Is it possible the following patch in driver/v4l.c file? It handles the case 
were yuv is supported by a driver implementing offscreen image but doing it 
without overlay (the overlay flag is not set). In that case, the stop method of 
the offscreen image must be called because some device on the video card is 
converting and scaling yuv to rgb and blitting directly to the frame buffer 
continuously. 
 
*************** 
*** 495,501 **** 
            if (-1 == ioctl(V4L_FD, VIDIOCCAPTURE, &zero)) 
                perror("ioctl VIDIOCCAPTURE(0)"); 
            pPPriv->VideoOn = VIDEO_RECLIP; 
!       } 
      } else { 
        /* video stop - turn off and free everything */ 
        if (VIDEO_YUV == pPPriv->VideoOn) { 
--- 495,504 ---- 
            if (-1 == ioctl(V4L_FD, VIDIOCCAPTURE, &zero)) 
                perror("ioctl VIDIOCCAPTURE(0)"); 
            pPPriv->VideoOn = VIDEO_RECLIP; 
!       } else if (VIDEO_YUV == pPPriv->VideoOn && 
!                    (pPPriv->myfmt->flags & VIDEO_OVERLAID_IMAGES) == 0) { 
!             pPPriv->myfmt->stop(pPPriv->surface); 
!         } 
      } else { 
        /* video stop - turn off and free everything */ 
        if (VIDEO_YUV == pPPriv->VideoOn) {