在我的Android应用程序中,我有一个自定义视频播放器,可以从URL播放视频。当视频以纵向方向拍摄时,在应用程序中,视频会逆时针旋转90度。 我想知道是否有一种方法可以获取视频的方向并相应地旋转视图?因为应用程序仍应能够播放横向视频(当前无方向问题),所以必须动态检测方向。以下是用于显示视频的代码:
以下是您需要翻译的内容:
// create the video controller
videoController = new MediaController(this);
videoControllerExists = true;
videoController.setAnchorView(mediaHolder);
videoController.setPadding(0, 0, 0, bottomButtonHeight);
s3Video = new VideoView(MediaPreview.this);
s3Video.setVideoURI(Uri.parse(mediaURL));
s3Video.setMediaController(videoController);
// do something here to determine if video is in portrait orientation
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int h = displaymetrics.heightPixels;
int w = displaymetrics.widthPixels;
// add the video player to the view and play
mediaHolder.addView(s3Video);
s3Video.start();
s3Video.bringToFront();
videoController.requestFocus();
以下是您需要翻译的内容:
如果您要尝试此功能,这是一段肖像视频可供测试:https://dl.dropboxusercontent.com/u/1000620/portrait.mp4
编辑
查看了一些示例后,我从VideoView切换到了TextureView,并成功地旋转了视频。但我仍然不知道如何从URL检测视频的方向,因此目前所有的视频都被旋转了。
如何从URL检测视频的方向?
以下是我更新后的代码:
public class MediaPreview extends SherlockActivity implements YouTubePlayer.OnInitializedListener, TextureView.SurfaceTextureListener, OnBufferingUpdateListener, OnCompletionListener, OnPreparedListener,
OnVideoSizeChangedListener, MediaPlayerControl {
private MediaPlayer s3VideoPlayer;
private TextureView s3TextureView;
private Surface s;
@Override
protected void onCreate(Bundle savedInstanceState) {
// set up textureview
s3TextureView = (TextureView) findViewById(R.id.s3_video);
s3TextureView.setSurfaceTextureListener(this);
}
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width,
int height) {
s = new Surface(surface);
if(isFromVideo){
playAmazonVideo(mediaHolder);
}
}
private void playAmazonVideo(FrameLayout mediaHolder){
// set up mediacontroller
videoController = new MediaController(this);
videoControllerExists = true;
videoController.setAnchorView(mediaHolder);
videoController.setPadding(0, 0, 0, bottomButtonHeight);
// set scale for textureview
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int h = displaymetrics.heightPixels;
int w = displaymetrics.widthPixels;
LayoutParams videoLayoutParams = new LayoutParams(h, w);
videoLayoutParams.gravity = Gravity.CENTER;
s3TextureView.setScaleX(h/w);
s3TextureView.setLayoutParams(videoLayoutParams);
// Setting up video view using Media Player
try{
s3VideoPlayer = MediaPlayer.create(this, Uri.parse(mediaURL));
s3VideoPlayer.setSurface(s);
s3VideoPlayer.setOnBufferingUpdateListener(this);
s3VideoPlayer.setOnCompletionListener(this);
s3VideoPlayer.setOnPreparedListener(this);
s3VideoPlayer.setScreenOnWhilePlaying(true);
s3VideoPlayer.setOnVideoSizeChangedListener(this);
s3VideoPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
s3VideoPlayer.start();
}
@Override
public void onPrepared(MediaPlayer mp) {
if(isAmazon && mediaURL.length() > 0){
mediaProgress.setVisibility(View.GONE);
videoController.setMediaPlayer(this);
videoController.setEnabled(true);
videoController.show();
}
}
@Override
public boolean onTouchEvent(MotionEvent event){
if(isAmazon){
Log.d(TAG, "showing video controller");
videoController.show();
}
return false;
}
@Override
public boolean canPause() {
return true;
}
@Override
public boolean canSeekBackward() {
return true;
}
@Override
public boolean canSeekForward() {
return true;
}
@Override
public int getCurrentPosition() {
return s3VideoPlayer.getCurrentPosition();
}
@Override
public int getDuration() {
return s3VideoPlayer.getDuration();
}
@Override
public boolean isPlaying() {
return s3VideoPlayer.isPlaying();
}
@Override
public void pause() {
s3VideoPlayer.pause();
}
@Override
public void seekTo(int pos) {
s3VideoPlayer.seekTo(pos);
}
@Override
public void start() {
s3VideoPlayer.start();
}
}
编辑 #2
我一直在寻找检测视频方向的选项,并发现了http://wseemann.github.io/FFmpegMediaMetadataRetriever/
不幸的是,即使我查看视频文件的exif,可以看到方向值为90,但这似乎并没有获取到视频的旋转。因此,如果有其他解决方案,请分享!
编辑 #3
这是我尝试过的另一种方法。我看到可以为MediaPlayer设置OnVideoSizeChangedListener以获取视频的宽度和高度。但是,对于我使用的视频,宽度始终大于高度,播放器根据旋转EXIF值知道是否旋转视频。因此,我也无法使用这个方法...