying to remove every stream that is not data or audio, which also needs to be reencoded.

    The minimal command I'm using for what I'm discussing is

    Code:
    fmpeg -y -loglevel debug -flags global_header -err_detect ignore_err -fflags +igndts -copy_unknown -i "input.wmv" -f asf -c copy -map 0 -vn -sn -b:a 32k "output.wmv"
    Which works for other file types with the same type of data stream and will work with .wmv if I add "-dn" (even though my file is then not recognizable by the external program). The command above, as is, for .wmv files will output the error "Could not write header for output file #0 (incorrect codec parameters ?): Operation not permitted".

    From FFprobe (full output below), I can see the message "Unsupported codec with id 0 for input stream 2", so I believe it's beyond doubt that the cause is indeed the data stream.

    ---

    Question

    The thing is that I expected "-copy_unknown" to deal with this and it doesn't. My question is: how do I copy this unsupported, not used anywhere else data stream? Are there other ways to approach the matter?

    Thanks

    ---

    Extra info

    Full FFmpeg output (with "-loglevel debug"):


    Code:
    ffmpeg version 4.2 Copyright (c) 2000-2019 the FFmpeg developers
      built with gcc 9.1.1 (GCC) 20190807
      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. 31.100 / 56. 31.100
      libavcodec     58. 54.100 / 58. 54.100
      libavformat    58. 29.100 / 58. 29.100
      libavdevice    58.  8.100 / 58.  8.100
      libavfilter     7. 57.100 /  7. 57.100
      libswscale      5.  5.100 /  5.  5.100
      libswresample   3.  5.100 /  3.  5.100
      libpostproc    55.  5.100 / 55.  5.100
    Splitting the commandline.
    Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
    Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
    Reading option '-flags' ... matched as AVOption 'flags' with argument 'global_header'.
    Reading option '-err_detect' ...Routing option err_detect to both codec and muxer layer
     matched as AVOption 'err_detect' with argument 'ignore_err'.
    Reading option '-fflags' ... matched as AVOption 'fflags' with argument '+igndts'.
    Reading option '-copy_unknown' ... matched as option 'copy_unknown' (Copy unknown stream types) with argument '1'.
    Reading option '-i' ... matched as input url with argument 'C:\Users\Fabio\Desktop\Testes\test\a.wmv'.
    Reading option '-f' ... matched as option 'f' (force format) with argument 'asf'.
    Reading option '-c' ... matched as option 'c' (codec name) with argument 'copy'.
    Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '0'.
    Reading option '-vn' ... matched as option 'vn' (disable video) with argument '1'.
    Reading option '-sn' ... matched as option 'sn' (disable subtitle) with argument '1'.
    Reading option '-b:a' ... matched as option 'b' (video bitrate (please use -b:v)) with argument '32k'.
    Reading option '\Users\Fabio\Desktop\Testes\test\a.wmv.tmpoutput' ... matched as output url.
    Finished splitting the commandline.
    Parsing a group of options: global .
    Applying option y (overwrite output files) with argument 1.
    Applying option loglevel (set logging level) with argument debug.
    Applying option copy_unknown (Copy unknown stream types) with argument 1.
    Successfully parsed a group of options.
    Parsing a group of options: input url C:\Users\Fabio\Desktop\Testes\test\a.wmv.
    Successfully parsed a group of options.
    Opening an input file: C:\Users\Fabio\Desktop\Testes\test\a.wmv.
    [NULL @ 0000025955e7af40] Opening 'C:\Users\Fabio\Desktop\Testes\test\a.wmv' for reading
    [file @ 0000025955e7b740] Setting default whitelist 'file,crypto'
    [asf @ 0000025955e7af40] Format asf probed with size=2048 and score=100
    [asf @ 0000025955e7af40] gpos mismatch our pos=24, end=244
    [asf @ 0000025955e7af40] gpos mismatch our pos=24, end=26
    [asf @ 0000025955e7af40] gpos mismatch our pos=24, end=3295
    [asf @ 0000025955e7af40] Payload extension 50 2
    [asf @ 0000025955e7af40] gpos mismatch our pos=24, end=42
    [asf @ 0000025955e7af40] gpos mismatch our pos=24, end=44
    [asf @ 0000025955e7af40] gpos mismatch our pos=24, end=834
    [asf @ 0000025955e7af40] Before avformat_find_stream_info() pos: 5793 bytes read:32768 seeks:0 nb_streams:3
    [asf @ 0000025955e7af40] parser not found for codec wmav2, packets or times may be invalid.
    [wmv3 @ 0000025955eb4480] Header: 46690A01
    [wmv3 @ 0000025955eb4480] Profile 1:
    frmrtq_postproc=3, bitrtq_postproc=6
    LoopFilter=1, MultiRes=0, FastUVMC=0, Extended MV=0
    Rangered=0, VSTransform=1, Overlap=1, SyncMarker=0
    DQuant=0, Quantizer mode=0, Max B-frames=0
    [wmv3 @ 0000025955eb4480] Extra data: 8 bits left, value: 0
    [wmv3 @ 0000025955eb4480] Format yuv420p chosen by get_format().
        Last message repeated 1 times
    [asf @ 0000025955e7af40] parser not found for codec wmav2, packets or times may be invalid.
    [asf @ 0000025955e7af40] All info found
    [asf @ 0000025955e7af40] After avformat_find_stream_info() pos: 191671 bytes read:196608 seeks:0 frames:58
    Guessed Channel Layout for Input Stream #0.0 : stereo
    Input #0, asf, from 'C:\Users\Fabio\Desktop\Testes\test\a.wmv':
      Metadata:
        copyright       : ChessBase GmbH
        WMFSDKVersion   : 12.0.9600.17415
        WMFSDKNeeded    : 0.0.0.0000
        IsVBR           : 0
        DeviceConformanceTemplate: MP@ML
      Duration: 00:00:23.08, start: 0.000000, bitrate: 526 kb/s
        Stream #0:0, 17, 1/1000: Audio: wmav2 (a[1][0][0] / 0x0161), 48000 Hz, stereo, fltp, 96 kb/s
        Stream #0:1, 41, 1/1000: Video: wmv3 (Main), 1 reference frame (WMV3 / 0x33564D57), yuv420p(left), 640x480, 0/1, 415 kb/s, 25 tbr, 1k tbn, 1k tbc
        Stream #0:2, 0, 1/1000: Data: none, 0/1, 10 kb/s
    Successfully opened the file.
    Parsing a group of options: output url \Users\Fabio\Desktop\Testes\test\a.wmv.tmpoutput.
    Applying option f (force format) with argument asf.
    Applying option c (codec name) with argument copy.
    Applying option map (set input stream mapping) with argument 0.
    Applying option vn (disable video) with argument 1.
    Applying option sn (disable subtitle) with argument 1.
    Applying option b:a (video bitrate (please use -b:v)) with argument 32k.
    Successfully parsed a group of options.
    Opening an output file: \Users\Fabio\Desktop\Testes\test\a.wmv.tmpoutput.
    [file @ 0000025955eee200] Setting default whitelist 'file,crypto'
    Successfully opened the file.
    Could not write header for output file #0 (incorrect codec parameters ?): Operation not permitted
    Stream mapping:
      Stream #0:0 -> #0:0 (copy)
      Stream #0:2 -> #0:1 (copy)
        Last message repeated 1 times
    [AVIOContext @ 0000025955eee2c0] Statistics: 0 seeks, 1 writeouts
    [AVIOContext @ 0000025955e83980] Statistics: 196608 bytes read, 0 seeks
    FFprobe on a sample file:

