On Tuesday 12 February 2008, Nathanael Galpin wrote: > I've run into an error using the UVC driver with V4L2 to stream data from > webcams. Everything works fine the first time around. I allocate buffers, > enque them and then stream data from the camera. However, after stopping > the camera and unmapping all the buffers, a subsequent attempt to map > buffers and start streaming fails. > > The only way I've found to get around this is to close the file handle to > the camera and open the device file again. Is this the way it's supposed to > work or am I doing something wrong? I'm using the latest UVC driver from > SVN on Fedora 8.
That's definitely not how this is supposed to work. Your code is probably missing something. > If anyone wants I'll post a small sample app demonstrating the problem. That would be easier. Without source code I can only guess, and that's not what I'm best at. > On a related note, whenever an errenous request is made to the camera, it > goes into an error state and won't accept any other commands. Is there a > way to clear this error state, or should I just close and reopen the device > file? Which camera are you talking about ? What kind of erroneous request ? Please provide more details along with kernel log messages if available. Best regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
