Telestream Lightspeed Live Capture User Manual page 260

Managing Video Sources
262
Creating & Configuring SRT Sources
AES Encryption—Enable to implement AES encryption on this source.
AES Encryption Passphrase—When AES encryption is enabled, supply a pass phrase
(10-79 characters).
AES Encryption Key Length—When AES encryption is enabled, specify the key length
from the menu.
Port Number—Specifies the port number to utilize for both listener and caller mode.
Max Time-Shift—Specifies the maximum duration of video that the time-shift frame
buffer can hold, which is used to delay the source for workflows using this source.
Specifies the duration in seconds (max. 10). Sources with higher bit rates and frame
rates may reduce duration.
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.
Force 8-Bit Video—Forces a 10-bit source to be down-sampled to 8-bit.
8-bit video should only be used with 8-bit codecs such as XDCAM. Using 8-bit sampling
offers more efficient compression.
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
Affinities).
Determining the Time-Shift Buffer Duration
Managing System Settings). Use only when capturing SD/HD SDI
for suggested settings for
(Balancing CPU Processor Group
Lightspeed Live Capture User Guide