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android - Media Recorder 在 android for camera 中启动失败

转载 作者:塔克拉玛干 更新时间:2023-11-02 19:20:11 37 4
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我正在开发视频录制应用程序,我想在其中显示预览,当用户单击录制按钮时它开始录制,当用户单击停止按钮时它停止录制。

我的表面上有视频预览,但当我按下开始按钮时,它崩溃并显示错误“MEDIA.RECORDER.START( native 方法)。这是我的代码,请大家帮帮我。

  @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
surfaceView = (SurfaceView) findViewById(R.id.surface_camera);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
Button start =(Button)findViewById(R.id.start);
Button stop =(Button)findViewById(R.id.stop);
stop.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
camera.stopPreview();
stopRecording();
}
});
start.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startRecording();
}
});
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
if (camera != null){
Camera.Parameters params = camera.getParameters();
camera.setParameters(params);
}
else {
Toast.makeText(getApplicationContext(), "Camera not available!", Toast.LENGTH_LONG).show();
finish();
}
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
if (previewRunning){
camera.stopPreview();
}
Camera.Parameters p = camera.getParameters();
List<Camera.Size> sizes = p.getSupportedPreviewSizes();
Camera.Size cs = sizes.get(0);
p.setPreviewSize(cs.width, cs.height);
camera.setParameters(p);

try {
camera.setPreviewDisplay(holder);
camera.startPreview();
previewRunning = true;
}
catch (IOException e) {
Log.e(TAG,e.getMessage());
e.printStackTrace();
}
}

private MediaRecorder mediaRecorder;
private final int maxDurationInMs = 20000;
private final long maxFileSizeInBytes = 500000;
private final int videoFramesPerSecond = 20;

public boolean startRecording(){
try {
camera.unlock();

mediaRecorder = new MediaRecorder();

mediaRecorder.setCamera(camera);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);

mediaRecorder.setMaxDuration(maxDurationInMs);

File tempFile = new File(getCacheDir(),"test.mp4");
mediaRecorder.setOutputFile(tempFile.getPath());

mediaRecorder.setVideoFrameRate(videoFramesPerSecond);
mediaRecorder.setVideoSize(surfaceView.getWidth(), surfaceView.getHeight());

mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);

mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());

mediaRecorder.setMaxFileSize(maxFileSizeInBytes);

mediaRecorder.prepare();
mediaRecorder.start();

return true;
} catch (IllegalStateException e) {
Log.e(TAG,e.getMessage());
e.printStackTrace();
return false;
} catch (IOException e) {
Log.e(TAG,e.getMessage());
e.printStackTrace();
return false;
}
}

public void stopRecording(){
mediaRecorder.stop();
camera.lock();
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
previewRunning = false;
camera.release();
}

日志是

 08-31 02:20:11.781: E/MediaRecorder(14519): start failed: -19
08-31 02:20:11.781: D/AndroidRuntime(14519): Shutting down VM
08-31 02:20:11.781: W/dalvikvm(14519): threadid=1: thread exiting with uncaught exception (group=0x416c9700)
08-31 02:20:11.781: E/AndroidRuntime(14519): FATAL EXCEPTION: main
08-31 02:20:11.781: E/AndroidRuntime(14519): java.lang.RuntimeException: start failed.
08-31 02:20:11.781: E/AndroidRuntime(14519): at android.media.MediaRecorder.start(Native Method)
08-31 02:20:11.781: E/AndroidRuntime(14519): at com.example.cameratest.MainActivity.startRecording(MainActivity.java:135)
08-31 02:20:11.781: E/AndroidRuntime(14519): at com.example.cameratest.MainActivity$2.onClick(MainActivity.java:61)
08-31 02:20:11.781: E/AndroidRuntime(14519): at android.view.View.performClick(View.java:4240)
08-31 02:20:11.781: E/AndroidRuntime(14519): at android.view.View$PerformClick.run(View.java:17721)
08-31 02:20:11.781: E/AndroidRuntime(14519): at android.os.Handler.handleCallback(Handler.java:730)
08-31 02:20:11.781: E/AndroidRuntime(14519): at android.os.Handler.dispatchMessage(Handler.java:92)
08-31 02:20:11.781: E/AndroidRuntime(14519): at android.os.Looper.loop(Looper.java:137)
08-31 02:20:11.781: E/AndroidRuntime(14519): at android.app.ActivityThread.main(ActivityThread.java:5103)
08-31 02:20:11.781: E/AndroidRuntime(14519): at java.lang.reflect.Method.invokeNative(Native Method)
08-31 02:20:11.781: E/AndroidRuntime(14519): at java.lang.reflect.Method.invoke(Method.java:525)
08-31 02:20:11.781: E/AndroidRuntime(14519): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
08-31 02:20:11.781: E/AndroidRuntime(14519): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-31 02:20:11.781: E/AndroidRuntime(14519): at dalvik.system.NativeStart.main(Native Method)

最佳答案

我找到了这个解决方案,它对我来说工作得很好,并解决了这个问题:)

对于 2.3+ 安卓:

只是改变:

mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));

到:

mediaRecorder.setProfile(CamcorderProfile.get(CameraID,CamcorderProfile.QUALITY_HIGH));

关于android - Media Recorder 在 android for camera 中启动失败,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18402649/

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