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Hello Hello, I am doing a video stream through a camera connected to a Brooktree Corporation Bt878 card. This card enables the interconnection of 4 cameras that are distinguished through the channel (is only created a video device /dev/video).
However I can only access a camera at a time because the VLC locks the video device /dev/video.
There is a way to make the VLC does not run this lock?

The commands that I use are:

Camara 1:
vlc -vvv --color --noaudio v4l:// :v4l-vdev="/dev/video" :v4l-fps=12 :v4l-channel=0 --sout '#duplicate{dst="transcode{vcodec=DIV3,vb=256,scale=0.5,deinterlace}:standard{access=mmsh,mux=asfh,dst=:8001/CAM}"'

Camara 2:
vlc -vvv --color --noaudio v4l:// :v4l-vdev="/dev/video" :v4l-fps=12 :v4l-channel=1 --sout '#duplicate{dst="transcode{vcodec=DIV3,vb=256,scale=0.5,deinterlace}:standard{access=mmsh,mux=asfh,dst=:8002/CAM}"'

*** ERROR when the second process of VLC is launched ***

[00000343] v4l demuxer warning: I420 refused
[00000343] v4l demuxer error: chroma selection failed
[00000343] v4l demuxer error: cannot open audio device (Device or resource busy)
[00000343] main demuxer warning: no access_demux module matching "v4l" could be loaded
[00000327] main input debug: creating access 'v4l' path=''
[00000345] main access debug: looking for access2 module: 8 candidates
[00000345] vcdx access warning: Can't get file status for /dev/cdrom:
No such file or directory
[00000345] vcdx access warning: could not retrieve file info for `/dev/cdrom': No such file or directory
[00000345] vcdx access warning: can't open nrg image file /dev/cdrom for reading
[00000345] access_file access warning: : No such file or directory
[00000345] access_gnomevfs access warning: cannot parse MRL v4l:// or unsupported protocol
[00000345] main access warning: no access2 module matching "v4l" could be loaded
[00000327] main input error: no suitable access module for `v4l://'
[00000330] main private debug: destroying chain... (name=duplicate)
[00000330] stream_out_duplicate private debug: closing a duplication
[00000332] main private debug: destroying chain... (name=transcode)
[00000335] main private debug: destroying chain... (name=standard)
[00000341] mux_asf private debug: Asf muxer closed
[00000337] access_output_http private warning: HTTP sout access cannot seek
[00000341] main private debug: removing module "mux_asf"
[00000340] main http server debug: thread 3021319056 joined (network/httpd.c:1134)
[00000340] main http server debug: HTTP host removed
[00000339] main http server debug: no host left, stopping httpd
[00000337] access_output_http private debug: Close
[00000337] main private debug: removing module "access_output_http"
[00000335] main private debug: removing module "stream_out_standard"
[00000335] main private debug: destroying chain done
[00000332] main private debug: removing module "stream_out_transcode"
[00000332] main private debug: destroying chain done
[00000330] main private debug: removing module "stream_out_duplicate"
[00000330] main private debug: destroying chain done
[00000327] main input debug: thread 3031808912 joined (input/input.c:412)
[00000317] main playlist: nothing to play
status change: ( stop state: 0 )


*** ERROR when it tries to access the device ***

[root@FBS ~]# cat /dev/video
cat: /dev/video: Device or resource busy

AFAIK you can capture more than one channel with the same instance of VLC. Using vlm you can do it.
It won't remove the lock but you can do what you want
(see http://wiki.videolan.org/Documentation: ... le_streams)