Hello all,
I am building a camera app, where photos and videos are continuously
being captured and saved to the SD card. The videos are short (few
minutes), and their length are preset with setMaxDuration(). When
MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED is reached, the
video is saved, and a new sequence is initialized with something like:
mMediaRecorder = new MediaRecorder();
mMediaRecorder.setVideoSource
(MediaRecorder.VideoSource.CAMERA);
mMediaRecorder.setOutputFormat
(MediaRecorder.OutputFormat.THREE_GPP);
mMediaRecorder.setVideoFrameRate(20);
mMediaRecorder.setVideoSize(176, 144);
mMediaRecorder.setVideoEncoder
(MediaRecorder.VideoEncoder.H263);
mMediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());
mMediaRecorder.setMaxDuration(1000 * Integer.valueOf
(videoLength));
mMediaRecorder.setOnInfoListener(videoInfoListener);
mMediaRecorder.setOutputFile("/sdcard/test.3gp");
mMediaRecorder.prepare();
mMediaRecorder.start();
I also have a SurfaceHolder mSurfaceHolder, set up like:
mPreview = (SurfaceView) findViewById(R.id.preview);
mSurfaceHolder = mPreview.getHolder();
mSurfaceHolder.addCallback(this);
mSurfaceHolder.setType
(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
public void surfaceCreated(SurfaceHolder holder) {
mSurfaceHolder = holder;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w,
int h) {
}
public void surfaceDestroyed(SurfaceHolder holder) {
mSurfaceHolder = null;
}
The whole process works fine, while the main activity is in the
foreground. But, when I go to another activity (e.g. settings), the
video recording works in the background only until max duration is
reached. The file is saved, but a new sequence can not be started
because prepare() fails. setPreviewDisplay() needs to be there, but it
doesn't like not having a proper surface to attach to.
I tried to use a dummy Surface, a dummy SurfaceHolder, or reuse the
Camera with mMediaRecorder.setCamera(), but nothing works. Is there a
way to initialize MediaRecorder in the background?
Thanks and regards,
Robert
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