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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 a AVSync operation is the virtual tape timecode (vTC) value.
•
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.
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