Creating Capture & Tape Action Workflows
Creating and Activating the Tape Action Workflow
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Lightspeed Live Capture User Guide
Abort on Discontinuity
. When enabled, capture aborts when a timecode discontinuity
is detected as specified by the Discontinuity Threshold or when the VTR servo is not
locked.
Note:
Create New File on Discontinuity and Abort on Discontinuity options are
mutually exclusive; when both are checked, Abort on Discontinuity takes precedence.
That is, if discontinuity is detected, the job is aborted.
Ignore Frames When Servo is Not Locked
. If enabled, all frames captured while the
servo is in the unlocked state (as reported by the VTR) are excluded from the output file.
Create New File When Servo Relocks
. If enabled, creates a new media file when the
servo relocks after being in the unlocked state. When a servo relock is encountered
during an active capture recording, the current capture file will complete, and a new
media file recording starts.
If Create New File When Servo Relocks is enabled and Ignore Frames When Servo is Not
Locked is disabled, the system may create unwanted (unlocked) frames at the end of
output files.
If Create New File on Discontinuity is enabled and Ignore Frames When Servo is Not
Locked is also enabled, the result may be an output file that contains a discontinuous
timecode, even though Create New File on Discontinuity is enabled and the timecode
was always incrementing. This occurs because of the system ignoring frames,
regardless of the timecode, while the servo is unlocked. With this configuration, the
frames captured during the period when the servo was unlocked will be excluded from
the output file. New frames would then be added to the file when the servo relocks,
which would cause the output file to have discontinuous timecode. To avoid this
scenario, enable the Create New File When Servo Relocks option. In this state the relock
of the servo will start a new file where the discontinuity in the output file would have
been.
As described above, repeating timecodes are counted as discontinuities. Most VTRs
repeat timecodes when the servo is unlocked; therefore, if Ignore Frames When Servo is
Not Locked is disabled and Create New File on Discontinuity is enabled, the result may
be many single frame files while the servo is unlocked. This will not happen if Ignore
Frames When Servo is Not Locked is enabled.
With many VTRs, particularly an SRW-5800, there can be gray frames after the servo
relocks. Timecode for these frames is often invalid. Because the system is only able to
respond to the status the VTR provides, it will not detect and exclude these gray frames.
No two passes of the same section of tape are likely to be identical. This occurs because
the VTR can sometimes take longer than others to lock the servo after the control track
is detected. Therefore, it is important to check the logs to verify whether the servo was
locked while a specific frame was captured.
For past users of Telestream’s Pipeline tape capture product, enabling all three settings
above will provide the cleanest results and the closest to what Pipeline used to do.
