我正在尝试使用MediaRecorder在我的一个活动中录制前置摄像头的音频。部分代码如下所示。如果我打开相机，它运行良好。但是，如果我打开前置摄像头，没有运行时错误，但我无法打开输出MP4
CameraService.java
的一部分@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d("TAG", "======= service in onStartCommand");
if (Util.checkCameraHardware(this)) {
mCamera = Util.getCameraInstance();
if (mCamera != null) {
SurfaceView sv = new SurfaceView(this);
WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
WindowManager.LayoutParams params = new WindowManager.LayoutParams(1, 1,
WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
PixelFormat.TRANSLUCENT);
SurfaceHolder sh = sv.getHolder();
sv.setZOrderOnTop(true);
sh.setFormat(PixelFormat.TRANSPARENT);
sh.addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
Camera.Parameters params = mCamera.getParameters();
mCamera.setParameters(params);
Camera.Parameters p = mCamera.getParameters();
List<Camera.Size> listSize;
listSize = p.getSupportedPreviewSizes();
Camera.Size mPreviewSize = listSize.get(2);
Log.v("TAG", "preview width = " + mPreviewSize.width
+ " preview height = " + mPreviewSize.height);
p.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
listSize = p.getSupportedPictureSizes();
Camera.Size mPictureSize = listSize.get(2);
Log.v("TAG", "capture width = " + mPictureSize.width
+ " capture height = " + mPictureSize.height);
p.setPictureSize(mPictureSize.width, mPictureSize.height);
mCamera.setParameters(p);
try {
mCamera.setPreviewDisplay(holder);
} catch (IOException e) {
e.printStackTrace();
}
mCamera.startPreview();
mCamera.unlock();
mMediaRecorder = new MediaRecorder();
mMediaRecorder.setCamera(mCamera);
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mMediaRecorder.setProfile(CamcorderProfile.get(1,CamcorderProfile.QUALITY_HIGH));
mMediaRecorder.setOutputFile(Util.getOutputMediaFile(Util.MEDIA_TYPE_VIDEO).getPath());
mMediaRecorder.setPreviewDisplay(holder.getSurface());
try {
mMediaRecorder.prepare();
} catch (IllegalStateException e) {
Log.d("TAG", "====== IllegalStateException preparing MediaRecorder: " + e.getMessage());
} catch (IOException e) {
Log.d("TAG", "====== IOException preparing MediaRecorder: " + e.getMessage());
}
mMediaRecorder.start();
Log.d("TAG", "========= recording start");
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
mMediaRecorder.stop();
mMediaRecorder.reset();
mMediaRecorder.release();
mMediaRecorder=null;
mCamera.stopPreview();
mCamera.release();
Log.d("TAG", "========== recording finished.");
}
}, 10000);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
});
wm.addView(sv, params);
} else {
Log.d("TAG", "==== get Camera from service failed");
}
} else {
Log.d("TAG", "==== There is no camera hardware on device.");
}
return super.onStartCommand(intent, flags, startId);
}
Util.java
的一部分public static Camera getCameraInstance() {
Camera c = null;
try {
c = Camera.open(1);
} catch (Exception e) {
Log.d("TAG", "Open camera failed: " + e);
}
return c;
}
更新 我更改了下面显示的两条线，切换到后置摄像头并录制好视频。
CameraService.java mMediaRecorder.setProfile(CamcorderProfile.get(1,CamcorderProfile.QUALITY_HIGH)); =＆gt; mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
Util.java c = Camera.open(1); =＆gt; c = Camera.open();
答案 0 :(得分：0)
一旦我在我的情况下得到相同的错误，我设置视频大小或错误。
protected void startRecording() {
try {
mrec = new MediaRecorder();
mCamera.unlock();
mrec.setCamera(mCamera);
//Set audio source
mrec.setAudioSource(MediaRecorder.AudioSource.MIC);
//set video source
mrec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
//set output format
mrec.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
int width = 320;
int height = 240;
try {
//get the available sizes of the video
List<Size> tmpList = getSupportedVideoSizes();
final List<Size> sizeList = new Vector<Size>();
// compare the apsect ratio of the candidate sizes against the
// real ratio
Double aspectRatio = (Double.valueOf(getWindowManager()
.getDefaultDisplay().getHeight()) / getWindowManager()
.getDefaultDisplay().getWidth());
for (int i = tmpList.size() - 1; i > 0; i--) {
Double tmpRatio = Double.valueOf(tmpList.get(i).height)
/ tmpList.get(i).width;
if (EnableLog.LOG_TAG) {
Log.e("Width & height", tmpList.get(i).width + " x "
+ tmpList.get(i).height);
}
if (Math.abs(aspectRatio - tmpRatio) < .15) {
width = tmpList.get(i).width;
height = tmpList.get(i).height;
sizeList.add(tmpList.get(i));
}
}
} catch (Exception e) {
e.printStackTrace();
}
// set the size of video.
// If the size is not applicable then throw the media recorder stop
// -19 error
mrec.setVideoSize(width, height);
// Set the video encoding bit rate this changes for the high, low.
// medium quality devices
mrec.setVideoEncodingBitRate(1700000);
//Set the video frame rate
mrec.setVideoFrameRate(30);
//set audio encoder format
mrec.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
//set video encoder format
mrec.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
//Show the display preview
mrec.setPreviewDisplay(surfaceHolder.getSurface());
//output file path
mrec.setOutputFile(output_path);
mrec.prepare();
mrec.start();
} catch (IllegalStateException e) {
Crashlytics.logException(e);
e.printStackTrace();
} catch (IOException e) {
Crashlytics.logException(e);
e.printStackTrace();
}
}
public List<Size> getSupportedVideoSizes() {
if (params.getSupportedVideoSizes() != null) {
return params.getSupportedVideoSizes();
} else {
// Video sizes may be null, which indicates that all the supported
// preview sizes are supported for video recording.
return params.getSupportedPreviewSizes();
}
}
这对我有用。试试吧。也许它会有所帮助。我不确定试试这个。