The VideoLAN Forums

hi. i have been able to make some good progress on streaming a web cam both via the gui and command line.

so i've added a second web cam to the same pc. when both web cams are in, i can access the local gui and get a picture on each one separately by first using /dev/video0, stopping that capture, then doing a separate capture also via the gui but this time on /dev/video1. that works as expected.

also i can start 2 instances of vlc and access the both webcams at the same time via manual gui use of the capture input option for each on in each of the 2 vlc instances. this also works fine.

but, when i try to stream them both at the same time i never can. each time i get an error. i have tried this both by starting 2 separate instances of vlc. and also by running it via vlm.

can you please help?

here is my vlm config file:

new channel1 broadcast enabled
setup channel1 input v4l2://dev/video0:norm=secam:frequency=543250:size=640x480:channel=0:adev=/dev/video0:audio=0
setup channel1 output #transcode{vcodec=mp4v,vb=800,scale=1,acodec=mp4a,ab=128,channels=2}:standard{access=http,mux=ogg,dst=192.168.1.5:1234}

new channel2 broadcast enabled
setup channel2 input v4l2://dev/video1:norm=secam:frequency=543250:size=640x480:channel=0:adev=/dev/video1:audio=0
setup channel2 output #transcode{vcodec=mp4v,vb=800,scale=1,acodec=mp4a,ab=128,channels=2}:standard{access=http,mux=ogg,dst=192.168.1.5:1235}

control channel1 play
control channel2 play

usb devices:

glok@glok:~/Documents$ lsusb
Bus 005 Device 004: ID 046d:09a1 Logitech, Inc.
Bus 005 Device 003: ID 046d:09a1 Logitech, Inc.
Bus 005 Device 001: ID 0000:0000
Bus 004 Device 002: ID 413c:02b0 Dell Computer Corp.
Bus 004 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000



and here is the error log:

