Virtual Tapes – Sync’ing Audio and Video (QShell)
The
VTPMerge
utility may also be used to synchronize audio to video. Audio timing may be adjusted
within a single virtual tape file or may be done while merging two virtual tapes. In either case, the result
is a new virtual tape file. If the timing is not quite right, the operation may be performed as many times
as needed without creating multiple copies of the project asset files.
Adjust Audio Timing (Single VTP)
To adjust the timing of all audio events in a VTP (but leave video events intact), specify just one source
vtp.
VTPMerge <source VTP> <destination VTP> <Avsync vTC aTC>
Example:
Volume:project>
vtpmerge source.vtp new.vtp AVSync 01:00:05:00 01:00:08:12.00
In this example, the audio events beginning at 1 hour, 8 seconds and 12 frames are moved to a
new position on the virtual tape – 1hour, 5 seconds.
Adjust Audio Timing (Multiple VTPs)
To adjust the timing or placement of merged audio assets on the virtual tape timeline, specify both
source virtual tape files and use the
AVSync
parameter to identify the appropriate audio adjustment.
The first virtual tape file should be the video source VTP and the second source virtual tape file should
be the audio source for the merge operation.
VTPMerge <source VTP> <source2 VTP> <destination VTP> <AVSynce vTC aTC>
Example:
Volume:project>
vtpmerge video.vtp audio.vtp av_new.vtp AVSync 01:00:05:00 01:00:08:12.00
In this example, the incoming audio edits (from audio.vtp) will be placed on the virtual tape at 1
hour, 5 seconds instead of their original position (within the audio.vtp file) of 1 hour, 8 seconds
and 12 frames.
VTPMerge Notes
The TC specified for an AVSync operation is the virtual tape timecode (vTC) value.
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The .xx notation for fractional frame time is only valid for audio timecode (this is sub-frame access)
and may be omitted if no fractional time is required (.00 is assumed).
If the destination virtual tape exists, the operation will fail unless the
–replace
option is specified.
It is permissible (although not recommended) to specify one of the source VTP files as the
destination VTP.
QuVIS Encore
Page 140
QSR Version 3.1
