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• Livestream WebVTT with HLS

  10 novembre 2022, par kltye

  I've implemented an HLS service with ffmpeg (which pulls a live stream from nginx-rtmp). That all works fine, but now I'm wondering what kind of programming pattern I should be using to get live captioning to work.

  


  I'm planning on using ffmpeg to output the incoming mp4 stream to multiple WAV chunks (i.e., the same way HLS fMP4 parts are created), and then sending those chunks over to Azure Cognitive Services for speech-to-text recognition. My question is, what do I do when I receive the speech results ? Do I dump that vtt file into the same directory as my HLS chunks, and then serve that up using a single m3u8 file (with audio/video tracks along with the text track) ?

  


  Currently ffmpeg is updating the m3u8 playlist for HLS clients ; would it be possible for me to create the m3u8 playlist just for the vtt files, and serve that concurrently with the "regular" HLS playlist ? Also, time synchronization would seem to be difficult, because I'll be sending discrete WAV files over to Azure, so the vtt timestamps are going to be relative to the chunk I'm sending.

  


  Help ! I've done searches online, and I grasp the various issues, but I'm not sure how to plumb them all together.

  


• How do I generate the .ism and .ismc with FFmpeg

  23 décembre 2015, par Chrono

  I’m trying to set up a service that will output .ismv files for smooth streaming.
  Currently I’m using the following command to start the transcode :

  ffmpeg.exe -i <infile> -movflags frag_keyframe -f ismv <outfile>
  
  </outfile></infile>

  As I understand it I don’t need to add isml to the movflags because I don’t want to stream it but the actual output file.

  According to the documentation I already should use the empty_moov and separate_moof flags because I’m using the ismv format. This however does not generate the .ism and .ismc file.

  There is a part about smoothstreaming, but if I use -f smoothstreaming ffmpeg won’t run.

  I did find a win32 binary for ismindex which should generate the manifest files, but when I run it I don’t get any useful output.

  What are the correct parameters for ffmpeg so that it creates all the files at the same time ?

• ffmpeg Command stop executing in background after the application kill

  26 mars 2018, par Amjad Khan

  FFmpeg Command are executed and that are working well, Implemented on android.

  But I am facing problem when the user kill the application the command which I have executed it is terminated.

  I have created background service, which is running in the background but the command stop in the middle, is there any way to handle it

  Code here

  ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
      @Override
  
      public void onFailure(String s) {
  
          Log.e(TAG, "FAILED with output : " + s);
  
      }
  
  
  
      @Override
  
      public void onSuccess(String s) {
  
          Log.e(TAG, "SUCCESS with output : " + s);
  
      }
  
  
  
      @Override
  
      public void onProgress(String s) {
  
        //This method get stoped
  
      }
  
  
  
      @Override
  
      public void onStart() {
  
  
  
      }
  
  
  
      @Override
  
      public void onFinish() {
  
  
  
      }
  
  });