[00000362] main http server warning: cannot add '/dialogs/vlm' (url already defined)
[00000384] http interface debug: file=/usr/local/share/vlc/http/dialogs/footer (url=/dialogs/footer)
[00000362] main http server warning: cannot add '/dialogs/footer' (url already defined)
[00000384] http interface debug: file=/usr/local/share/vlc/http/dialogs/input (url=/dialogs/input)
[00000362] main http server warning: cannot add '/dialogs/input' (url already defined)
[00000384] http interface debug: file=/usr/local/share/vlc/http/vlm_export.html (url=/vlm_export.html)
[00000362] main http server warning: cannot add '/vlm_export.html' (url already defined)
[00000384] http interface debug: file=/usr/local/share/vlc/http/favicon.ico (url=/favicon.ico)
[00000362] main http server warning: cannot add '/favicon.ico' (url already defined)
[00000384] http interface debug: file=/usr/local/share/vlc/http/style.css (url=/style.css)
[00000362] main http server warning: cannot add '/style.css' (url already defined)
[00000384] http interface error: cannot find any file in directory /usr/local/share/vlc/http
[00000367] main http server debug: httpd_HostDelete: host still used
[00000374] [Media: channel1] v4l2 demux debug: Available control: Saturation (980902)
[00000374] [Media: channel1] v4l2 demux debug: integer control
[00000374] [Media: channel1] v4l2 demux debug: valid values: 0 to 255 by steps of 1
[00000374] [Media: channel1] v4l2 demux debug: default value: 28
[00000374] [Media: channel1] v4l2 demux debug: current value: 28
[00000386] [Media: channel2] v4l2 access warning: unknown option norm=secam
[00000386] [Media: channel2] v4l2 access warning: unknown option frequency=543250
[00000386] [Media: channel2] v4l2 access warning: unknown option size=640x480
[00000386] [Media: channel2] v4l2 access warning: unknown option channel=0
[00000386] [Media: channel2] v4l2 access warning: unknown option audio=0
[00000386] [Media: channel2] v4l2 access debug: main device='dev/video1'
[00000386] [Media: channel2] v4l2 access debug: trying device 'dev/video1' as video
[00000386] [Media: channel2] v4l2 access error: cannot open video device (No such file or directory)
[00000386] [Media: channel2] v4l2 access debug: opening '/dev/video0' as video
[00000374] [Media: channel1] v4l2 demux debug: Available control: White Balance Temperature, Auto (98090c)
[00000374] [Media: channel1] v4l2 demux debug: boolean control
[00000374] [Media: channel1] v4l2 demux debug: default value: 1
[00000374] [Media: channel1] v4l2 demux debug: current value: 1
[00000386] [Media: channel2] v4l2 access debug: V4L2 device: UVC Camera (046d:09a1) using driver: uvcvideo (version: 0.1.0) on usb-0000:00:1d.7-1
[00000386] [Media: channel2] v4l2 access debug: the device has the capabilities: (X) Video Capure, ( ) Audio, ( ) Tuner
[00000386] [Media: channel2] v4l2 access debug: supported I/O methods are: (X) Read/Write, (X) Streaming, ( ) Asynchronous
[00000386] [Media: channel2] v4l2 access debug: video input 0 (Camera 1) has type: External analog input *
[00000386] [Media: channel2] v4l2 access debug: device supports chroma MJPG [MJPEG, MJPG]
[00000386] [Media: channel2] v4l2 access debug: device supports size 160x120
[00000386] [Media: channel2] v4l2 access debug: device supports size 176x144
[00000386] [Media: channel2] v4l2 access debug: device supports size 320x240
[00000386] [Media: channel2] v4l2 access debug: device supports size 352x288
[00000386] [Media: channel2] v4l2 access debug: device supports size 640x480
[00000386] [Media: channel2] v4l2 access debug: device supports size 960x720
[00000386] [Media: channel2] v4l2 access debug: device supports chroma YUY2 [YUV 4:2:2 (YUYV), YUYV]
[00000386] [Media: channel2] v4l2 access debug: device supports size 160x120
[00000386] [Media: channel2] v4l2 access debug: device supports size 176x144
[00000386] [Media: channel2] v4l2 access debug: device supports size 320x240
[00000386] [Media: channel2] v4l2 access debug: device supports size 352x288
[00000386] [Media: channel2] v4l2 access debug: device supports size 640x480
[00000386] [Media: channel2] v4l2 access debug: device supports size 960x720
[00000386] [Media: channel2] v4l2 access debug: device supports size 1280x960
[00000386] [Media: channel2] v4l2 access debug: device supports chroma YUYV [YUV 4:2:2 (YUYV), YUYV]
[00000386] [Media: channel2] v4l2 access debug: device supports size 160x120
[00000386] [Media: channel2] v4l2 access debug: device supports size 176x144
[00000386] [Media: channel2] v4l2 access debug: device supports size 320x240
[00000386] [Media: channel2] v4l2 access debug: device supports size 352x288
[00000386] [Media: channel2] v4l2 access debug: device supports size 640x480
[00000386] [Media: channel2] v4l2 access debug: device supports size 960x720
[00000386] [Media: channel2] v4l2 access debug: device supports size 1280x960
[00000386] [Media: channel2] v4l2 access debug: device supports chroma RV24 [RGB3, RGB3]
[00000386] [Media: channel2] v4l2 access debug: device supports size 160x120
[00000386] [Media: channel2] v4l2 access debug: device supports size 176x144
[00000386] [Media: channel2] v4l2 access debug: device supports size 320x240
[00000386] [Media: channel2] v4l2 access debug: device supports size 352x288
[00000386] [Media: channel2] v4l2 access debug: device supports size 640x480
[00000386] [Media: channel2] v4l2 access debug: device supports size 960x720
[00000386] [Media: channel2] v4l2 access debug: device supports size 1280x960
[00000386] [Media: channel2] v4l2 access debug: device supports chroma RV24 [BGR3, BGR3]
[00000386] [Media: channel2] v4l2 access debug: device supports size 160x120
