No video streaming

[googie]

Hi,

I have 2 cameras on video4linux v2 capable card and it used to work. I don't know why but it stopped to work lately.

It simply doesn't show video picture when I pick any of camera monitors.

I looked at logs and there is nothing to be worry about. I checked all /tmp/zm*.log, including most recent zm_debug.log.*, /var/log/syslog and /var/log/messages - nothing frightening.

I also checked permissions for /dev/video0 - they're ok.

What else can I check?