Visual Circuits Mantis Media Gateway, User Manual

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Troubleshooting
198
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.
Through digital editing, MPEG 2 files can be de multiplexed,
i.e. 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.
Mismatched A/V Track Lengths
Mismatched AV track lengths result in an overall degradation
of system performance. Often a bad file will cause uneven or
stuttering playback on other channels of the system as well.