[00000386] [Media: channel2] v4l2 access debug: device supports size 176x144
[00000386] [Media: channel2] v4l2 access debug: device supports size 320x240
[00000386] [Media: channel2] v4l2 access debug: device supports size 352x288
[00000386] [Media: channel2] v4l2 access debug: device supports size 640x480
[00000386] [Media: channel2] v4l2 access debug: device supports size 960x720
[00000386] [Media: channel2] v4l2 access debug: device supports size 1280x960
[00000386] [Media: channel2] v4l2 access debug: device supports chroma I420 [YU12, YU12]
[00000386] [Media: channel2] v4l2 access debug: device supports size 160x120
[00000386] [Media: channel2] v4l2 access debug: device supports size 176x144
[00000386] [Media: channel2] v4l2 access debug: device supports size 320x240
[00000386] [Media: channel2] v4l2 access debug: device supports size 352x288
[00000386] [Media: channel2] v4l2 access debug: device supports size 640x480
[00000386] [Media: channel2] v4l2 access debug: device supports size 960x720
[00000386] [Media: channel2] v4l2 access debug: device supports size 1280x960
[00000386] [Media: channel2] v4l2 access error: cannot set input (Device or resource busy)
[00000386] [Media: channel2] main access warning: no access module matching "v4l2" could be loaded
[00000386] [Media: channel2] main access debug: TIMER module_Need() : 18.896 ms - Total 18.896 ms / 1 intvls (Avg 18.896 ms)
[00000355] [Media: channel2] main input error: open of `v4l2://dev/video1:norm=secam:frequency=543250:size=640x480:channel=0:adev=/dev/video1:audio=0' failed: could not create access
[00000361] main stream out debug: destroying chain... (name=transcode)
[00000366] main stream out debug: destroying chain... (name=standard)
[00000379] mux_ogg mux: Close
[00000379] main mux debug: removing module "mux_ogg"
[00000373] main http server debug: waitpipe: object killed
[00000373] main http server debug: thread ended
[00000373] main http server debug: thread 2981014416 joined (network/httpd.c:1164)
[00000373] main http server debug: HTTP host removed
[00000370] access_output_http access out debug: Close
[00000370] main access out debug: removing module "access_output_http"
[00000366] main stream out debug: removing module "stream_out_standard"
[00000366] main stream out debug: destroying chain done
[00000374] [Media: channel1] v4l2 demux debug: Available control: Gain (980913)
[00000374] [Media: channel1] v4l2 demux debug: integer control
[00000374] [Media: channel1] v4l2 demux debug: valid values: 0 to 255 by steps of 1
[00000374] [Media: channel1] v4l2 demux debug: default value: 0
[00000374] [Media: channel1] v4l2 demux debug: current value: 0
[00000361] main stream out debug: removing module "stream_out_transcode"
[00000361] main stream out debug: destroying chain done
[00000374] [Media: channel1] v4l2 demux debug: Available control: Power Line Frequency (980918)
[00000374] [Media: channel1] v4l2 demux debug: menu control
[00000374] [Media: channel1] v4l2 demux debug: 0: Disabled
[00000374] [Media: channel1] v4l2 demux debug: 1: 50 Hz
[00000374] [Media: channel1] v4l2 demux debug: 2: 60 Hz
[00000374] [Media: channel1] v4l2 demux debug: default value: 2
[00000374] [Media: channel1] v4l2 demux debug: current value: 2
[00000374] [Media: channel1] v4l2 demux debug: Available control: White Balance Temperature (98091a)
[00000374] [Media: channel1] v4l2 demux debug: integer control
[00000374] [Media: channel1] v4l2 demux debug: valid values: 0 to 10000 by steps of 10
[00000374] [Media: channel1] v4l2 demux debug: default value: 4000
[00000374] [Media: channel1] v4l2 demux debug: current value: 2519
[00000374] [Media: channel1] v4l2 demux debug: Available control: Sharpness (98091b)
[00000374] [Media: channel1] v4l2 demux debug: integer control
[00000374] [Media: channel1] v4l2 demux debug: valid values: 0 to 255 by steps of 1
[00000374] [Media: channel1] v4l2 demux debug: default value: 180
[00000374] [Media: channel1] v4l2 demux debug: current value: 180
[00000374] [Media: channel1] v4l2 demux debug: Available control: Backlight Compensation (98091c)
[00000374] [Media: channel1] v4l2 demux debug: integer control
[00000374] [Media: channel1] v4l2 demux debug: valid values: 0 to 2 by steps of 1
[00000374] [Media: channel1] v4l2 demux debug: default value: 1
[00000374] [Media: channel1] v4l2 demux debug: current value: 1
[00000374] [Media: channel1] v4l2 demux debug: Available private control: Exposure, Auto (9a0901)
[00000374] [Media: channel1] v4l2 demux debug: menu control
[00000374] [Media: channel1] v4l2 demux debug: 0: Auto Mode
[00000374] [Media: channel1] v4l2 demux debug: 1: Manual Mode
[00000374] [Media: channel1] v4l2 demux debug: 2: Shutter Priority Mode
[00000374] [Media: channel1] v4l2 demux debug: 3: Aperture Priority Mode
[00000374] [Media: channel1] v4l2 demux debug: default value: 3
[00000374] [Media: channel1] v4l2 demux debug: current value: 3
[00000384] qt4 interface error: Could not connect to X server
[00000384] skins2 interface error: Cannot open display
[00000384] skins2 interface error: cannot initialize OSFactory
[00000374] [Media: channel1] v4l2 demux debug: Available private control: Exposure (Absolute) (9a0902)
Remote control interface initialized. Type `help' for help.
[00000374] [Media: channel1] v4l2 demux debug: integer control
[00000374] [Media: channel1] v4l2 demux debug: valid values: 1 to 10000 by steps of 1
[00000374] [Media: channel1] v4l2 demux debug: default value: 166
[00000374] [Media: channel1] v4l2 demux debug: current value: 166
[00000374] [Media: channel1] v4l2 demux debug: Available private control: Exposure, Auto Priority (9a0903)
[00000374] [Media: channel1] v4l2 demux debug: boolean control
