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• doc/developer : revise mailing list section

  4 décembre 2017, par Jim DeLaHunt

  doc/developer : revise mailing list section
  The Developer Documentation had instructions to
  
  subscribe to the ffmpeg-cvslog email list. But that is
  
  no longer accurate. For the purposes in this section —
  
  review of patches, discussion of development issues —
  
  ffmpeg_devel is the appropriate email list. Some developers
  
  may want to monitor ffmpeg-cvslog, but it is not mandatory.
  This is v3 of this doc, based on discussion in thread
  
  <https://ffmpeg.org/pipermail/ffmpeg-devel/2017-November/220528.html> ;
  
  and in response to docs Maintainer comments in
  
  <https://ffmpeg.org/pipermail/ffmpeg-devel/2017-December/221596.html>.
  1. In doc/developer.texi, add a new section about
  
  ffmpeg-devel, based on existing text from ffmpeg-cvslog
  
  section regarding discussion of patches and of
  
  development issues. Reflect wording from discussion at
  
  <https://ffmpeg.org/pipermail/ffmpeg-devel/2017-November/221199.html> ;
  
  but with copy-editing to make wording more concise.
  2. In doc/developer.texi, rewrite the ffmpeg-cvslog section
  
  to match the current usage of ffmpeg-cvslog. Some
  
  developers choose to follow this list, but it is not
  
  mandatory.
  There are a lot of improvements possible to the
  
  Developer Documentation page, beyond this refactoring.
  
  However, making those improvements is a much bigger
  
  and more difficult task.  This change is "low hanging
  
  fruit".
  Signed-off-by : Jim DeLaHunt <from.ffmpeg-dev@jdlh.com>
  
  Signed-off-by : Timothy Gu <timothygu99@gmail.com>
  

  • [DH] doc/developer.texi

• How to mix a list of audio files with their timestamps in ffmpeg ? [closed]

  25 novembre 2020, par user14706760

  Track 1 : I have a list of mono audio files (about 100 pcs.) and a list of their timestamps.

  


  Track 2 : I have another list of stereo sound effects (about 20 pcs.) and a list of their timestamps.

  


  Track 3 : I have another stereo file which is longer than track 1 and track 2.

  


  How can I mix all three tracks and then apply normalization ? I found that normalization can be done like this :

  


  ffmpeg-normalize 1.wav 2.wav -o 1n.wav 2n.wav


  


  But I can't figure out how I should apply amix or amerge function in this case.

  


• Android Merging two or more videos from the List to a single synchronised video

  18 août 2017, par Alok Kumar Verma

  I’ve an activity which has the certain videos inside my recyclerview. I’ve one button which takes you to the next activity which has the VideoView.
  Now the main task is to merge the videos to single synchronous video and that video file will be played in the video View.

  The mapping is like -> EditVideoActivity.java (List of Videos in recyclerview) -> Processing the video merging into one -> saving somewhere -> the merged video getting played.

  I’ve researched on several sites about this and came to know that two things are available for this, these are :

  1. FFMPEG

  2. MP4Parser

  Now I’ve followed some questions on StackOverflow about this :

  1. FFMPEG Usage getting problem in Orientation : This doesn’t serve my motive. As this guy has used some coding.
  2. Mp4Parser : They have moved their site to Github but I got 504 gateway timeout so no guidance for that.

  Developer Android has MediaCodec and I went there it was quiet complex

  I’m sending out the data in string format or i must say the video path in array format to other activity and is working fine.

  I’ve done some homework what I did is just in media player I appended the videos. But I have to merge the videos and then it has to be played inside the videoplayer.

  1. When the button is clicked it merges the videos and saves it in a storage specified

  The same videos is now played in videoplayer

  EditVideo.java from where the data is passed from the press of the button

  audioButton.setOnClickListener(new View.OnClickListener() {
  
                    @Override
  
                    public void onClick(View view) {
  
                        //the position of the video
  
                        videoPosition = selectedVideo;
  
  
  
                        if(videoPosition != null){
  
                            Intent intent = new Intent(EditVideoActivity.this, AudioActivity.class);
  
                            intent.putExtra("videoData",videoPosition);
  
                            Log.e("VIDEO_SENT_DATA=======", videoPosition);
  
                            startActivity(intent);
  
                        }else
  
                            Toast.makeText(EditVideoActivity.this,"You have not selected any video",Toast.LENGTH_LONG)
  
                                    .show();
  
                    }
  
                });

  from here the data is getting passed, I’m working on how to merge the videos with the press of the above button

  And PreviewActivity.java is the page where the videoView is there to be played (the merged files)

  I’ve done this : Appending the videos in onCreate()

  //getting the passed value from the previous activity
  
      Bundle extras = getIntent().getExtras();
  
      final ArrayList<string> videoReceived = extras.getStringArrayList("videos");
  
      Log.e("VIDEO_RECEIVED",videoReceived.toString());
  
  
  
      mVideoPlayer.setVideoPath(String.valueOf(videoReceived.get(0)));
  
      mMediaController = new MediaController(this);
  
      mMediaController.setMediaPlayer(mVideoPlayer);
  
      mVideoPlayer.setMediaController(mMediaController);
  
      mVideoPlayer.setBackgroundColor(Color.TRANSPARENT);
  
      mVideoPlayer.requestFocus();
  
      mVideoPlayer.start();
  
      Log.e("VIDEO_SIZE===",String.valueOf(videoReceived.size()));
  
      mVideoPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
  
          @Override
  
          public void onCompletion(MediaPlayer mediaPlayer) {
  
  
  
              if( currentIndex &lt; videoReceived.size()){
  
                  String uri = String.valueOf(videoReceived.get(currentIndex));
  
                  mVideoPlayer.setVideoPath(uri);
  
                  mVideoPlayer.start();
  
                  currentIndex++;
  
              }
  
          }
  
      });
  
  </string>