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• Convert mp4 to mp3

  19 novembre 2012, par CodexVideos

  I am looking for some library or code that will allow me to convert mp4 video to mp3.
  I want it to be for free and compatible with the latest .NET framework (4).

  Also, if possible, I am looking for a free ffmpeg wrapper than I can have in my vb.net application without trial or messageboxes.

  If there is no free ffmpeg wrapper, can someone show me how to perform the conversion from mp4 to mp3 using command line and ffmpeg ?

• compilation problems of lightspark with ffmpeg

  5 février 2017, par user846940

  I tried to compile latest version of lighstspark from github but did not work.
  I get error related to avcodec. I tried different version of ffmpeg but did not work. Can anybody suggest me what version of ffmpeg version should I use.
  Tried latest ffmpeg from github. few older versions from
  http://ffmpeg.org/releases/

  lihtspark source code available in githib.

  error log :
  https://github.com/lightspark/lightspark/issues/279

  few lines from error log :
  /usr/include/libavutil/channel_layout.h:152:55 : error : declaration of C function ‘uint64_t av_get_default_channel_layout(int)’ conflicts with
  uint64_t av_get_default_channel_layout(int nb_channels) ;
  ^
  In file included from /usr/local/include/libavcodec/avcodec.h:457:0,
  ...................
  decoder.cpp:939:92 : error : ‘avcodec_decode_audio2’ was not declared in this scope

  master/src/backends/decoder.cpp:1079:13 : error : ‘AVProbeData’ has no member named ‘mime_type’
  probeData.mime_type=NULL ;
  ^
  /home/usertest/lightspark-master/src/backends/decoder.cpp:1100:10 : warning : ‘int av_open_input_stream(AVFormatContext**, AVIOContext*, const char*, AVInputFormat*, AVFormatParameters*)’ is deprecated (declared at /usr/local/include/libavformat/avformat.h:1462) [-Wdeprecated-declarations]
  int ret=av_open_input_stream(&formatCtx, avioContext, "lightspark_stream", fmt, NULL) ;
  ^

• Install ffmpeg on Heruko

  5 octobre 2020, par islalobo

  I have a little node.js app on heroku and I'm trying to use ffmpeg to convert some audio that has been recorded.

  


  To do that I need to install ffmpeg buildpack.

  


  When I add the build pack and deploy, I don't get any errors in the logs, but the application doesn't load and gives me a non-discript error.

  


  Build packs I've tried

  


  

  • https://elements.heroku.com/buildpacks/jonathanong/heroku-buildpack-ffmpeg-latest

  


  • https://elements.heroku.com/buildpacks/dwnld/heroku-buildpack-ffmpeg

  


  


  Code to convert audio

  


    try {
    let process = new ffmpeg(`./public/messages/${req.body.message}`);
    process.then((audio) => {
      audio.fnExtractSoundToMP3(`/messages/${req.body.message}.mp3`, (error, file) => {
        if (!error) console.log('Audio File: ', file);
        if (error) console.log(error);
      });
    }, (error) => {
      console.log('Error: ', error);
    });
  }
  catch(error) {
    console.log(error.code, error.msg);
  }