[00000374] [Media: channel1] v4l2 demux debug: default value: 0
[00000374] [Media: channel1] v4l2 demux debug: current value: 1
[00000374] [Media: channel1] v4l2 demux debug: Available private control: Privacy (9a0910)
[00000374] [Media: channel1] v4l2 demux debug: boolean control
[00000374] [Media: channel1] v4l2 demux debug: default value: 0
[00000384] main interface debug: using interface module "rc"
[00000384] main interface debug: TIMER module_Need() : 97.763 ms - Total 97.763 ms / 1 intvls (Avg 97.763 ms)
[00000384] main interface debug: thread started
[00000384] main interface debug: thread 2981014416 (interface) created at priority 0 (interface/interface.c:168)
[00000374] [Media: channel1] v4l2 demux debug: current value: 0
[00000355] [Media: channel2] main input debug: thread ended
[00000355] [Media: channel2] main input debug: thread 3027979152 joined (input/vlm.c:776)
[00000355] [Media: channel2] main input debug: TIMER input launching for '(null)' : 217.141 ms - Total 217.141 ms / 1 intvls (Avg 217.141 ms)
[00000374] [Media: channel1] v4l2 demux debug: supported frame intervals for I420, 320x240:
[00000374] [Media: channel1] v4l2 demux debug: supported frame interval: 1/30
[00000374] [Media: channel1] v4l2 demux debug: supported frame interval: 1/25
[00000374] [Media: channel1] v4l2 demux debug: supported frame interval: 1/20
[00000374] [Media: channel1] v4l2 demux debug: supported frame interval: 1/15
[00000374] [Media: channel1] v4l2 demux debug: supported frame interval: 1/10
[00000374] [Media: channel1] v4l2 demux debug: supported frame interval: 1/5
[00000374] [Media: channel1] v4l2 demux debug: added new video es I420 320x240
[00000349] [Media: channel1] main input debug: selecting program id=0
[00000374] [Media: channel1] v4l2 demux debug: opening '/dev/video0' as audio
[00000374] [Media: channel1] main demux debug: using access_demux module "v4l2"
[00000374] [Media: channel1] main demux debug: TIMER module_Need() : 554.651 ms - Total 554.651 ms / 1 intvls (Avg 554.651 ms)
[00000393] [Media: channel1] main packetizer debug: looking for packetizer module: 16 candidates
[00000393] [Media: channel1] main packetizer debug: using packetizer module "rawvideo"
[00000393] [Media: channel1] main packetizer debug: TIMER module_Need() : 4.915 ms - Total 4.915 ms / 1 intvls (Avg 4.915 ms)
[00000393] [Media: channel1] main packetizer debug: thread started
[00000393] [Media: channel1] main packetizer debug: thread 3027979152 (decoder) created at priority 0 (input/decoder.c:217)
[00000349] [Media: channel1] main input debug: starting in async mode
[00000349] [Media: channel1] main input debug: `v4l2://dev/video0:norm=secam:frequency=543250:size=640x480:channel=0:adev=/dev/video0:audio=0' successfully opened
[00000349] [Media: channel1] main input debug: control type=1
[00000350] [Media: channel1] main stream output debug: adding a new sout input (sout_input:0xb6a05070)
[00000351] [Media: channel1] stream_out_transcode stream out debug: creating video transcoding from fcc=`I420' to fcc=`mp4v'
[00000401] [Media: channel1] main decoder debug: looking for decoder module: 22 candidates
[00000401] [Media: channel1] main decoder debug: using decoder module "rawvideo"
[00000401] [Media: channel1] main decoder debug: TIMER module_Need() : 15.178 ms - Total 15.178 ms / 1 intvls (Avg 15.178 ms)
[00000402] [Media: channel1] main encoder debug: looking for encoder module: 5 candidates
[00000402] [Media: channel1] avcodec encoder debug: libavcodec initialized (interface 3352064 )
[00000402] [Media: channel1] avcodec encoder debug: removing common factors from framerate
(mpeg4@0x81724c0)
[00000402] [Media: channel1] avcodec encoder debug: found encoder MPEG-4 Video
[00000402] [Media: channel1] main encoder debug: using encoder module "avcodec"
[00000402] [Media: channel1] main encoder debug: TIMER module_Need() : 13.915 ms - Total 13.915 ms / 1 intvls (Avg 13.915 ms)
[00000402] [Media: channel1] main encoder debug: removing module "avcodec"
[00000351] [Media: channel1] stream_out_transcode stream out debug: decoder aspect is 576000:432000
[00000351] [Media: channel1] stream_out_transcode stream out debug: source pixel aspect is 1.000000:1
[00000351] [Media: channel1] stream_out_transcode stream out debug: scaled pixel aspect is 1.000000:1
[00000351] [Media: channel1] stream_out_transcode stream out debug: source 320x240, destination 320x240
[00000351] [Media: channel1] stream_out_transcode stream out debug: encoder aspect is 576000:432000
[00000351] [Media: channel1] stream_out_transcode stream out debug: destination (after video filters) 320x240
[00000402] [Media: channel1] main encoder debug: looking for encoder module: 5 candidates
[00000402] [Media: channel1] avcodec encoder debug: libavcodec already initialized
[00000402] [Media: channel1] avcodec encoder debug: removing common factors from framerate
(mpeg4@0x818b550)
[00000402] [Media: channel1] avcodec encoder debug: found encoder MPEG-4 Video
[00000402] [Media: channel1] main encoder debug: using encoder module "avcodec"
[00000402] [Media: channel1] main encoder debug: TIMER module_Need() : 5.114 ms - Total 5.114 ms / 1 intvls (Avg 5.114 ms)
[00000368] [Media: channel1] main mux debug: adding a new input
[00000368] [Media: channel1] mux_ogg mux debug: adding input
[00000368] [Media: channel1] mux_ogg mux debug: mp4v stream
[00000393] [Media: channel1] main packetizer debug: switching to sync mode
[00000368] [Media: channel1] mux_ogg mux debug: writing header
[00000368] [Media: channel1] mux_ogg mux debug: creating header for mp4v
[00000368] [Media: channel1] mux_ogg mux debug: writing extra data

