Alcorn Mcbride A/V Binloop Uncompressed, Руководство пользователя, Страница: 73 / 123

Alcorn McBride A/V Binloop Uncompressed User’s Manual Page 63
A Word About Trigger Latency:
The Binloop uses two different types of Play commands. The first one,
called “Unsynchronized Play” is used mostly for “point-source” or other
audio/video applications where synchronization between channels is not
important.
The other type of Play command is called “Synchronous Play”. This
command needs to be used in those situations where absolute frame
synchronization is required across channels. This is the type of play
command issued by the
Play action. There are important differences
between how the Binloop reacts to these two commands.
Unsynchronized Play Latency
When this type of play command is sent to a reproducer, it starts playing
the file as soon as it possibly can. The latency is determined only by the
amount of time it takes the reproducer to process the play command,
load the clip from the SSD, and begin decoding and playing the file. This
latency is very short, but it is not predictable. For that reason, this
command is not recommended for use when the goal is to synchronize
playback between multiple reproducer cards. The unsynchronized play
command is normally used for applications that require multiple channels
of video that are unrelated to one another (like individual kiosks, etc.).
Synchronized Play Latency
The exact amount of latency
time will depend on the
SMPTE frame rate being used.
When using Play commands
from the Timecode trigger list,
it is highly recommended that
the SMPTE clock is locked to
V-Sync. This ensures that the
timecode framerate and the
video framerate of the
reproducers is synchronous.
A Synchronized Play is the same as an Unsynchronized Play with one
key difference. Rather than playing the video as quickly as possible,
the reproducer will wait a consistent amount of time after the play
command was received before playback starts. This ensures that
every reproducer that received this command starts playing at the
same time.
The latency between when the play command occurs and when the
file actually starts playing is exactly
2 seconds for a Synchronized
Play . This delay provides the reproducer with more than adequate
time to process the command and load the video from the SSD so
that it’s ready to start playing when the consistent wait period is over.
Use the Synchronized Play command for playing groups of Reproducers,
which must start playback in perfect synchronization (i.e. multi-channel
music tracks, video wall presentations, or 4K playback).