Matrox Monarch LCS, User Manual, Page: 55 / 106

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Settings page
Include audio
You must select Include audio to stream/record the selected audio source (see
“Configuring video and audio settings” on page 29 ) along with the video. If you
want to change this setting, you must do so before starting a streaming/recording
session; otherwise, you will need to stop the session, make the change, and then
restart.
¦ Note Monarch LCS uses the AAC audio format for streaming and recording.
Advanced settings
The following settings are considered advanced settings and may not need to be
modified in most cases:
• GOP structure Enter the GOP structure (distance between I frames) to
which you want to encode your input source for streaming or recording.
Monarch LCS uses the IP pattern when encoding. For example, a GOP
structure of 10 creates a GOP of IPPPPPPPPPI.
Your CDN may use the term “keyframe interval” instead of GOP structure.
Although related to the GOP size value, the keyframe interval is expressed in
seconds and refers to the length of time between anchor frames. To set the
Monarch’s
GOP structure based on the keyframe interval required by your
CDN, use the following formula:
$
Monarch GOP Size = Encoding frame rate × Required keyframe interval.
For example, if your video input is 1920 × 1080 @ 30 fps, and your CDN
requires a keyframe every 2 seconds, set your Monarch
GOP structure to
60 ( 60 = 30 × 2 ).
• Profile Set the H.264 encoder profile for your stream or recording to either
Baseline , Main , or High . Typically, the High profile provides the best
image quality and is suitable in most instances. However, depending on the
decoder used when viewing the stream or the recorded file, such as with
mobiles devices, a
Main or Baseline profile may be required.
Streaming 8 Mb/s Streaming 8 Mb/s 16
Streaming 8 Mb/s Recording 10 Mb/s 18
Recording16 Mb/s None 16
Recording 10 Mb/s Streaming 8 Mb/s 18
Recording 10 Mb/s Recording 10 Mb/s 20
None Streaming 16 Mb/s 16
None Recording 16 Mb/s 16
Encoder 1 Encoder 2 Maximum
(Mb/s)