there is a mistake in your command line.
it should be v4l2:///dev/video0 2/ for :// and 1 / for /dev

thank you.

so i changed my config file to this:

new channel1 broadcast enabled
setup channel1 input v4l2:///dev/video0:norm=secam:frequency=543250:size=640x480:channel=0:adev=/dev/video0:audio=0
setup channel1 output #transcode{vcodec=mp4v,vb=800,scale=1,acodec=mp4a,ab=128,channels=2}:standard{access=http,mux=ogg,dst=192.168.1.5:1234}

new channel2 broadcast enabled
setup channel2 input v4l2:///dev/video1:norm=secam:frequency=543250:size=640x480:channel=0:adev=/dev/video1:audio=0
setup channel2 output #transcode{vcodec=mp4v,vb=800,scale=1,acodec=mp4a,ab=128,channels=2}:standard{access=http,mux=ogg,dst=192.168.1.5:1235}

control channel1 play
control channel2 play


it made the errors go away. but now i get this when using a single vlc command with the ///'s:

[00000364] main input debug: `v4l2:///dev/video0:norm=secam:frequency=543250:size=640x480:channel=0:adev=/dev/video0:audio=0' gives access `v4l2' demux `' path `/dev/video0:norm=secam:frequency=543250:size=640x480:channel=0:adev=/dev/video0:audio=0'
[00000364] main input debug: creating demux: access='v4l2' demux='' path='/dev/video0:norm=secam:frequency=543250:size=640x480:channel=0:adev=/dev/video0:audio=0'
[00000376] main demux debug: looking for access_demux module: 1 candidate
[00000376] v4l2 demux warning: unknown option norm=secam
[00000376] v4l2 demux warning: unknown option frequency=543250
[00000376] v4l2 demux warning: unknown option size=640x480
[00000376] v4l2 demux warning: unknown option channel=0
[00000376] v4l2 demux warning: unknown option audio=0
[00000376] v4l2 demux debug: main device='/dev/video0'
[00000376] v4l2 demux debug: trying device '/dev/video0' as video
[00000376] v4l2 demux error: cannot open video device (No such file or directory)
[00000376] v4l2 demux debug: trying device '/dev/video0' as audio
[00000376] v4l2 demux error: cannot open device /dev/video0 for OSS audio (No such file or directory)
[00000376] v4l2 demux debug: opening '/dev/video0' as video
[00000376] v4l2 demux error: cannot open video device (No such file or directory)
[00000376] v4l2 demux debug: opening '/dev/video0' as audio
[00000376] main demux warning: no access_demux module matching "v4l2" could be loaded
[00000376] main demux debug: TIMER module_Need() : 6.634 ms - Total 6.634 ms / 1 intvls (Avg 6.634 ms)
[00000364] main input debug: creating access 'v4l2' path='/dev/video0:norm=secam:frequency=543250:size=640x480:channel=0:adev=/dev/video0:audio=0'
[00000379] main access debug: looking for access module: 1 candidate
[00000379] v4l2 access warning: unknown option norm=secam
[00000379] v4l2 access warning: unknown option frequency=543250
[00000379] v4l2 access warning: unknown option size=640x480
[00000379] v4l2 access warning: unknown option channel=0
[00000379] v4l2 access warning: unknown option audio=0
[00000379] v4l2 access debug: main device='/dev/video0'
[00000379] v4l2 access debug: trying device '/dev/video0' as video
[00000379] v4l2 access error: cannot open video device (No such file or directory)
[00000379] v4l2 access debug: opening '/dev/video0' as video
[00000379] v4l2 access error: cannot open video device (No such file or directory)
[00000379] main access warning: no access module matching "v4l2" could be loaded
[00000379] main access debug: TIMER module_Need() : 5.131 ms - Total 5.131 ms / 1 intvls (Avg 5.131 ms)
[00000364] main input error: open of `v4l2:///dev/video0:norm=secam:frequency=543250:size=640x480:channel=0:adev=/dev/video0:audio=0' failed: could not create access


suggestions?

