使用RTSP网址的Android 4.0.4的MediaPlayer prepare问题 [英] Android 4.0.4 MediaPlayer prepare issue using RTSP urls
问题描述
我遇到了视频流应用程序我工作的一个奇怪的问题。视频/音频的实际数据流是工作的罚款对我所有的测试设备。然而，看似任何设备4.0+上，使用RTSP URL，prepare（）时，立即返回（这将导致一个问题，提供适当的信息反馈给用户，而视频加载并干扰其他几个系统我已经制定）。
下面是code，我初始化和设置我的MediaPlayer块，但保留了几件事：
- 在我的initPlayer方法是从AsyncTask的调用。
- 视频最终会正常播放，但prepare立即返回创建过程中的视频负载缺乏反馈给用户。
- 在整个过程中发生任何形式的错误
- 在启动（）通过在$ P $我在preparedListener，这显然成为一个问题时，prepare（）返回它实际上是准备进行播放ppared方法被调用的MediaPlayer的。
- 在HTTP流似乎做工精细，低于4.0每个测试设备上的问题不会发生。
我一直在试图解决这一问题的时间可笑的量，而一直没能找到其他人谁也碰到了这个问题。任何想法将大大AP preciated。
公共无效initPlayer（）{
//我们首先需要确保的MediaPlayer不为空
如果（mMediaPlayer == NULL）{
mMediaPlayer =新的MediaPlayer（）;
mMediaPlayer.setOn preparedListener（媒体播放器preparedListener）;
mMediaPlayer.setOnCompletionListener（mediaPlayerCompletionListener）;
mMediaPlayer.setAudioStreamType（AudioManager.STREAM_MUSIC）;
}
//如果视频/流已被选定，而另一个已经被打
否则如果（mMediaPlayer.isPlaying（））{
mMediaPlayer.reset（）;
}
//视频是不是在全屏模式
第二= FALSE;
尝试 {
mMediaPlayer.setDataSource（videoString）;
持有人= M preview.getHolder（）;
mMediaPlayer.setDisplay（保持器）;
mMediaPlayer prepare（）。
}赶上（抛出：IllegalArgumentException E）{
e.printStackTrace（）;
}赶上（SecurityException异常E）{
e.printStackTrace（）;
}赶上（IllegalStateException异常E）{
e.printStackTrace（）;
}赶上（IOException异常E）{
e.printStackTrace（）;
}
}
//在preparedListener
私人preparedListener媒体播放器preparedListener =新在preparedListener（）{
公共无效于prepared（MediaPlayer的MP）{
mp.start（）;
vidPb.setVisibility（View.INVISIBLE）;
}
};
使用的 MP。prepareAsync（） ，因为它是流媒体更好。使用 prepare（）块，直到MediaPlayer的准备回放或一个IllegalStateException发生。此外，在安卓4.0（ICS），阻断任何UI线程更是严格，可能会导致ANR（活动不响应）对话框出现。
最后一个想法，尽量避免使用 e.printStackTrace（）;在Android应用程序。
相反，使用 Log.e（为tag_string，e.getMessage（），E）; 打印错误，你可以从的 的logcat 。
所有的一切，它应该看起来是这样的：
尝试{
mMediaPlayer.setDataSource（videoString）;
持有人= M preview.getHolder（）;
mMediaPlayer.setDisplay（保持器）;
。mMediaPlayer prepareAsync（）;
}赶上（抛出：IllegalArgumentException E）{
Log.e（为tag_string，e.getMessage（），E）;
}赶上（SecurityException异常E）{
Log.e（为tag_string，e.getMessage（），E）;
}赶上（IllegalStateException异常E）{
Log.e（为tag_string，e.getMessage（），E）;
}赶上（IOException异常E）{
Log.e（为tag_string，e.getMessage（），E）;
}
I am experiencing an odd issue with a video streaming application I am working on. The actual streaming of video/audio is working fine on all of my test devices. However, on seemingly any device 4.0+, when using an RTSP URL, prepare() returns instantly (this causes an issue providing proper feedback to the users while a video is loading and interferes with a few other systems I have in place).
Below is the block of code where I initialize and setup my MediaPlayer, but keep a few things in mind:
- My initPlayer method is called from an AsyncTask.
- The video does eventually play correctly, but prepare returning instantly creates a lack of feedback to the user during a video load.
- No errors of any kind occur during the entire process
- start() is called on the MediaPlayer via the onPrepared method in my OnPreparedListener, which obviously becomes an issue when prepare() returns before it is actually ready to be played.
- HTTP streams seem to work fine, and on every test device below 4.0 the issue does not occur.
I have been trying to fix this for a ridiculous amount of time, and haven't been able to find anyone else who has ran into this problem. Any ideas would be greatly appreciated.
public void initPlayer() {
//We first need to make sure the MediaPlayer isn't null
if(mMediaPlayer==null){
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setOnPreparedListener(mediaPlayerPreparedListener);
mMediaPlayer.setOnCompletionListener(mediaPlayerCompletionListener);
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
}
//If a video/stream has been chosen while another is already playing
else if(mMediaPlayer.isPlaying()){
mMediaPlayer.reset();
}
//Video is not in full screen mode
second = false;
try {
mMediaPlayer.setDataSource(videoString);
holder = mPreview.getHolder();
mMediaPlayer.setDisplay(holder);
mMediaPlayer.prepare();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
//onPreparedListener
private OnPreparedListener mediaPlayerPreparedListener = new OnPreparedListener(){
public void onPrepared(MediaPlayer mp) {
mp.start();
vidPb.setVisibility(View.INVISIBLE);
}
};
Use mp.prepareAsync() as it is better for streaming media. Using prepare() blocks until MediaPlayer is ready for playback or an IllegalStateException occurs. Also, in android 4 (ICS), blocking on any UI thread is even more strict and may cause an ANR (Activity not responding) dialog to appear.
One final thought, try to avoid using e.printStackTrace(); in android apps.
Instead, use the Log.e("TAG_STRING", e.getMessage(), e); to print errors to the android logging system that you can access from logcat.
All in all, it should looks something like this:
try {
mMediaPlayer.setDataSource(videoString);
holder = mPreview.getHolder();
mMediaPlayer.setDisplay(holder);
mMediaPlayer.prepareAsync();
} catch (IllegalArgumentException e) {
Log.e("TAG_STRING", e.getMessage(), e);
} catch (SecurityException e) {
Log.e("TAG_STRING", e.getMessage(), e);
} catch (IllegalStateException e) {
Log.e("TAG_STRING", e.getMessage(), e);
} catch (IOException e) {
Log.e("TAG_STRING", e.getMessage(), e);
}
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