Fast check for black screen/no stream from ipcam

[deemytch]

Hi all

I use vlc now to stream (and re-encode) the video from couple of ipcams. And I`m in doubt now how can I check if some ipcam is showing a black screen (no light in the room), or is restarting/broken etc. It`s like icmp pings are passed, but no stream. For the last one - I don`t understand how to setup very short timeouts, for the black screens - I`m completely in a fog.

Is there any not-so-complex solution?
Please, help.

[deemytch]

Found --tcp-timeout, --rtp-timeout, --rtsp-timeout, looks like tcp-timeout are only useable.