Chapter 7
Using Pipeline Control
120
March, 2009
Playout Preferences
Figure 7–23. Playout Preferences
Filler. Select Black, Test Pattern, or other QuickTime file to play out during spaces in the schedule.
Queue Size. Set the queue size (in number of frames). The minimum is 8 frames and the maximum is 22
frames. The default is 22 frames, in order to provide the most reliability.
During playout, the Pipeline keeps a queue of frames in memory to compensate for network latencies. If
queue size is set for a large number of frames, the Pipeline can ‘ride out’ higher transient latencies in the
network. However, a large number also introduces a longer delay between the time the frame is emitted on
the network and the time that the frame appears on the SDI connection (roughly 1/4 second for 8 frames,
up to about 3/4 second for 22 frames).
If you are concerned with latency between the time video is exported from the computer and the time it is
sent out the Pipeline, you should adjust the value lower. However, lowering this value makes the
connection more susceptible to errors due to insufficient CPU power or network bandwidth.
When the schedule document is in active Playout mode, video playout is based on the events in the
schedule. When no event is scheduled for a particular time then media is played out as determined by the
Playout Preference panel selections.
If you want to play out custom video during times with an empty schedule, the video must meet the
following requirements:
The user-supplied QuickTime movie must have video and audio formatting that matches the settings in the
schedule document. For example, if the schedule document is set to IMX30 PAL with 4 channels of audio,
then the selected QuickTime must also be IMX30 PAL with 4 channels of audio.
To provide a single filler file that you can use with any schedule regardless of the settings, you can create
a QuickTime movie with one video track per supported codec, and eight channels of audio.
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