Hi Gilles, On Friday 28 October 2011 03:31:53 Gilles Gigan wrote: > Hi, > I would like to know what is the correct way to switch the current > video input during capture on a card with a single BT878 chip and 4 > inputs > (http://store.bluecherry.net/products/PV%252d143-%252d-4-port-video-captur > e-card-%2830FPS%29-%252d-OEM.html). I tried doing it in two ways: > - using VIDIOC_S_INPUT to change the current input. While this works, > the next captured frame shows video from the old input in its top half > and video from the new input in the bottom half. > - I tried setting the input field to the new input and flags to > V4L2_BUF_FLAG_INPUT in the struct v4l2_buffer passed to VIDIOC_QBUF > when enqueuing buffers. However, when doing so, the ioctl fails > altogether, and I cannot enqueue any buffers with the > V4L2_BUF_FLAG_INPUT flag set. V4L2_BUF_FLAG_INPUT is (or at least should be) deprecated. It isn't supported by mainline drivers and was a mistake in the first place. > Is there another way of doing it ? or is there a way to synchronise > the input change (when using VIDIOC_S_INPUT) so it happens in between > 2 frames and produces a clean switch ? You will need hardware support for that. -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
