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How Time-Delayed Video Is Stored
How Time-Delayed Video Is Stored
When an incoming video broadcast is captured for time delay, it is stored in a “virtual” file in
the BMC inventory. This is a special, circular video file comprised of a series of fixed-length
segments. When the last segment of the file is filled up with captured video, the system
continues to store video by overwriting the first segment. Since time-delayed rebroadcast is a
continuous operation (24 hours per day, 7 days per week), the circular file format allows you to
keep capturing video indefinitely without filling up the BMC storage space.
Normally, the Time Delay utility stores enough video in the virtual file only to accomodate the
longest time delay required for the channel, before it starts overwriting the old material. If you
want extra video material to be stored in the virtual file as a safety measure, you can specify an
“extra delay” for the channel. You should do this if you think in the future you might need to
increase the channel’s time delay without interrupting service.
For example, if you know that the originating broadcast region will enter daylight savings time
at some future point but the time-delayed broadcast region will not, you should build in an extra
hour of delay to accomodate that change. Otherwise, when the change occurs, you’ll have to
stop, reconfigure, and restart the channel, causing the time-delayed broadcast region to go off
air for the full duration of the new (longer) time delay.
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SeaChange BMC Management Guide