android - Detect orientation of a recorded video in android

Question

I want to make my custom media player and requires orientation info of video (for detecting it is recorded from front or back camera). for jpeg images i can use ExifInterface.TAG_ORIENTATION but for video how i can find this information.

I tried to grab frame from video file and convert it into jpeg but again it always provides orientation 0 in all cases.

Please help me. Thanks in advance.

Answer 1

Api level 17 之后，我们可以提取视频的方向：MediaMetadataRetriever

MediaMetadataRetriever m = new MediaMetadataRetriever();

m.setDataSource(path);
Bitmap thumbnail = m.getFrameAtTime();
//
if (Build.VERSION.SDK_INT >= 17) {
    String s = m.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION);

    Log.e("Rotation", s);
}

Answer 2

FFmpegMediaMetadataRetriever可以做到这一点，它适用于 API 7+：

FFmpegMediaMetadataRetriever fmmr = new FFmpegMediaMetadataRetriever();
fmmr.setDataSource(path);
String rotation = fmmr.extractMetadata(FFmpegMediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION);
Log.e("Rotation", rotation);
fmmr.release();

Answer 3

经过太多努力，我才知道媒体播放器提供了视频文件的高度和宽度，我们可以从中找出视频的旋转。

MediaPlayer mp = new MediaPlayer();
  try {
      mp.setDataSource(viewSource);
      mp.prepare();
      mp.setOnVideoSizeChangedListener(new OnVideoSizeChangedListener() {
          @Override
          public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {

              int orientation = -1;

              if(width < height){
                  orientation = 0;
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);}
              else{
                  orientation = 1;
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);}

          }
      });
  } catch (IllegalArgumentException e) {
      e.printStackTrace();
  } catch (SecurityException e) {
      e.printStackTrace();
  } catch (IllegalStateException e) {
      e.printStackTrace();
  } catch (IOException e) {
      e.printStackTrace();
  }