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• vp9 : enable multi-thread decoding when refreshctx is equal to 0

  11 octobre 2014, par Di Wu

  vp9 : enable multi-thread decoding when refreshctx is equal to 0
  In vp9_decode_frame function, ff_thread_finish_setup is not called
  
  when refreshctx is equal to 0, and the next decoding thread can not
  
  start work until the cunrrent frame has been decoded completely. So
  
  ff_thread_finish_setup needs to be called to enable Multi-thread
  
  decoding in this condition.
  Signed-off-by : Di Wu <di1028.wu@samsung.com>
  
  Signed-off-by : Reynaldo H. Verdejo Pinochet <reynaldo@osg.samsung.com>
  

  • [DH] libavcodec/vp9.c

• Video codec not supported error when adding audio to mp4

  18 février 2019, par WPMed

  I work on an application which you can use to make still photos move. It’s basically a png sequence to mp4 converter.
  Recently we introduced a feature where users can add sound effects to the video.
  Since we released this feature, some users experience problems with the exported video. When they save the file and try to play it, they get a "Video codec not supported" error message. All they get is a black screen, and the audio playing in the background. I use FFmpeg to add audio (in mp3 format) to the mp4 video.
  Here’s an example video, which plays fine on my Mac and on my Samsung Galaxy S6 and S8, but buggy on Samsung SM-A310F (Android 7.0). This is how it looks like on the device.
  I tried to re-encode this video with all the FFmpeg commands I could find, but none of them seemed to work. Can someone spot something that’s not compatible with Android by analyzing the video I linked ?

• Video width is different in different devices

  8 novembre 2017, par David

  I have a special video when i want to get this video’s width code returns different value for Samsung galaxy s6 and Samsung note 3. I tested many different codes and libraries, but result is the same.
  in Samsung galaxy s6 : 640x480
  in Samsung note 3 : 853x480
  when I open this video with Gspot program it shows :

  Recommended Display Size : 853x480

  and this is the same value is returned by our IOS app tested in Iphone 7. aspect radio is not the same and this is big problem.

  here is some of codes I tested :

  (1)

      MediaMetadataRetriever metaRetriever = new MediaMetadataRetriever();
  
      metaRetriever.setDataSource(path);
  
      Bitmap bmp = metaRetriever.getFrameAtTime(-1);
  
  
  
      int height = bmp.getHeight();
  
      int width = bmp.getWidth();

  (2)

      MediaPlayer myMediaPlayer= MediaPlayer.create(ApplicationLoader.applicationContext, 
  
                                       Uri.fromFile(new File(path)));
  
  
  
      width = myMediaPlayer.getVideoWidth();
  
      height = myMediaPlayer.getVideoHeight();

  (3)

   MediaMetadataRetriever metaRetriever = new MediaMetadataRetriever();
  
          metaRetriever.setDataSource(path);
  
   String heights = metaRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT);
  
          String widths = metaRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH);
  
      int height = Integer.valueOf(heights);
  
          int width = Integer.valueOf(widths);

  (4)

    MediaPlayer myMediaPlayer= MediaPlayer.create(ApplicationLoader.applicationContext, Uri.fromFile(new File(path)));
  
              myMediaPlayer.setOnVideoSizeChangedListener((mp, width, height) -> {
  
          int videoWidth = width;
  
          int videoHeight = height;
  
      );
  
              myMediaPlayer.setDataSource(path);
  
              myMediaPlayer.prepare();

  FFmpegMediaMetadataRetriever, FFmpeg Java, ExoPlayer and some other libraries returns the same result.