У вашего броузера проблема в совместимости с HTML5
This is the demonstration of Synology SurveillanceStation Time-Bomb.
If you modify the files in order to increase the free license (default is 2 cams), there's CRC check protection. If you can't defeat CRC check protection, all cameras will be disabled (not performing recording). If you think you can defeat it, try to restart SS whether all cams still perform recording or not.
If total cam is less than or equal 2, time-bomb will never happen. But if total cam is larger than 2 cams, time-bomb protection will show. Ensure you defeat it.
Coz time-bomb protection will not perform immediately. But it will perform, usually in less than 24 hours. Sometimes more than 24 hours. But never happened after 168 hours (7 days).
So... if SS running fine AFTER 7 DAYS without being interrupted by electricity blackout, you are safe to go.