[mythtv-users] HDPVR cat video0 input output error. Everything seems in place

[Mark Greenwood]

On 30 Oct 2012, at 21:23, Mark wrote:

> I haven't seen this error for a while and am not finding much in googling it for assistance.
> I am wondering if this is a module problem in the kernel as it doesnt make much sense.
> 
> New Mythbox on F17
> I know the HDPVR works as its fine on another F17 ( old ) box.
> 
> Problem: cat /dev/video0 > /tmp/vid.avi
> 
> Info:
> ls -al /dev/video0
> crw-rw----+ 1 root video 81, 0 Oct 30 15:19 /dev/video0

Well, it's a guess but that + on the end of the attributes means it has an ACL (Access Control List) associated with it - it's an extension to the standard Linux permissions. Doing 

getfacl /dev/video0 will show you the true permissions. 

To determine whether it's an ACL problem you can remove the ACL with setfacl -b.

Mark

> 
> lsmod |grep hdpvr
> hdpvr                  32337  0
> v4l2_common            15099  1 hdpvr
> videodev              119976  2 hdpvr,v4l2_common
> i2c_core               38314  5 i2c_i801,hdpvr,nvidia,v4l2_common,videodev
> 
> hdpvr 2-1.6:1.0: firmware version 0x12 dated May  7 2009 23:27:43
> [80987.350493] hdpvr 2-1.6:1.0: device now attached to video0
> [80987.350519] usbcore: registered new interface driver hdpvr
> 
> So it all looks good.  I cant cat the video device as root or anyone in the video group.
> 
> Any ideas on what else I can check?
> 
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