    Code:
    ffprobe version 4.3 Copyright (c) 2007-2020 the FFmpeg developers
      built with gcc 9.3.1 (GCC) 20200621
      configuration: --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-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-libopenmpt --enable-amf
      libavutil      56. 51.100 / 56. 51.100
      libavcodec     58. 91.100 / 58. 91.100
      libavformat    58. 45.100 / 58. 45.100
      libavdevice    58. 10.100 / 58. 10.100
      libavfilter     7. 85.100 /  7. 85.100
      libswscale      5.  7.100 /  5.  7.100
      libswresample   3.  7.100 /  3.  7.100
    [wmv3 @ 00000180012e1440] Extra data: 8 bits left, value: 0
    Input #0, asf, from 'test/a.wmv':
      Metadata:
    
        WMFSDKVersion   : 12.0.9600.17415
        WMFSDKNeeded    : 0.0.0.0000
        IsVBR           : 0
        DeviceConformanceTemplate: MP@ML
      Duration: 00:00:23.08, start: 0.000000, bitrate: 526 kb/s
        Stream #0:0: Audio: wmav2 (a[1][0][0] / 0x0161), 48000 Hz, 2 channels, fltp, 96 kb/s
        Stream #0:1: Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 640x480, 415 kb/s, 25 tbr, 1k tbn, 1k tbc
        Stream #0:2: Data: none, 10 kb/s
    [wmv3 @ 0000018001324a80] Extra data: 8 bits left, value: 0
    Unsupported codec with id 0 for input stream 2
    ---

    Other

    I chose to specify "-f" to facilitate other non-related parts of my flow.
    Quote Quote  
  2. Perhaps a little less cryptic description might help but anyway try to export to mkv first, works for me witch dvb-teletext.
    Last edited by Bonnevue; 12th Jul 2020 at 02:32. Reason: made a typo
    Quote Quote  
  3. I'm sorry, I was trying to avoid some gray area. I legally own these files, but modifying them may always fall under that category.

    Still, these video files are from chess software, they are played in sync with board movement. The thing is the chess software is dumb and proprietary and relies on a) the .wmv container and b) these data streams for (I guess) identifying the video files and syncing them to the board moves.

    So as you can see, it's a very unconventional data stream. I don't need it to be parsed or reencoded or anythig, just to copy "as is".

    Btw, I just tried and ffmpeg also won't put the streams into mkv!
    Quote Quote  



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