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I have NVR and CCTVs.

I need NVR =====(RTSP)=====> WEB
but... web browser not support rtsp.

so always running 1 mini computer (like. SERVER) install vlc. and restream rtsp => hls(ogg)
like : vlc "rtsp://id:pass@adress:554/cam/realmonitor?channel=1&subtype=1" :sout=#transcode{vcodec=theo,vb=1024,scale=Auto,acodec=none,scodec=none}:http{mux=ogg,dst=:8080/A} :sout-all :sout-keep

So ~
NVR =====(RTSP)=====>[SERVER]=====(OGG)=====>WEB Success.
but, many CCTV(more then 2).

So...
vlc "rtsp://id:pass@adress:554/cam/realmonitor?channel=1&subtype=1" :sout=#transcode{vcodec=theo,vb=1024,scale=Auto,acodec=none,scodec=none}:http{mux=ogg,dst=:8080/A} :sout-all :sout-keep
vlc "rtsp://id:pass@adress:554/cam/realmonitor?channel=2&subtype=1" :sout=#transcode{vcodec=theo,vb=1024,scale=Auto,acodec=none,scodec=none}:http{mux=ogg,dst=:8080/B} :sout-all :sout-keep

BUT........
It will not work on the second or above.
Only the first one works normally.

How can I fix it? About this issue.

You need 2 ports, I believe.