在android中检测录制视频的方向 [英] Detect orientation of a recorded video in android

问题描述

我想让我的自定义媒体播放器，并要求视频的方向信息（用于检测它是从前面或后面的相机记录）。对于jpeg图像，我可以使用 ExifInterface.TAG_ORIENTATION ，但对于视频，我可以找到这些信息。

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.

我试图从视频文件抓取框架并将其转换为jpeg，但是在所有情况下，它总是提供方向 0 。

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

请帮我。感谢提前。

推荐答案

经过太多的努力，我知道媒体播放器提供视频文件的高度和宽度，从中我们可以拍摄视频的旋转。

After too much effort i came to know that media player provides height and width of video file from which we can fin out rotation of video.

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();
  }

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