I am still loking for the solution ? any solution yet ? On Tuesday, March 27, 2012 12:09:08 PM UTC-4, Qianqian Fang wrote: > > hi > > I am working on a real-time video processing project. I used > setPreviewCallbackWithBuffer() and display both the preview image and > the processed image on SurfaceViews. Now, I'd like to record video at > the same time. I read from some posts that the video recording > involves low-level io that is not in conflict with the preview buffer. > > I took some sample code from the second post of this link to do the > video recording: > > http://stackoverflow.com/questions/1817742/android-video-recording-sample > > however, after merging it with my camera > setPreviewCallbackWithBuffer() code, I kept getting "MediaRecorder: > start called in an invalid state 4" when I tried to call mrec.start(). > Both the initRecorder() and prepareRecorder() ran fine when the > surface is created. > > Anyone know what might be causing this error? the MediaRecorder object > does share the same camera object that is used for buffered preview. > > thanks > > Qianqian
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