Advanced Tab - Video Parameters - Cobalt Digital Inc 9223 Product Manual

Dual-channel 3g/hd/sd mpeg-4 encoder
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• Mux Parameters: these are advanced controls related to audio/video multiplexing and
(P)SI tables.
Advanced Tab – Video Parameters
The Video Parameters section is shown below:
• GOP Mode: Select between Open GOP and Closed GOP The normal setting is Open
GOP. Closed GOP is used for some storage applications, and is also required by some
CDNs (such as YouTube); there is a very small negative impact in video quality if Closed
GOP is selected. For some output protocols (HLS and RTMP), this control becomes read-
only and is forced to Closed GOP..
• Level: Selects the H.264 level signaled in the bitstream. The default setting is Auto-
Select, whereby the encoder will signal the minimum required level based on the current
settings. If, for some reason, a different (higher) level is desired, it can be selected here.
Note that the encoder will not honor a level selection that is lower than the legal
minimum for the current settings. It is typically not necessary to change the level from
Auto-Select.
• Profile: This control has four options:
o Auto-Select: With this setting, the encoder will signal High Profile for HD and
Main Profile for SD.
o High Profile: With this setting, the encoder will always signal High Profile.
o Main Profile: With this setting, the encoder will always signal Main Profile.
o Baseline Profile: With this setting, the encoder will always use Baseline Profile.
The GOP Structure control will not be selectable in Baseline Profile and will be
set to IP.
Note that, as the profile is lowered, there will be video quality degradation. In other
words, for a given resolution and bit rate, the video quality for High Profile will be better
than Main Profile, and Main Profile will be better than Baseline Profile. Whether the
quality difference is noticeable will depend on the resolution, bit rate, and specific video
content.
• Aspect Ratio: The H.264 bitstream includes aspect ratio information in the VUI
Parameters part of the Sequence Parameter Set. Normally, the encoder will automatically
set the correct aspect ratio code. However, in some situations, it may be necessary to
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9223-OM (V2.5.0)

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