[PLUG-AV] DVSWITCH V4L Support

[Euan de Kock]

Just had a look at the git commits for dvswitch and spotted this comment 
from 11-Jan-2014:

Implement a generic V4L2 dvsource

     

     dvgrab can read from a device using video4linux, if that device supports

     a DV output method. Many such devices do not.

     

     This commit adds a "v4l2-raw" mode which calls avconv rather than

     dvgrab; while requiring significantly more resources than dvgrab on the

     dvsource host, this then allows for using any V4L2-supported device as

     an input to dvswitch.


I haven't tested it yet to see wether it's more efficient than what we 
are currently using, but at least it's native to dvswitch.

FYI avconv is part of libav (which is a fork of ffmpeg afaik)

Regards,

Euan.
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