MediaPlayer播放声音但不播放视频 [英] MediaPlayer playing sound but not video
问题描述
我正在尝试使用SurfaceView从Android播放视频.
I'm trying to play a video from Android using a SurfaceView.
我可以加载视频，声音可以正确播放，但是看不到视频.
I can load the video, the sound is played correctly but I can't see the video.
这是我的活动:
public class VideoTest extends Activity implements OnBufferingUpdateListener, OnCompletionListener, OnPreparedListener, OnVideoSizeChangedListener, SurfaceHolder.Callback, OnErrorListener {
private static final String TAG = "MediaPlayerDemo";
private int mVideoWidth;
private int mVideoHeight;
private MediaPlayer mMediaPlayer;
private SurfaceView mPreview;
private SurfaceHolder holder;
private String path;
private Bundle extras;
public static final String MEDIA = "media";
private static final int LOCAL_AUDIO = 1;
public static final int STREAM_AUDIO = 2;
private static final int RESOURCES_AUDIO = 3;
private static final int LOCAL_VIDEO = 4;
public static final int STREAM_VIDEO = 5;
private boolean mIsVideoSizeKnown = false;
private boolean mIsVideoReadyToBePlayed = false;
private RelativeLayout layout;
/**
*
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
mPreview = new SurfaceView(this);
holder = mPreview.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
extras = getIntent().getExtras();
mPreview.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
layout = new RelativeLayout(this);
layout.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));
layout.addView(mPreview, 0);
setContentView(layout);
}
private void playVideo(Integer Media) {
doCleanUp();
try {
mMediaPlayer = MediaPlayer.create(this, R.raw.video);
mMediaPlayer.setDisplay(holder);
mMediaPlayer.setOnBufferingUpdateListener(this);
mMediaPlayer.setOnCompletionListener(this);
mMediaPlayer.setOnPreparedListener(this);
mMediaPlayer.setOnVideoSizeChangedListener(this);
mMediaPlayer.setOnErrorListener(this);
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
} catch (Exception e) {
Log.e(TAG, "error: " + e.getMessage(), e);
}
}
public void onBufferingUpdate(MediaPlayer arg0, int percent) {
Log.d(TAG, "onBufferingUpdate percent:" + percent + " pos : " + mMediaPlayer.getCurrentPosition() + " / " + mMediaPlayer.getDuration());
if (mMediaPlayer.isPlaying()) {
Log.d(TAG, "Playing");
} else {
mMediaPlayer.start();
}
}
public void onCompletion(MediaPlayer arg0) {
Log.d(TAG, "onCompletion called");
}
public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
Log.v(TAG, "onVideoSizeChanged called");
if (width == 0 || height == 0) {
Log.e(TAG, "invalid video width(" + width + ") or height(" + height
+ ")");
return;
}
mIsVideoSizeKnown = true;
mVideoWidth = width;
mVideoHeight = height;
if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) {
startVideoPlayback();
}
}
public void onPrepared(MediaPlayer mediaplayer) {
Log.d(TAG, "onPrepared called");
mIsVideoReadyToBePlayed = true;
if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) {
startVideoPlayback();
}
}
public void surfaceChanged(SurfaceHolder surfaceholder, int i, int j, int k) {
Log.d(TAG, "surfaceChanged called. Width : " + j + ", height : " + k);
holder = surfaceholder;
mMediaPlayer.setDisplay(holder);
mIsVideoSizeKnown = true;
mVideoWidth = j;
mVideoHeight = k;
if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) {
startVideoPlayback();
}
}
public void surfaceDestroyed(SurfaceHolder surfaceholder) {
Log.d(TAG, "surfaceDestroyed called");
}
public void surfaceCreated(SurfaceHolder holder) {
Log.d(TAG, "surfaceCreated called");
playVideo(extras.getInt(MEDIA));
}
@Override
protected void onPause() {
super.onPause();
releaseMediaPlayer();
doCleanUp();
}
@Override
protected void onDestroy() {
super.onDestroy();
releaseMediaPlayer();
doCleanUp();
}
private void releaseMediaPlayer() {
if (mMediaPlayer != null) {
mMediaPlayer.release();
mMediaPlayer = null;
}
}
private void doCleanUp() {
mVideoWidth = 0;
mVideoHeight = 0;
mIsVideoReadyToBePlayed = false;
mIsVideoSizeKnown = false;
}
private void startVideoPlayback() {
Log.v(TAG, "startVideoPlayback " + mVideoWidth + "x" + mVideoHeight);
int width = mPreview.getWidth();
int height = mPreview.getHeight();
float boxWidth = width;
float boxHeight = height;
float videoWidth = mMediaPlayer.getVideoWidth();
float videoHeight = mMediaPlayer.getVideoHeight();
Log.i(TAG, String.format("startVideoPlayback @ video %dx%d - box %dx%d", (int) videoWidth, (int) videoHeight, width, height));
float wr = boxWidth / videoWidth;
float hr = boxHeight / videoHeight;
float ar = videoWidth / videoHeight;
if (wr > hr) {
width = (int) (boxHeight * ar);
} else {
height = (int) (boxWidth / ar);
}
Log.i(TAG, String.format("Scaled to %dx%d", width, height));
holder.setFixedSize(width, height);
mMediaPlayer.start();
}
public boolean onError(MediaPlayer arg0, int arg1, int arg2) {
Log.e(TAG, "ERROR called : " + arg1 + ", " + arg2);
return false;
}
}
从不调用onVideoSizeChanged函数，但调用onPrepared和surfaceChanged.
