FOCUS Enhancements 3.2 - Manual (Page 141)

External Control Commands
127
mpgPlayAll
This command starts playback on all channels simultaneously. The
files for each channel to play must have been previously loaded
using the mpgLoad command.
Syntax
mpgPlayAll
Parameters
None
Return Values
This command returns ACK to indicate that playback was started
successfully, or NAK to indicate that playback could not be started
on all channels.
mpgSetInitOnOpen
This command controls the video loading behavior of all channels.
Syntax
mpgSetInitOnOpen on
Parameters
on
on=1, output goes black, playback memory is cleared.
on=0, seamless transition to new video, no output reset. Last played frame of
video remains until next video is played. May reduce display rolls or opening
flicker.