i did another experiment and collected some more data about this. there is still a very big difficulty running 2 web cams. to test it, i tried just simple command line commands to show the 2 cams locally at the same time. it seems somewhere my system is getting confused there are indeed 2 cameras.

first here is the setup. there are 2 webcams connected, both are logitech quickcam communicate mps:

glok@glok:~$ ls /dev/vid*
/dev/video0 /dev/video1

glok@glok:~$ lsusb
Bus 005 Device 008: ID 046d:09a1 Logitech, Inc.
Bus 005 Device 007: ID 046d:09a1 Logitech, Inc.
Bus 005 Device 001: ID 0000:0000
Bus 004 Device 002: ID 413c:02b0 Dell Computer Corp.
Bus 004 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000

then i run a command to view the first one, /dev/video0. this one comes up and displays fine:

glok@glok:~/practice$ vlc v4l2:// /dev/video0
VLC media player 0.9.8a Grishenko
[00000001] main libvlc debug: VLC media player - version 0.9.8a Grishenko - (c) 1996-2008 the VideoLAN team
[00000001] main libvlc debug: libvlc was configured with ./configure '--enable-v4l2'
[00000001] main libvlc debug: translation test: code is "C"
[00000345] main interface: creating httpd
[00000001] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.

while the above is still running, i try the next command to see the other cam at the same time. i get the errors shown. no video display comes up. can you please help?

