FOCUS Enhancements 3.2 - Manual (Page 177)

Troubleshooting
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3. The bit rate of the MPEG files being played exceed the system
capabilities: The Visual Circuit MPEG decoder boards and
digital servers all have a maximum sustained bit rate that can
be delivered. Refer to the system capabilities above for basic
information. Consult your Visual Circuits representative prior
to encoding or designing your installation if there are any
questions.
4. Uneven audio to video track lengths: Confirm the length of the
audio track to the length of the video track. The Visual Circuits
driver aggressively synchronizes the audio and video data of
the MPEG file to maintain Audio/Video (AV) Sync. If the
MPEG file's audio and video tracks are uneven in length, the
driver's attempt to synchronize these uneven tracks will result
in poor performance. Mismatched AV track lengths will result
in overall degradation of system performance. Often a "bad"
file will cause uneven or stuttering playback on other channels
of the system as well. Through digital editing, MPEG 2 files
can be "demultiplexed" (separating the audio from video
information). The audio and video tracks can then be edited to
match. The two tracks can then be "multiplexed" back together.
Always test files individually if a file (or system) is suspected
to have playback problems.
Some files in the playlist do not play
1. All files on a playlist channel must be the same type.
If some are elementary stream (video only) and others are
program stream (audio & video), some files will be
automatically skipped in order to keep playback running
smoothly.
2. Filenames and External Commands
When using external commands to handle files, it is necessary
for those files to have names without, i.e. sales_video.mpg not
sales video.mpg. One convention is to use underscores in place
of spaces.