VLC mosaic

This is a small How to about using VLC to create mosaic.What I want is to mix 2 udp multicast stream on a background image and stream the result video on the network.

Step 1
Get the latest vlc and install it

Step 2
Use the VLC to display the local image,many image formats are supported.

    vlc fake:// --fake-file Picture/background.jpg --fake-aspect-ratio "4:3"

Step 3
Now stream 2 udp multicast with VLC

Step 4
Construct the vlm configuration file(named vlm.conf for example) like this

    new channel1 broadcast enabled                                                       
    setup channel1 input udp://@224.0.0.1:1234                                        
    setup channel1 output #duplicate{dst=mosaic-bridge{id=1,height=144,width=180},select=video,dst=bridge-out{id=1},select=audio}                                                         
                                                                                
    new channel2 broadcast enabled
    setup channel2 input udp://@224.0.0.1:1234
    setup channel2 output #duplicate{dst=mosaic-bridge{id=2,height=144,width=180},select=video,dst=bridge-out{id=2},select=audio}                                                         

    new background broadcast enabled
    setup background input fake:
    setup background output #transcode{sfilter=mosaic,vcodec=mp2v,vb=10000,scale=1}:bridge-in{delay=400,id-offset=100}:standard{access=udp,mux=ts,url=239.255.1.1,sap,name="mosaic"}

    control background play
    control channel1 play
    control channel2 play

Step 5
Launch VLC

    vlc --color -I telnet --vlm-conf vlm.conf --ttl 12 --fake-file background.png --fake-aspect-ratio "4:3" 
 --mosaic-width 360 --mosaic-height 288 --udp-caching 800 --mosaic-keep-picture --mosaic-rows 2 --mosaic-cols 2 
 --mosaic-position 1 --mosaic-order 1,2,3

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