Rick Romero wrote
Are you running two instances of motion?
Yes.
I'm attempting to do the
same with a bttv card with 4 inputs, and up to 4 copies of motion..
This is a very different problem since the bttv card is not a USB
device. This doesn't appear to be a generic V4L problem but restricted
to USB V4L devices.
I believe the limitation arises (as someone pointed out) from the first
USB camera allocating the entire USB bus bandwidth when a read is
performed. If a second read is started on a second camera, an error is
returned indicating that the resource is completely used.
It seems to me that that there should be some way for multiple USB
cameras to work on the same platform without using userland semaphores
as I have done.
Rich
