Telestream Lightspeed Live Capture User Manual page 255

Note: Live Capture's Time-Shift holds incoming source media frames in an internal
FIFO buffer. See
various frame sizes and rates.
When a capture workflow is activated with Time-Shift enabled, the source media is
stored in the buffer, which allows Lightspeed Live to reach back in time and access
media processed in the past, based on the value of the Time-Shift field. Since Live
Capture's Time-Shift is always processing a source's media, when you start recording,
any media stored in the buffer is available to be added to the capture file.
Preferred Processor
Note: If this control doesn't display, processor balancing on this model server is
performed automatically, and no end-user adjustment is available, or advanced mode
is disabled (see
sources—disable it when capturing UHD/4K.
When enabled (C2+ and earlier), processing associated with each Capture | Tape job is
assigned to the assigned CPU on the server's multi-core CPU to prevent inefficient
process mapping across CPU sockets during heavy loads, typically when several
sources are capturing concurrently.
On C4 and later models, for IP sources you can manually set affinity to a specific socket.
If you create IP sources in order and use them in order, balancing is automatic. However,
for example, if you delete every other IP source, the remaining sources do not balance
and you can use can use this control to balance them. If IP sources are maintained long
term, it may be helpful to assign each source a preferred processor.
Disabling this option during multi-source capturing may result in excessive CPU usage.
When Preferred Processor is disabled, affinity is set to 0.
Timecode Source—Specifies the default timecode source. Choose from the following
timecode source signals:
– Source—For H.264 or H.265 the source's SEI data is used; for MPEG2 the source's
GOP header timecode is used. If no valid source timecode is available, see Free
Run Timecode below.
– Computer Clock— by the Lightspeed Live Capture Server. When selected, also
configure Compensate for Computer Clock Drift.
Caution: If your Lightspeed Live Server's Time Zone Setting is set to a time zone
that does not have Daylight Savings Time, computer clock use UTC time, due to a
Windows limitation.
– None—Specifies zero-based timecode recording. When recording begins, the
timecode is set to 00:00:00:00. If Free Run Timecode is enabled, then the
timecode inserted into a QuickTime or MXF file auto-increments. Otherwise,
every frame in the output file contains timecode 00:00:00:00. Capture displays N/
Lightspeed Live Capture User Guide
Determining the Time-Shift Buffer Duration
Managing System Settings). Use only when capturing SD/HD SDI
Managing Video Sources
Creating & Configuring RTMP Sources
for suggested settings for
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