glok@glok:~$ vlc -vvv 4vl2:// /dev/video1
VLC media player 0.9.8a Grishenko
[00000001] main libvlc debug: VLC media player - version 0.9.8a Grishenko - (c) 1996-2008 the VideoLAN team
[00000001] main libvlc debug: libvlc was configured with ./configure '--enable-v4l2'
[00000001] main libvlc debug: translation test: code is "C"
[00000001] main libvlc debug: checking builtin modules
[00000001] main libvlc debug: checking plugin modules
[00000001] main libvlc debug: loading plugins cache file /home/glok/.cache/vlc/plugins-04041e.dat
[00000001] main libvlc debug: recursively browsing `/usr/local/lib/vlc'
[00000001] main libvlc debug: module bank initialized, found 234 modules
[00000001] main libvlc debug: opening config file (/home/glok/.config/vlc/vlcrc)
[00000001] main libvlc debug: CPU has capabilities 486 586 MMX MMXEXT SSE SSE2 FPU
[00000001] main libvlc debug: looking for memcpy module: 3 candidates
[00000001] main libvlc debug: using memcpy module "memcpymmxext"
[00000317] main interaction debug: thread started
[00000317] main interaction debug: thread 3082623888 (Interaction control) created at priority 0 (interface/interaction.c:382)
[00000319] main input debug: Creating an input for 'Media Library'
[00000319] main input debug: Input is a meta file: disabling unneeded options
[00000319] main input debug: `file/xspf-open:///home/glok/.local/share/vlc/ml.xspf' gives access `file' demux `xspf-open' path `/home/glok/.local/share/vlc/ml.xspf'
[00000319] main input debug: creating access 'file' path='/home/glok/.local/share/vlc/ml.xspf'
[00000320] main access debug: looking for access module: 3 candidates
[00000320] access_file access debug: opening file `/home/glok/.local/share/vlc/ml.xspf'
[00000320] main access debug: using access module "access_file"
[00000320] main access debug: TIMER module_Need() : 1.820 ms - Total 1.820 ms / 1 intvls (Avg 1.820 ms)
[00000325] main stream debug: Using AStream*Stream
[00000325] main stream debug: pre-buffering...
[00000325] main stream debug: received first data for our buffer
[00000319] main input debug: creating demux: access='file' demux='xspf-open' path='/home/glok/.local/share/vlc/ml.xspf'
[00000326] main demux debug: looking for demux module: 1 candidate
[00000326] playlist demux debug: using XSPF playlist reader
[00000326] main demux debug: using demux module "playlist"
[00000326] main demux debug: TIMER module_Need() : 0.929 ms - Total 0.929 ms / 1 intvls (Avg 0.929 ms)
[00000319] main input debug: `file/xspf-open:///home/glok/.local/share/vlc/ml.xspf' successfully opened
[00000341] main xml debug: looking for xml module: 1 candidate
[00000341] main xml debug: using xml module "xtag"
[00000341] main xml debug: TIMER module_Need() : 0.528 ms - Total 0.528 ms / 1 intvls (Avg 0.528 ms)
[00000326] playlist demux debug: parsed 0 tracks successfully
[00000341] main xml debug: removing module "xtag"
[00000319] main input debug: EOF reached
[00000319] main input debug: control type=1
[00000326] main demux debug: removing module "playlist"
[00000320] main access debug: removing module "access_file"
[00000319] main input debug: TIMER input launching for 'Media Library' : 7.839 ms - Total 7.839 ms / 1 intvls (Avg 7.839 ms)
[00000343] main preparser debug: thread started
[00000343] main preparser debug: waiting for thread initialization
[00000343] main preparser debug: thread 3074186128 (preparser) created at priority 0 (playlist/thread.c:79)
[00000344] main fetcher debug: thread started
[00000344] main fetcher debug: waiting for thread initialization
[00000344] main fetcher debug: thread 3061500816 (fetcher) created at priority 0 (playlist/thread.c:108)
[00000318] main playlist debug: thread started
[00000318] main playlist debug: waiting for thread initialization
[00000318] main playlist debug: rebuilding array of current - root Playlist
[00000318] main playlist debug: rebuild done - 0 items, index -1
[00000318] main playlist debug: thread 3053108112 (playlist) created at priority 0 (playlist/thread.c:117)
[00000345] main interface debug: looking for interface module: 1 candidate
[00000345] http interface debug: base :8080
[00000345] main interface: creating httpd
[00000345] main interface debug: net: listening to port 8080
[00000345] main interface error: socket bind error (Permission denied)
[00000345] main interface error: socket bind error (Permission denied)
[00000345] main interface error: cannot create socket(s) for HTTP host
[00000348] main http server debug: waitpipe: object killed
[00000345] http interface error: cannot listen on :8080
[00000345] main interface warning: no interface module matching "http,none" could be loaded
[00000345] main interface debug: TIMER module_Need() : 2.584 ms - Total 2.584 ms / 1 intvls (Avg 2.584 ms)
[00000345] main interface error: no suitable interface module
[00000001] main libvlc error: interface "http,none" initialization failed
[00000349] main interface debug: looking for interface module: 1 candidate
[00000349] main interface debug: using interface module "hotkeys"
[00000349] main interface debug: TIMER module_Need() : 0.561 ms - Total 0.561 ms / 1 intvls (Avg 0.561 ms)
[00000349] main interface debug: thread started
[00000349] main interface debug: thread 3044715408 (interface) created at priority 0 (interface/interface.c:168)
[00000351] main interface debug: looking for interface module: 1 candidate
[00000351] main interface debug: using interface module "inhibit"
[00000351] main interface debug: TIMER module_Need() : 26.670 ms - Total 26.670 ms / 1 intvls (Avg 26.670 ms)
[00000351] main interface debug: thread started
[00000351] main interface debug: thread 3036322704 (interface) created at priority 0 (interface/interface.c:168)
[00000353] main interface debug: looking for interface module: 1 candidate
[00000353] main interface debug: using interface module "screensaver"
[00000353] main interface debug: TIMER module_Need() : 0.926 ms - Total 0.926 ms / 1 intvls (Avg 0.926 ms)
[00000353] main interface debug: thread started
[00000353] main interface debug: thread 3027930000 (interface) created at priority 0 (interface/interface.c:168)
[00000318] main playlist debug: adding item `video1' ( /dev/video1 )
[00000318] main playlist debug: rebuilding array of current - root Playlist
[00000318] main playlist debug: rebuild done - 1 items, index -1
