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  • ffmpeg doesn't detect the subtitle format (webvtt) and refuses to copy it

    29 novembre 2023, par Thomas

    I am trying to re-encode the audio on some video files.
I want to copy the video and subtitles without touching them, however, ffmpeg doesn't detect the format of the subtitle (which is webvtt) and refuses to do anything.

    



    fmpeg -copy_unknown -analyzeduration 2000M -probesize 2000M -i input.mkv -map_metadata 0 -map 0 -c copy -c:a:0 aac -b:a 384k output.mkv

    



    [matroska,webm @ 0x5597558e4040] Unknown/unsupported AVCodecID S_TEXT/WEBVTT.
[matroska,webm @ 0x5597558e4040] Could not find codec parameters for stream 2 (Subtitle: none): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Guessed Channel Layout for Input Stream #0.1 : 5.1
Input #0, matroska,webm, from 'input.mkv':
  Metadata:
    encoder         : libebml v1.3.9 + libmatroska v1.5.2
    creation_time   : 2020-03-05T09:03:02.000000Z
  Duration: 00:56:33.26, start: 0.000000, bitrate: 3597 kb/s
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Metadata:
      BPS-eng         : 3340067
      DURATION-eng    : 00:56:33.140000000
      NUMBER_OF_FRAMES-eng: 81354
      NUMBER_OF_BYTES-eng: 1416664616
      _STATISTICS_WRITING_APP-eng: mkvmerge v38.0.0 ('The Silent Type') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-03-05 09:03:02
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:1: Audio: eac3, 48000 Hz, 5.1, fltp (default)
    Metadata:
      BPS-eng         : 256000
      DURATION-eng    : 00:56:33.248000000
      NUMBER_OF_FRAMES-eng: 106039
      NUMBER_OF_BYTES-eng: 108583936
      _STATISTICS_WRITING_APP-eng: mkvmerge v38.0.0 ('The Silent Type') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-03-05 09:03:02
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:2(eng): Subtitle: none (default)
    Metadata:
      BPS-eng         : 38
      DURATION-eng    : 00:54:47.388000000
      NUMBER_OF_FRAMES-eng: 514
      NUMBER_OF_BYTES-eng: 15766
      _STATISTICS_WRITING_APP-eng: mkvmerge v38.0.0 ('The Silent Type') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-03-05 09:03:02
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES

Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (eac3 (native) -> aac (native))
  Stream #0:2 -> #0:2 (copy)

[aac @ 0x5597b06ae000] Using a PCE to encode channel layout "5.1(side)"
[matroska @ 0x5597b06ab540] Subtitle codec 0 is not supported.
Could not write header for output file #0 (incorrect codec parameters ?): Function not implemented
Error initializing output stream 0:1 -- 
[aac @ 0x5597b06ae000] Qavg: -nan
Conversion failed!


    



    VLC shows it as WebVTT and displays the subtitles correctly :

    



    VLC shows as WebVTT

    



    MediaInfo also detects properly as webvtt :

    



    Text
ID                                       : 3
Format                                   : S_TEXT/WEBVTT
Codec ID                                 : S_TEXT/WEBVTT
Duration                                 : 54 min 47 s
Bit rate                                 : 38 b/s
Count of elements                        : 514
Stream size                              : 15.4 KiB (0%)
Language                                 : English
Default                                  : Yes
Forced                                   : No


    



    My ffmpeg was built with webvtt :

    



    $ ffmpeg -codecs | grep VTT
ffmpeg version n4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.3.0 (Arch Linux 9.3.0-1)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3
  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
 DES... webvtt               WebVTT subtitle


    



    How can I tell ffmpeg "this is webvtt, just copy it please !" ?

    



    EDIT : RESOLVED (thanks @Gyan)

    



    To force the decoder, -c:s webvtt must be set before the input :
fmpeg -analyzeduration 50M -probesize 50M -c:s webvtt -i input.mkv ...

    


  • ffmpeg mp4 video cannot be played in old tv

    24 mai 2020, par Rick Brian

    I've convert many video to mp4 using ffmpeg and playing well on my TV.
    
But ever since I change my laptop to a new one, my conversion failed to load on the TV.

    



    I have tried to download old-stable ffmpeg Windows build, I tried also download a win-32 build, no good.
(I'm using x64 laptop with Windows 10 64-bit, just the same like previous laptop)
    
I also tried to add -pix_fmt yuv420p, still no good.

    



    This is code that I used to convert using ffmpeg :
    
ffmpeg -f concat -i "D:\Convert\LISTCAM.TXT" -c:v libx264 -c:a aac -pix_fmt yuv420p "Apr 2nd.mp4"

    



    I also tried to compare using ffmpeg -i between my playable mp4 file with new not-playable mp4,
    
both are just similar except the encoder header.

    



    Playable mp4 :

    



    ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 8.3.1 (GCC) 20190414
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --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
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'E:\2020-DEC\Dec 13-PSTM-001.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.83.100
  Duration: 01:01:47.46, start: 0.000000, bitrate: 1586 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x714 [SAR 1071:1072 DAR 120:67], 1450 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
At least one output file must be specified


    



    Non-playable mp4 :

    



    ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 8.3.1 (GCC) 20190414
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --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
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Convert\TEST.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.20.100
  Duration: 00:00:18.54, start: 0.000000, bitrate: 4483 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x808, 4517 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
    Metadata:
      handler_name    : video.264#trackID=1:fps=23.976 - Imported with GPAC 0.5.0-rev
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : GPAC ISO Audio Handler
At least one output file must be specified


    



    Update :

    



      

    • I did a single-file input instead of a concatenation list.

