Re: How to force the device assignment with V4l V2.0?

[Ian Pickworth <ian@pickworth.me.uk>]

Ian Pickworth wrote:
> Pádraig Brady wrote:
>   
>> Ian Pickworth wrote:
>>     
>>> I have two devices - a CX88 based Hauppauge TV PCI card, and a USB
>>> webcam. In the "old" style drivers, I could force the loading of the two
>>> modules (cx8800 and gspca) in a set sequence, using blacklist and
>>> modules.autoload. This is enough to ensure that cx88 gets /dev/video0,
>>> and the usb webcam gets /dev/video1.
>>>       
>> I use udev rules to give persistent names.
>>
>> Here is my /etc/udev/rules.d/video.rules file,
>> which creates /dev/webcam and /dev/tvtuner as appropriate.
>>
>> KERNEL=="video*" SYSFS{name}=="USB2.0 Camera", NAME="video%n", SYMLINK+="webcam"
>> KERNEL=="video*" SYSFS{name}=="em28xx*", NAME="video%n", SYMLINK+="tvtuner"
>>
>> To find distinguishing attributes to match on use:
>>
>> echo /sys/class/video4linux/video* | xargs -n1 udevinfo -a -p
>>     
>
> I did think about that, but the problem is that applications want to see
> /dev/video(n) style names. Especially TV Time that (I think) uses
> /dev/video - set to link to /dev/video0 by the standard udev rules.
>   
A bit more research and I can see how to set TVTIME to use a different

device:
    In ~/.tvtime/tvtime.xml set this line:
    <option name="V4LDevice" value="/dev/v4l/video0"/>
    or whatever the device is you want.

So I can have a go at the udev solution - I'll try it a bit later.

Thanks
Regards
Ian


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