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• ffmpeg Unrecognized option '—enable-libopus'

  9 juillet 2021, par Irith

  I'm running ffmpeg from a windows 10 machine.

  


  My goal is to trim silence from the beginning to the end of a track (this works just fine) and compress using opus.

  


  I am new in the "audio elaboration" world so maybe I'm not understanding this properly...but the main issue here is that ffmpeg doesn't recognize —enable-libopus although it's clearly in the options (see attachment).

  


  Can anyone help please ?

  


  

  


• ffmpeg convrsion error for mkv to mp4 conversion

  7 mai 2018, par Bhumi Shah

  My command to convert mkv to mp4 is

  ffmpeg -i abc.mkv -vcodec copy -acodec copy  abc.mp4 null >/dev/null 2> log.log & echo $!;ff

  but if i remove -acodec copy

  ffmpeg -i abc.mkv -vcodec copy abc.mp4 null >/dev/null 2> log.log & echo $!;ff

  Here is my log :

  ffmpeg version 3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
    configuration: --enable-gpl --enable-version3 --enable-shared --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --disable-yasm
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, matroska,webm, from 'abc.mkv':
  
    Metadata:
  
      COMPATIBLE_BRANDS: iso6avc1mp41
  
      MAJOR_BRAND     : dash
  
      MINOR_VERSION   : 0
  
      ENCODER         : Lavf58.3.100
  
    Duration: 00:00:44.58, start: 0.007000, bitrate: 1772 kb/s
  
      Stream #0:0: Video: h264 (Main), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
  
      Metadata:
  
        HANDLER_NAME    : VideoHandler
  
        DURATION        : 00:00:44.545000000
  
      Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
  
      Metadata:
  
        DURATION        : 00:00:44.581000000
  
  [mp4 @ 0x848ae0] Could not find tag for codec opus in stream #1, codec not currently supported in container
  
  Output #0, mp4, to 'abc.mp4':
  
    Metadata:
  
      COMPATIBLE_BRANDS: iso6avc1mp41
  
      MAJOR_BRAND     : dash
  
      MINOR_VERSION   : 0
  
      encoder         : Lavf57.25.100
  
      Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 23.98 fps, 23.98 tbr, 16k tbn, 1k tbc (default)
  
      Metadata:
  
        HANDLER_NAME    : VideoHandler
  
        DURATION        : 00:00:44.545000000
  
      Stream #0:1(eng): Audio: opus, 48000 Hz, stereo (default)
  
      Metadata:
  
        DURATION        : 00:00:44.581000000
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument

  ERROR

  Could not find tag for codec opus in stream #1, codec not currently supported in container
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument

  command :

  ffmpeg -i abc.mkv -vcodec copy -acodec copy -strict -2 abc.mp4 null >/dev/null 2> log.log & echo $!;

  version

  ffmpeg version N-83692-gb8a7dcbde2-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.1 (Debian 5.4.1-5) 20170205

  LOG :

  ffmpeg version N-83692-gb8a7dcbde2-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.1 (Debian 5.4.1-5) 20170205
  
    configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
  
    libavutil      55. 47.100 / 55. 47.100
  
    libavcodec     57. 81.100 / 57. 81.100
  
    libavformat    57. 66.102 / 57. 66.102
  
    libavdevice    57.  3.100 / 57.  3.100
  
    libavfilter     6. 74.100 /  6. 74.100
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  Input #0, matroska,webm, from 'abc.mkv':
  
    Metadata:
  
      COMPATIBLE_BRANDS: iso6avc1mp41
  
      MAJOR_BRAND     : dash
  
      MINOR_VERSION   : 0
  
      ENCODER         : Lavf58.3.100
  
    Duration: 00:00:44.58, start: -0.007000, bitrate: 1772 kb/s
  
      Stream #0:0: Video: h264 (Main), yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
  
      Metadata:
  
        HANDLER_NAME    : VideoHandler
  
        DURATION        : 00:00:44.545000000
  
      Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
  
      Metadata:
  
        DURATION        : 00:00:44.581000000
  
  File 'abc.mp4' already exists. Overwrite ? [y/N] y
  
  [mp4 @ 0x4d172a0] Could not find tag for codec opus in stream #1, codec not currently supported in container
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
      Last message repeated 1 times

  conversion is working. I am not getting why is creating issue. Anyone can help ?

• How to create thumbnail of a video using FFMpegCore ?

  24 janvier, par l.diazborg

  I have a web application, where I need to create thumbnails or images taking the first frame of a video. There are already many examples of this, but I can't find anything that solves my problem. I am using this, but I'm finding it challenging, because I need to read the video and write the result using streams directly. This is my code :

  


  var videoStream = file.OpenReadStream();
var outputStream = new MemoryStream();
FFMpegArguments
    .FromPipeInput(new StreamPipeSource(videoStream))
    .OutputToPipe(new StreamPipeSink(outputStream), options => options
    .WithFrameOutputCount(1)
    .ForceFormat("jpeg")
    )
    .ProcessSynchronously();


  


  Which leads me to the error : Pipe is broken. According to here, the error is related to the fact that the output format cannot be known. Only by adding the .ForceFormat("opus") option does the error disappear, but I understand that the opus format is for audio. Could any expert help me find the solution or tell me how I should do it ? Thank you very much in advance.

  


  UPDATE

  


  I found this answer where it explains how to correctly use ffmpeg pipes. I modified my code and now it is :

  


  var videoStream = file.OpenReadStream();
var outputStream = new MemoryStream();
FFMpegArguments
    .FromPipeInput(new StreamPipeSource(videoStream))
    .OutputToPipe(new StreamPipeSink(outputStream), opt => opt
    .Seek(TimeSpan.Zero)
    .Resize(650, 390)
    .WithFrameOutputCount(1)
    .WithVideoCodec(VideoCodec.Png)
    .ForceFormat("image2pipe")
    )
    .ProcessSynchronously();


  


  The arguments indicated in the answer ffmpeg -i - -ss 00:00:3 -s 650x390 -vframes 1 -c:v png -f image2pipe - are very similar to those generated by my code -i "\\.\pipe\FFMpegCore_9dd64" -ss 00:00:00.000 -s 650x390 -vframes 1 -c:v png -f image2pipe "\\.\pipe\FFMpegCore_997f4" -y, and even so, errors persists.
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