不同设备的视频宽度不同

Question

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.

Answer 1

尝试用设备的DPI比例缩放图像，我对预制位图有同样的问题，原来的像素宽度是这样缩放的。