预览的尺寸和视频录制的尺寸是一样的:
mCamera.setPreviewSize(UVCCamera.DEFAULT_PREVIEW_WIDTH,
UVCCamera.DEFAULT_PREVIEW_HEIGHT, PREVIEW_MODE);
private static final int VIDEO_WIDTH = UVCCamera.DEFAULT_PREVIEW_WIDTH;
private static final int VIDEO_HEIGHT = UVCCamera.DEFAULT_PREVIEW_HEIGHT;
final MediaFormat format = MediaFormat.createVideoFormat(MIME_TYPE,
VIDEO_WIDTH, VIDEO_HEIGHT);