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Old 11-02-2007, 02:52 PM   #1
Registered: Mar 2003
Location: Iowa, US
Distribution: Mint
Posts: 174

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Simultaneous access to bttv device

The Setup:
I am using ffserver to feed a live flv stream from my ATI-TV Wonder (bttv) to a website. My system is on Gentoo with the 2.6.22-r8, AMD64 x2. I am also using scanimage to take periodic stills from the same /dev/video0 device. The card works great and this was running flawlessly a few months ago.

The Problem:
I did a system update which upgraded my kernel from 2.6.20? as well an sane and several (most) other packages. Now I can only access the /dev/video0 device by one app at a time. The common failure is having ffserver running and scanimage runs to grap the still. The error I get is below:

scanimage: sane_start: Invalid argument

I have tried just about everything that I can find on the web to solve this. From everything I can find, v4l2 (bttv should support this) allows simultaneous access. The strange thing is that it use to! The kernel update was performed via make oldconfig and I verified that everything in the old kernel was still supported in the new one.

Any ideas are welcome, and thanks for the help in advance. I expect there is a simple solution to this, but I have exhausted my knowledge without finding it.



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