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





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