因此调用了startVideoPlayback函数，但视频的宽度和高度均为0.
The onVideoSizeChanged function is never called but the onPrepared and surfaceChanged are called.
Thus the startVideoPlayback function is called, but the video width and height are 0.
我正在播放视频，因为我可以听到声音，但是屏幕上什么都没有显示.
我还尝试为SurfaceHolder对象的setFixedSize函数提供原始宽度和高度，但仍然没有显示任何内容.
My video is playing, as I can hear the sound, but nothing is displayed on the screen.
I also tried to give raw width and height to the setFixedSize function of the SurfaceHolder object but I still don't have anything displayed.
你能帮我吗? 我正在使用Android 8
Can you help me? I'm using Android 8
编辑
这是我从资源中播放视频时的日志:
Here is the log I have when I'm playing a video from the resources :
WARN info/warning (1, 35)
WARN info/warning (1, 44)
DEBUG Duration : 101248
DEBUG surfaceChanged called. Width : 480, height : 270
INFO Info (1,35)
INFO Info (1,44)
DEBUG onPrepared called
VERBOSE startVideoPlayback 480x270
INFO startVideoPlayback @ video 0x0 - box 480x270
INFO Scaled to 480x0
DEBUG surfaceDestroyed called
编辑2
我尝试了另一个视频，并且可以正常工作.
I tried with another video and it's working.
以下是无效"视频的规格:
Here are the specifications of the "not working" video :
- 容器:MP4-QuickTime
- 速率:2340 Kbps
- 格式:H.264/MPEG-4-AVC
- 大小:1280 * 640
- 纵横像素:未定义
- 图片比例:2.000
- 编码配置文件:Baseline@L3.1
- Container : MP4 - QuickTime
- Rate : 2 340 Kbps
- Format : H.264/MPEG-4-AVC
- Size : 1280*640
- Aspect pixel : undefined
- Image proportion : 2.000
- Encoding profile : Baseline@L3.1
以下是工作视频的规格:
Here are the specifications for the working video :
- 容器:MP4-QuickTime
- 费率:537 Kbps
- 格式:H.264/MPEG-4-AVC
- 大小:640 * 360
- 纵横像素:未定义
- 图像比例:16:9
- 编码配置文件:基准@ L3.0
- Container : MP4 - QuickTime
- Rate : 537 Kbps
- Format : H.264/MPEG-4-AVC
- Size : 640*360
- Aspect pixel : undefined
- Image proportion : 16:9
- Encoding profile : Baseline@L3.0
您知道第一个视频出了什么问题吗?
Do you know what's wrong with the first video ?
推荐答案
可尝试的一些方法:
1)您是否应该在playVideo方法中调用mMediaPlayer.prepareAsync()?
1) Should you be calling mMediaPlayer.prepareAsync() in your playVideo method?
2)尝试删除onPrepared中的if语句
2) Try removing your if statement in onPrepared
3)我会打电话给holder.setSizeFromLayout();然后从onPrepared回调(而不是onBufferingUpdate)中选择mMediaPlayer.start().
3) I would call holder.setSizeFromLayout(); and then mMediaPlayer.start() from your onPrepared callback (rather than onBufferingUpdate).
这篇关于MediaPlayer播放声音但不播放视频的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
