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• mp4Parser : How to create a video file with background audio from an mp3 file

  30 mai 2015, par Manu Antony

  I am trying create an android app which merges a video and audio file using mp4Parser. I succeeded when I merge two mp4 file into a single file that displays the video of the first one and plays the audio of the second file.

  But I couldn’t use an mp3 file as the audio source.

  The below code returns exception when I try to create Movie object with an mp3 file. The same code works fine with m4a and mp4 files.

  Movie audio;
  
      try {
  
          String audioFileName    =   Environment.getExternalStorageDirectory().toString()+"/music.mp3";
  
          audio = new MovieCreator().build(audioFileName);
  
      } catch (IOException e) {
  
          e.printStackTrace();
  
          return false;
  
      } catch (NullPointerException e) {
  
          e.printStackTrace();
  
          return false;
  
      }

  Is it possible to create Movie object from an mp3 file ?

  Anyone please help me on this

• How can I optimize MP4 file encoding in openRTSP to the same level as FFmpeg ?

  2 juillet 2018, par Wolfgang Klenk

  I currently receive and store a RTSP stream from a camera with openRTSP with a command like this :

  openRTSP -4 "rtsp://192.168.41.185/rtsp_tunnel?h26x=4&line=1&inst=2" > movie.mp4

  I can do the same using FFmpeg :

  ffmpeg -i "rtsp://192.168.41.185/rtsp_tunnel?h26x=4&line=1&inst=2" -vcodec copy movie.mp4

  The video frames from the camera are 1280x720 (H.264) at around 30 fps and have a milliseconds timestamp stamped in. When I view the movie.mp4 created by ffmpeg it looks pretty nice, the seconds stamped into the video stream seem rather accurate. On the contrary, if I view the movie.mp4 created by openRTSP, the seconds in the video timestamp last definitively longer than the ones in reality. So one second on video could last two seconds in reality. I made several tests, and it is not an issue of network performance or of handling the messages received from the camera. The reason seems to be the part where the messages are encoded into this MP4 container.

  Is FFmpeg so much faster doing this than openRTSP ?

  Can I optimize the MP4 encoding in openRTSP somehow ?

• osgmovie example crashes when playing flv with alpha channel

  30 novembre 2013, par user1912093

  I m trying to play flv file with alpha channel

  osgmovie -e ffmpeg "The_wolf.flv"

  it shows message "transparent movie, enabling movie"

  then it freezes the osgmovie application without showing anything

  Can anybody tell me what is going wrong ?

  osgmovie behave like this for every flv file with alpha channel

  Thank you !

  Cheers,
  mossin