Dear Robert, have you found solution for this issue?
I have the same problem now...
четверг, 6 августа 2009 г., 17:22:24 UTC+3 пользователь Robert написал:
>
>
> I tried various things to overcome the limitation of setPreviewDisplay
> ():
>
> - preserved the surface (sf), so mSurfaceHolder.getSurface() was not
> called again. Worked fine while the surface was visible, but once it
> was destroyed, sf.isValid() returned false, and prepare() failed
> again
>
> - tried to use the other 3 types of SURFACE_TYPE_*. Preview was not
> working, but video was being captured, until it needed to be
> initialized again, when prepare() failed
>
> - with these other 3 types of surface, I tried
> mSurfaceHolder.lockCanvas(), sf.lockCanvas(dirtyrect) and sf.freeze()
> in an attempt to keep the surface being destroyed
>
> Nothing has worked as expected :( Is there a way to keep a valid
> surface when the view is pushed to the background? Or, make
> setPreviewDisplay() accept a dummy surface?
>
> Thanks,
> Robert
>
>
> On Aug 5, 1:10 pm, Robert <ferob...@gmail.com> wrote:
> > 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
--
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
