[mythtv-users] Fixed numbers for video devices

[Nick Morrott]

On 26/10/2007, Jos Hoekstra <joshoekstra at gmx.net> wrote:
> Hey,
>
> I've been using myth for quite a while now and I use it a lot with my
> roommates. Recently I've stumbled on a problem which is partly a mythtv
> problem.

Linux modules creating devices inconsistently is not a MythTV problem :)

> I'm using a PVR500 and 350 for recording TV, which gives me 3 video devices:
> /dev/video[0-2]
>
> Lately I got a webcam which I want to use for Zoneminder(looking forward
> to the ZM-plugin ;)), which works fine using the gspcav-driver.
> This one uses:
> /dev/video3
>
> All this works under FC6, until I reboot then the webcam gets
> /dev/video0 and the PVR's shift a number up.
>
> This would be ok if the cam is always connected, but it isn't so the
> nummbers will keep switching around and 1 channel less in mythtv.
>
> Is there a way to force the webcam to be loaded last after the PVR's are
> loaded?(because it seems to be loaded before the PVR's)

Why not amend your modprobe.conf so that ivtv starts numbering devices
from 1 (or 2). This should ensure your ivtv devices never take
/dev/video0, leaving it free at all times for the webcam.

See http://www.gossamer-threads.com/lists/mythtv/users/254392

> Or, alternatively, is there a way to force the webcam to load at a fixed
> number?
> Can this be done by a udev-rule?

Yes. The above link contains links to relevant udev pages.

-- 
Nick Morrott

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