VLC 6 ip cameras mosaic config via RTSP

mosaic.vlm

# Runs on windows by command -> vlc --vlm-conf path_to_file.vlm

# Background options
new   bg broadcast enabled
# bg just plain black background jpg image
setup bg input     "C:\Users\full_path_to\back.jpg"
setup bg option image-duration=-1
setup bg output #transcode{sfilter=mosaic{width=1920,height=960,cols=3,rows=2,position=1,order="1,2,3,4,5,6",keep-aspect-ratio=enabled,keep-picture=1,mosaic-align=5},vcodec=mp4v,vb=2000,fps=15}:duplicate{dst=display}

# Input options
new   1 broadcast enabled
# RTSP string for HIKVISION cameras
setup 1 input "rtsp://admin:pass@0.0.0.0:554/ISAPI/Streaming/Channels/102"
setup 1 option dshow-size="640x480"
setup 1 output #duplicate{dst=mosaic-bridge{id=1,width=640,height=480},select=video,dst=bridge-out{id=0}}

new   2 broadcast enabled
setup 2 input "rtsp://admin:pass@0.0.0.0:554/ISAPI/Streaming/Channels/102"
setup 2 option dshow-size="640x480"
setup 2 output #duplicate{dst=mosaic-bridge{id=2,width=640,height=480},select=video,dst=bridge-out{id=1}}

new   3 broadcast enabled
setup 3 input "rtsp://admin:pass@0.0.0.0:554/ISAPI/Streaming/Channels/102"
setup 3 option dshow-size="640x480"
setup 3 output #duplicate{dst=mosaic-bridge{id=3,width=640,height=480},select=video,dst=bridge-out{id=2}}

new   4 broadcast enabled
setup 4 input "rtsp://admin:pass@0.0.0.0:554/ISAPI/Streaming/Channels/102"
setup 4 option dshow-size="640x480"
setup 4 output #duplicate{dst=mosaic-bridge{id=4,width=640,height=480},select=video,dst=bridge-out{id=3}}

new   5 broadcast enabled
setup 5 input "rtsp://admin:pass@0.0.0.0:554/ISAPI/Streaming/Channels/102"
setup 5 option dshow-size="640x480"
setup 5 output #duplicate{dst=mosaic-bridge{id=5,width=640,height=480},select=video,dst=bridge-out{id=4}}

new   6 broadcast enabled
setup 6 input "rtsp://admin:pass@0.0.0.0:554/ISAPI/Streaming/Channels/102"
setup 6 option dshow-size="640x480"
setup 6 output #duplicate{dst=mosaic-bridge{id=6,width=640,height=480},select=video,dst=bridge-out{id=5}}

# Launch everything
control bg play
control 1 play
control 2 play
control 3 play
control 4 play
control 5 play
control 6 play

@F-AlFaris that doesn't really surprise me. I had similar results when I was using the main stream of my cameras (with similar configurations). I ended up switching it to the substream feed, which looks fine when it's small anyway. In my case with Hikvision cameras, this was done by appending the "/Channels/101" to the path -- each vendor will be different.

I also noticed that VLC has a memory leak when using mosaic. If I used the main feed, I'd be lucky to have it working for more than an hour. With the substream, it works for ~24 hours. I ended up writing a small script to run every 5 minutes to check to see if "vlc.exe" is consuming more than 2GB of RAM -- if it is, forcefully close it, and relaunch.