root@dreambox:/tmp$ hyperion-v4l2 --screenshot
hyperion-v4l2:
        version   : (detached from fb413cd) (GitHub-66bef6b/fb413cd-1566231780
        build time: Apr  7 2020 11:02:57
V4L2GRABBER INFO: width=640 height=480
V4L2GRABBER INFO: pixel format=YUYV
V4L2GRABBER INFO: signal threshold set to: {0,0,0}
V4L2GRABBER INFO: started
V4L2GRABBER ERROR: Frame too small: 0 != 614400
V4L2GRABBER ERROR: Frame too small: 0 != 614400
V4L2GRABBER ERROR: Frame too small: 0 != 614400
V4L2GRABBER ERROR: Frame too small: 0 != 614400
V4L2GRABBER INFO: stopped