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• Video conversion flow for HLS (m3u8) with Django and CloudFront

  29 March 2020, by marcos silva de souza

  I was trying to find out how to do something like HLS to prevent BEGINNERS from hacking my content, and I think I got it a little after researching all night.

  Currently, I know I have to do the following:

  • install ffmpeg

  • convert the video after upload (I think it will be this way)

  • send the files, and offer the link to the .m3u8 file (which will be together with the .ts files)

  The question now is:

  • I don’t know yet how to set the cloudfront

  • I don’t know if I will need to use signed urls / cookies

  • I don’t know how to create the video conversion stream (I must use
    ffmpeg to convert and create the files, and then use the aws Python
    SDK to upload to AWS, and then change the video field, or even even
    delete the original video after upload, maybe in the save method?)

• Revision 3461: amélioration du title du volume en affichant le pourcentage (dans la ...

  23 May 2010, by kent1 — Log

  amélioration du title du volume en affichant le pourcentage (dans la version flash) On ne peut toucher au volume que lorsque l’on peut lire le son (on a reçu les metadatas)

• Changing Audio Volume using FFmpeg Android

  23 August 2018, by kataroty

  As I have understood, the only way to change FFmpeg volume is to do it throught a command line.

  This is what should change the volume of the audio :

  ffmpeg -i input.wav -filter:a "volume=1.5" output.wav

  Now I have used FFmpeg with command line before and it looked like this and gave me no errors:

      String[] cmd = { "-i" , pcmtowavTempFile.toString(), "-i", mp3towavTempFile.toString(), "-filter_complex", "amix=inputs=2:duration=first:dropout_transition=3", combinedwavTempFile.toString()};
  
      ffmpeg.execute(cmd, new ExecuteBinaryResponseHandler() {
  
          @Override
  
          public void onSuccess(String message) {                
  
              super.onSuccess(message);
  
              encodeWavToAAC();
  
          }
  
          @Override
  
          public void onFailure(String message) {
  
              super.onFailure(message);
  
              onError(message);
  
          }
  
      });

  But If I try to do it with audio volume in the same method, it just ignores it :

      String[] cmd = { "-i" , pcmtowavTempFile.toString(),  "-filter:a", "volume=1.3", pcmtowavTempFile.toString()};
  
      ffmpeg.execute(cmd, new ExecuteBinaryResponseHandler() {
  
          @Override
  
          public void onSuccess(String message) {
  
              super.onSuccess(message);
  
          }
  
          @Override
  
          public void onFailure(String message) {
  
              super.onFailure(message);
  
  
  
          }
  
      });

  I get neither, no success or error message with the last volume change method.

  Since the volume is there between " ", I tried adding this :

  String[] cmd = { "-i" , pcmtowavTempFile.toString(),  "-filter:a", "\"volume=1.3\"", pcmtowavTempFile.toString()};

  But the app started crashing after adding this line.