      • 


    • I did a codec copy from a playable file, it works, but when I try to re-encode, it does not.
      
ffmpeg -i "Playable-video-file.mp4" -c:v copy -c:a aac "Output.mp4" this works

      • 


    



    ffmpeg -i "Playable-video-file.mp4" -c:v libx264 -crf 23 -profile:v main -level:v 3.0 -preset:v medium -c:a aac "Output.mp4" and this don't

    



      

    • I did the very same syntax and the same ffmpeg build on a friend's laptop with the same Windows 10 x64 architecture... the output file works fine and playable on my TV...

      • 


    • Friend's is Intel i5, mine is Intel i7

      • 


    


  • why ffmpeg php conversion 0 bytes empty

    9 avril 2020, par user3080392

    I'm trying to convert a .wav file to .ogg with php and ffmpeg. The ogg file keeps being created as 0 bytes :

    



    <?php
$ffmpeg = "/usr/local/bin/ffmpeg";
shell_exec("$ffmpeg -y -i clip.wav clip.ogg");
?>


    



    I've tried various parameters for the ogg file, but none work. This simple conversion should work, but it doesn't.

    



    Here is the log :

    



    ffmpeg started on 2020-04-08 at 22:11:58
Report written to "ffmpeg-20200408-221158.log"
Command line:
/usr/local/bin/ffmpeg -y -i clip.wav clip.ogg -report
ffmpeg version N-71954-gbc6f84f Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16)
configuration: --prefix=/usr --enable-version3 --enable-gpl --enable-shared - 
-enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libvpx -- 
enable-libx264 --enable-libxvid --enable-libopencore-amrwb --enable- 
libopencore-amrnb --enable-postproc --enable-nonfree --enable-pthreads -- 
enable-x11grab --enable-libfaac --enable-libopenjpeg --enable-zlib --disable- 
doc
libavutil      54. 23.101 / 54. 23.101
libavcodec     56. 37.101 / 56. 37.101
libavformat    56. 31.102 / 56. 31.102
libavdevice    56.  4.100 / 56.  4.100
libavfilter     5. 16.101 /  5. 16.101
libswscale      3.  1.101 /  3.  1.101
libswresample   1.  1.100 /  1.  1.100
libpostproc    53.  3.100 / 53.  3.100
Splitting the commandline.
Reading option '-y' ... matched as option 'y' (overwrite output files) with 
argument '1'.
Reading option '-i' ... matched as input file with argument 'clip.wav'.
Reading option 'clip.ogg' ... matched as output file.
Reading option '-report' ... matched as option 'report' (generate a report) 
with argument '1'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option y (overwrite output files) with argument 1.
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input file clip.wav.
Successfully parsed a group of options.
Opening an input file: clip.wav.
[wav @ 0xe2fee0] Format wav probed with size=2048 and score=99
[wav @ 0xe2fee0] Before avformat_find_stream_info() pos: 44 bytes read:32768 
seeks:0
[wav @ 0xe2fee0] parser not found for codec pcm_s16le, packets or times may 
be invalid.
[wav @ 0xe2fee0] probing stream 0 pp:14
[wav @ 0xe2fee0] probing stream 0 pp:13
[wav @ 0xe2fee0] probing stream 0 pp:12
[wav @ 0xe2fee0] probing stream 0 pp:11
[wav @ 0xe2fee0] probing stream 0 pp:10
[wav @ 0xe2fee0] probing stream 0 pp:9
[wav @ 0xe2fee0] probing stream 0 pp:8
[wav @ 0xe2fee0] probing stream 0 pp:7
[wav @ 0xe2fee0] probing stream 0 pp:6
[wav @ 0xe2fee0] probing stream 0 pp:5
[wav @ 0xe2fee0] probing stream 0 pp:4
[wav @ 0xe2fee0] probing stream 0 pp:3
[wav @ 0xe2fee0] probing stream 0 pp:2
[wav @ 0xe2fee0] probing stream 0 pp:1
[wav @ 0xe2fee0] probed stream 0
[wav @ 0xe2fee0] parser not found for codec pcm_s16le, packets or times may 
be invalid.
[wav @ 0xe2fee0] All info found
[wav @ 0xe2fee0] After avformat_find_stream_info() pos: 204844 bytes 
read:213916 seeks:0 frames:50
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, wav, from 'clip.wav':
Duration: 00:00:01.11, bitrate: 1536 kb/s
Stream #0:0, 50, 1/48000: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 
Hz, 2 channels, s16, 1536 kb/s
Successfully opened the file.
Parsing a group of options: output file clip.ogg.
Successfully parsed a group of options.
Opening an output file: clip.ogg.
Successfully opened the file.
detected 32 logical cores
[AVFilterGraph @ 0xe25560] Error initializing threading.
[AVFilterGraph @ 0xe25560] Error creating filter 'anull'
Error opening filters!
[AVIOContext @ 0xe72180] Statistics: 0 seeks, 0 writeouts
[AVIOContext @ 0xe2f560] Statistics: 213916 bytes read, 0 seeks


    


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