Em 26-09-2011 16:59, Thomas Petazzoni escreveu: > Hello Laurent, > > Le Mon, 26 Sep 2011 21:02:48 +0200, > Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> 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 majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
