Em 26-09-2011 16:59, Thomas Petazzoni escreveu:
> Hello Laurent,
>
> Le Mon, 26 Sep 2011 21:02:48 +0200,
> Laurent Pinchart <laurent.pinch...@ideasonboard.com> a écrit :
>
>> Are you using the MMAP or USERPTR capture method ? If using MMAP, can
>> you try (as a test only) to unmap the buffer before queueing it and
>> to remap it after dequeuing it ?
>
> So far, we have used VLC, Cheese, or a simple OpenCV based application
> to test the V4L2 device on our ARM platform, and I have no idea which
> capture method those are using. Is there a very simple V4L test
> application that we could use to hack the buffer unmap/remap trick
> you're suggesting as a test ?
The simplest application is the v4l2grab util:
http://git.linuxtv.org/v4l-utils.git/blob/HEAD:/contrib/test/v4l2grab.c
it uses libv4l to convert to RGB and outputs a series of ppm images. By
generating one image per frame, it is easy to check artifacts on each
image.
>
> Regards,
>
> Thomas
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
