Why Should the A/V Drives be Short-Stroked?


Product: Flyer

Platforms: 2000 3000 3000T 4000 4000T

Problem: The drive was not short-stroked to the HQ5 capacity, and the drive is being used for HQ5 recording and playback. Problems are being encountered.

Solution: Test and reformat the drives, using the short-stroke option to format only the HQ5-capable portion of the drive.

In order to perform A/B roll edits when clips which are adjacent in a sequence reside on the same video drive, A/V temp headers from one of the video clips must be copied to the opposite drive.

These files are always copied to the innermost available tracks of the target drive, so as not to interfere with recording new material to the drives. The innermost tracks are the slowest tracks, and if these inner tracks transfer data below the required speed for HQ5 playback, then the sequence will fail, exhibiting stuttering or dropouts.

This can be worked around to some extent by alternating the clips which are used in a sequence between the two video drives. No header is needed if each successive clip is on the opposite drive to the clip which preceeded it.

Users with limited drive space sometimes fail to account for the space needed for temp files. If the drives are too full, then there will not be sufficient room for the temp files required for the seqeucne to play properly. Sometimes this will cause a failure wherein the Flyer software reports that "No video drives were found", but in fact the drives are too full. The user may need to alternate clips so that temp files are not needed to play the sequence, or may need to invest in additional video drives or larger video drives.



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