[00000318] main playlist debug: adding item `4vl2://' ( 4vl2:// )
[00000355] main interface debug: looking for interface module: 19 candidates
[00000355] main interface debug: using interface module "signals"
[00000355] main interface debug: TIMER module_Need() : 1.090 ms - Total 1.090 ms / 1 intvls (Avg 1.090 ms)
[00000355] main interface debug: thread started
[00000355] main interface debug: thread 3011144592 (interface) created at priority 0 (interface/interface.c:168)
[00000001] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
[00000357] main interface debug: looking for interface module: 3 candidates
[00000357] main interface debug: using interface module "qt4"
[00000357] main interface debug: TIMER module_Need() : 96.766 ms - Total 96.766 ms / 1 intvls (Avg 96.766 ms)
[00000357] main interface debug: thread started
[00000357] main interface debug: thread 2990541712 (interface) created at priority 0 (interface/interface.c:168)
[00000318] main playlist debug: rebuilding array of current - root Playlist
[00000318] main playlist debug: rebuild done - 2 items, index -1
[00000318] main playlist debug: starting new item
[00000318] main playlist debug: processing request item null node Playlist skip 0
[00000318] main playlist debug: creating new input thread
[00000360] main input debug: Creating an input for '4vl2://'
[00000360] main input debug: thread started
[00000360] main input debug: waiting for thread initialization
[00000360] main input debug: `4vl2://' gives access `4vl2' demux `' path `'
[00000360] main input debug: creating demux: access='4vl2' demux='' path=''
[00000361] main demux debug: looking for access_demux module: 0 candidates
[00000361] main demux warning: no access_demux module matched "4vl2"
[00000361] main demux debug: TIMER module_Need() : 0.273 ms - Total 0.273 ms / 1 intvls (Avg 0.273 ms)
[00000360] main input debug: creating access '4vl2' path=''
[00000362] main access debug: looking for access module: 0 candidates
[00000362] main access error: no access module matched "4vl2"
[00000362] main access debug: TIMER module_Need() : 0.254 ms - Total 0.254 ms / 1 intvls (Avg 0.254 ms)
[00000360] main input error: open of `4vl2://' failed: could not create access: no access module matched "4vl2"
[00000360] main input debug: thread 2982149008 (input) created at priority 10 (input/input.c:370)
[00000318] main playlist debug: finished input
[00000318] main playlist debug: dying input
[00000318] main playlist debug: dying input
[00000360] main input debug: thread ended
[00000318] main playlist debug: dead input
[00000360] main input debug: thread 2982149008 joined (playlist/engine.c:244)
[00000360] main input debug: TIMER input launching for '4vl2://' : 132.515 ms - Total 132.515 ms / 1 intvls (Avg 132.515 ms)
[00000318] main playlist debug: starting new item
[00000318] main playlist debug: changing item without a request (current 0/2)
[00000318] main playlist debug: using item 1
[00000318] main playlist debug: creating new input thread
[00000363] main input debug: Creating an input for 'video1'
[00000363] main input debug: thread started
[00000363] main input debug: waiting for thread initialization
[00000363] main input debug: `/dev/video1' gives access `' demux `' path `/dev/video1'
[00000363] main input debug: creating demux: access='' demux='' path='/dev/video1'
[00000364] main demux debug: looking for access_demux module: 1 candidate
[00000364] main demux debug: TIMER module_Need() : 2.501 ms - Total 2.501 ms / 1 intvls (Avg 2.501 ms)
[00000363] main input debug: creating access '' path='/dev/video1'
[00000367] main access debug: looking for access module: 5 candidates
[00000367] vcd access error: could not read TOCHDR
[00000367] vcd access error: no movie tracks found
[00000367] access_file access debug: opening file `/dev/video1'
[00000367] main access debug: using access module "access_file"
[00000367] main access debug: TIMER module_Need() : 1.987 ms - Total 1.987 ms / 1 intvls (Avg 1.987 ms)
[00000369] main stream debug: Using AStream*Stream
[00000369] main stream debug: pre-buffering...
[00000367] access_file access error: read failed (No such device)
[00000369] main stream error: cannot pre fill buffer
[00000363] main input warning: cannot create a stream_t from access
[00000367] main access debug: removing module "access_file"
[00000367] main access debug: waitpipe: object killed
[00000363] main input debug: thread 2982149008 (input) created at priority 10 (input/input.c:370)
[00000318] main playlist debug: finished input
[00000318] main playlist debug: dying input
[00000318] main playlist debug: dying input
[00000363] main input debug: thread ended
[00000318] main playlist debug: dead input
[00000363] main input debug: thread 2982149008 joined (playlist/engine.c:244)
[00000363] main input debug: TIMER input launching for 'video1' : 135.993 ms - Total 135.993 ms / 1 intvls (Avg 135.993 ms)
[00000318] main playlist debug: starting new item
[00000318] main playlist debug: changing item without a request (current 1/2)
[00000318] main playlist debug: nothing to play
[00000357] qt4 interface debug: Error while initializing qt-specific localization

got this working with the following command and vlm config file. thanks to all who read/helped.

command:
vlc -I http --vlm-conf vlm1.conf

vlm configuration file:

new channel1 broadcast enabled
setup channel1 input v4l2:///dev/video0:norm=secam:frequency=543250:size=640x480:channel=0:adev=/dev/video0:audio=0
setup channel1 output #transcode{vcodec=mp4v,vb=800,scale=1,acodec=mp4a,ab=128,channels=2}:standard{access=http,mux=ogg,dst=192.168.1.5:1234}

new channel2 broadcast enabled
setup channel2 input v4l2:///dev/video1:norm=secam:frequency=543250:size=640x480:channel=0:adev=/dev/video1:audio=0
setup channel2 output #transcode{vcodec=mp4v,vb=800,scale=1,acodec=mp4a,ab=128,channels=2}:standard{access=http,mux=ogg,dst=192.168.1.5:1235}

control channel1 play
control channel2 play

What did you changed?

it boiled down to what xtophe said, that v4l2 needed to be followed by 3 slashes. i had originally used only 2. so when i went to v4l2:///dev/vid... it worked.

i had also made some typos along the way. the bottom line of what works though is posted in my previous post in case others find it useful.