External Control Commands
145
mpgBlack
The
mpgBlack
command covers MPEG video on a channel,
causing the corresponding video display to go black.
To uncover the video, use the
mpgUnblack
command.
Syntax
mpgBlack 0 channel
Parameters
channel
The channel on the media player (0-3)
Return Values
This command returns
ACK
if
mpgBlack
was started successfully, or
NAK
if
mpgBlack
could not be started.
Remarks
❏
Video playback is independent of whether the video is
muted with
mpgBlack
or not. The videos continue to play
underneath the black, audio is unaltered, and callbacks
continue being sent normally.
❏
If a playlist is played with one of the commands, such as
playlistPlay
, unused channels (channels with no video files)
are set to the blackened state. Therefore, it is necessary to
call
mpgUnblack
on those channels if they are to play video
using commands such as
mpgLoad
/
mgpPlay
.
See
mpgUnblack
on page 146 for more information on
“unblacking” video.
This black may not be recognized by all displays as a true
video signal.
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