Cobalt-digital COMPASS 9223 Dual-Channel 3G_HD_SD MPEG-4 Encoder Manuel d'utilisateur télécharger pdf (Page 34)

34 9223-OM (V2.0)

• 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; there is a very small negative

impact in video quality if Closed GOP is selected.

• 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: This setting will cause the encoder to go to Baseline Profile.

There will be a small loss of encoding quality. The GOP Structure control will

not be selectable in Baseline Profile.

• GOP Structure: Select between IBBP, IBP and IP. Selecting IBBP gives the best

video quality, but some low-end decoders require IP. If Profile is set to Baseline Profile,

this control will not be selectable and will be forced to IP.

Note that if the Output Resolution setting in the Basic Tab – Video Configuration is set to one

of the low resolutions (480×270, 320×240, or 320×180), the Profile and GOP Structure

controls will not be selectable; this section will appear as follows:

Also note that if the Input Resolution setting in the Basic Tab – Video Configuration is set to

1920x1080p, the Profile and GOP Structure controls will not be selectable; this section will

appear as follows:

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Cobalt-digital COMPASS 9223 Dual-Channel 3G_HD_SD MPEG-4 Encoder Manuel d'utilisateur Page 34