Telestream lightspeed live capture, Руководство пользователя

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Creating Capture & Tape Action Workflows
Creating and Activating the Tape Action Workflow
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Lightspeed Live Capture User Guide
Pre-Roll Duration . Specifies the number of seconds that tape rolls before a scheduled
recording begins. You can also assign a variable defined elsewhere in the workflow.
Note: Setting Pre-Roll Duration to 0 (zero) may have a use in some cases, such as
capturing digital sources. A 0 (zero) setting could cause issues when capturing from
tape sources. The default Pre-Roll is 3, which often works fine for a tape source.
Post-Roll Duration . Specifies the number of seconds that tape rolls after a scheduled
recording ends. You can also assign a variable defined elsewhere in the workflow. Note
that the VTR stops only after all frames have been captured, so post-roll may continue
longer than the duration you specify.
Timecode Override Enable . When checked, activates and overrides the Input Source
timecode with the one entered in the Timecode Override control. When enabled,
Timecode Override overrides the Input Source timecode during a capture with the one
specified and puts this timecode at the beginning of the output file. All clips in the Tape
clip list will have their timecode overwritten by this timecode.
Timecode Override . Specifies the timecode value to use to put at the beginning of the
output file when Timecode Override Enable is active.
Discontinuity Threshold . Specifies the minimum number of skipped frames that
constitutes a discontinuity (timecode break) state. This threshold affects both Create
New File on Discontinuity and Abort on Discontinuity, when enabled. Note that
decremented and repeated frames always count as timecode discrepancies, and for
these discrepancies, the threshold setting is ignored.
See Timecode Break Recording and Timecode Discontinuity Definition in the Using the
Tape Capture Web Application chapter for discontinuity details.
Create New File on Discontinuity . When checked and timecode discontinuity is
detected, specifies that the current media file is closed and a new media recording file
is opened. During an active capture recording, if a discontinuity is encountered, the
current capture file will complete, and a new media file recording will immediately
start.
Time code discontinuities are defined as follows:
- Time code increments: If time code increments by a value equal to or greater than the
selected Discontinuity Threshold value.
- Time code repeats: The Discontinuity Threshold value is ignored in this case.
- Time code decrements: The Discontinuity Threshold value is ignored in this case.
Example 1: A time code incrementing from 00:00:30;10 to 00:00:30;15 would be
detected by a threshold of 4 or less.
Example 2: A time code repeating from 00:00:30;10 to 00:00:30;10 would be detected.
Example 3: A time code decrementing from 00:00:30;10 to 00:00:29;00 would be
detected.