NTP synchronized

Encoders keeps the system synchronized with a NTP server.

The NTP daemon must be configured for dynamic polling interval as per RFC 5905 to maintain a maximum clock drift up to 1 PPM (0.0864 seconds or 86.4 ms or 3 frames in a 30 fps video).

The NTP daemon must be configured to an NTP server chain in public stratum with a node value of 4 or lower.