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• ffmpeg selects shortest movie but leaves full length audio

  26 octobre 2015, par Stan James

  I’ve created a tool to create a grid of movies, like in the Brady Bunch opening. It’s a cool, funny effect.

  Here’s a sample movie showing the grid.

  

  The problem is that ffmpeg is choosing the shortest movie to determine the maximum length of overlaid videos, but still using the full length of the first audio track to determine the overall output movie length.

  So all my videos stop moving when the shortest one ends, but the audio plays on for full length of the first movie.

  How can I either (1) set the length of the output movie to the longest input movie or (2) match the audio length to the shortest movie length as well ?

  Gist of my script.

  Based on this ffmpeg example usage which exhibits the same audio problem :

  ffmpeg
  
      -i 1.avi -i 2.avi -i 3.avi -i 4.avi
  
      -filter_complex "
  
          nullsrc=size=640x480 [base];
  
          [0:v] setpts=PTS-STARTPTS, scale=320x240 [upperleft];
  
          [1:v] setpts=PTS-STARTPTS, scale=320x240 [upperright];
  
          [2:v] setpts=PTS-STARTPTS, scale=320x240 [lowerleft];
  
          [3:v] setpts=PTS-STARTPTS, scale=320x240 [lowerright];
  
          [base][upperleft] overlay=shortest=1 [tmp1];
  
          [tmp1][upperright] overlay=shortest=1:x=320 [tmp2];
  
          [tmp2][lowerleft] overlay=shortest=1:y=240 [tmp3];
  
          [tmp3][lowerright] overlay=shortest=1:x=320:y=240
  
      "
  
      -c:v libx264 output.mkv

• Error : avformat_open_input : Protocol not found : -1330794744

  27 octobre 2015, par Lin Juan

  I am building an android stream player using Vitamio.
  Here is my codes :

      mVideoView = (VideoView) findViewById(R.id.videoView);
  
  
  
      path = "https://www.youtube.com/watch?v=vic5gj2qXKg";
  
      mVideoView.setVideoPath(path);
  
  
  
      mVideoView.setMediaController(new MediaController(this));
  
      mVideoView.requestFocus();
  
  
  
      mVideoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
  
          @Override
  
          public void onPrepared(MediaPlayer mediaPlayer) {
  
              mediaPlayer.setPlaybackSpeed(1.0f);
  
          }
  
      });

  But it returns ERROR :

  avformat_open_input : Protocol not found : -1330794744
  error (1, -1330794744)

  I think this error is related to FFMpeg for Vitamio.
  Who can solve this problem ?
  Thank you.

• Concatenating Video Files using FFMPEG YUV issue

  3 novembre 2015, par SpoiledTechie.com

  I am concatenating three videos with FFMPEG.

  The 1st and 3rd video of the concatenation were pulled from an AVI file using FFMPEG and converted into MP4.

  Their codec information is below.

  

  The 2nd video in the concatenation is compiled using FFMPEG. I am compiling frames with FFMPEG to create this video.

  Its codec information is below.

  
  As you can see, the videos share the same codec, resolution and frame rate.

  The only thing they don’t share is the Decoded format. One being 4:4:4 and one being 4:2:2

  I think I understand what YUV means from this link, https://msdn.microsoft.com/en-us/library/windows/desktop/dd391027%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396

  When I concatenate these three videos together, using concat demuxer, it works, but when I try to watch the final video, the video shows the first file playing just right, then the 2nd video in the final video shows up BLANK and the third video plays just fine as well.

  So my question is, how do I concat 3 MP4 files, but change what seems to be the decoded format for the 2nd video to 4:2:2. When I compile the frames, I imagine I can change the YUV format, but I don’t know how just yet.