VideoVideo - 视频宽度x高度 - MediaPlayer问题

Question

我写了一个示例应用程序来重现问题:

https://github.com/blundell/VideoRatioProblemPerDevice

该VideoView文档状态:

显示视频文件....负责从视频计算其测量值,以便可以在任何布局管理器中使用,并提供各种显示选项,如缩放

问题是三星Galaxy S3对视频做了奇怪的事情而不尊重视频的比例.(也发生在HTC设备上).

全屏片段的活动:

我发现,当在三星Galaxy S3上播放视频时,它将以不正确的比例播放.看起来它已被拉伸到视图的高度而不考虑原始视频的比例.

这里:

但是,如果我在三星Galaxy Nexus上播放视频,则视频的比例正确.

这里:

如果我强制视频占据片段的全部大小,它在S3上看起来没问题(因为屏幕的比例是视频的比例).但是我不想这样做,因为它搞砸了在其他地方使用的片段,即平板电脑.

代码是:

带有VideoView片段的活动.可以在这里看到:GITHUB CODE LINK

如果你想要一些代码在这里是hte VideoPlayerFragment:

public class VideoPlayerFragment extends Fragment {

    private static final String TAG = "VideoPlayer";

    private FitVideoView videoView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View root = inflater.inflate(R.layout.fragment_video_player, container, false);

        videoView = (FitVideoView) root.findViewById(R.id.surface);

        return root;
    }

    public void playVideo() {
        Uri uri = Uri.parse("android.resource://" + getActivity().getPackageName() + "/" + R.raw.test_vid);
        Log.d(TAG, "Uri is: " + uri);
        setVideoLocation(uri);
        if (!videoView.isPlaying()) {
            videoView.start();
        }
    }

    private void setVideoLocation(Uri uri) {
        try {
            videoView.setVideoURI(uri);
        } catch (Exception e) {
            Log.e(TAG, "VideoPlayer uri was invalid", e);
            Toast.makeText(getActivity(), "Not found", Toast.LENGTH_SHORT).show();
        }
    }

    public void pauseVideo() {
        if (videoView.isPlaying()) {
            videoView.pause();
        }
    }
}

Answer 1

所以这个问题VideoView与MediaPlayer+ 一起发生SurfaceView.

当系统询问视频的宽度x高度时,它返回640x480时应该返回852x480.

即

@Override
public void onPrepared(MediaPlayer mp) {
    mp.getVideoWidth();
    mp.getVideoHeight();
}

这是MediaPlayer处理视频容器/编解码器时的错误或视频文件本身的问题.

无论哪种方式,我通过添加我知道视频的宽度和高度是我的代码来规避它.我用这个修复程序更新了Git Repo.黑客警报

这是一个问题的链接,我在那里找到了我视频的不同大小细节.

您可以应用此修复程序的VideoView,或直接到MediaPlayer+ SurfaceView您的选择.这是VideoView答案:

public class FitVideoView extends VideoView {

    private final int mVideoWidth = 853;
    private final int mVideoHeight = 480;
    private boolean applyFix = true;

    public FitVideoView(Context context) {
        super(context);
    }

    public FitVideoView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public FitVideoView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (applyFix) { // A Toggle so I can see both results
            // This doesn't ask the video for it's size, but uses my hardcoded size
            applyFix(widthMeasureSpec, heightMeasureSpec);
        } else {
            // This asks the video for its size (which gives an incorrect WxH) then does the same code as below
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }

    private void applyFix(int widthMeasureSpec, int heightMeasureSpec) {
        int width = getDefaultSize(mVideoWidth, widthMeasureSpec);
        int height = getDefaultSize(mVideoHeight, heightMeasureSpec);
        if (mVideoWidth > 0 && mVideoHeight > 0) {
            if (mVideoWidth * height > width * mVideoHeight) {
                Log.d("TAG", "image too tall, correcting");
                height = width * mVideoHeight / mVideoWidth;
            } else if (mVideoWidth * height < width * mVideoHeight) {
                Log.d("TAG", "image too wide, correcting");
                width = height * mVideoWidth / mVideoHeight;
            } else {
                Log.d("TAG", "aspect ratio is correct: " + width + "/" + height + "=" + mVideoWidth + "/" + mVideoHeight);
            }
        }
        Log.d("TAG", "setting size: " + width + 'x' + height);
        setMeasuredDimension(width, height);
    }
}