Cobalt Digital COMPASS 9223 Dual-Channel 3G_HD_SD MPEG-4 Encoder User Manual
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9223-OM (V2.0)
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Field/Frame Rate: Select to match your source. For all input resolutions, the supported
options always include 59.94 (for NTSC-based systems) and 50 (for PAL-based
systems). Some resolutions have support for additional frame rates, as follows:
o
If you select the 1920×1080i or 1280×720p resolutions, this field will also include
an option for a field rate of 60, used by same cameras:
o
If you select the 1920×1080p resolution, this field will also include an option for a
frame rate of 23.98 (Film):
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Output Resolution: Select the desired output resolution. The values in this drop-down
list are a function of the Input Resolution and the Frame/Field Rate. Also, please note
that some resolutions require additional licensing for the encoder. The following
resolutions are offered:
o
Same as the input (no scaling)
o
¾ scaling from the input
o
Low resolutions: 480Ч270, 320Ч240, and 320×180, progressive, at half and
quarter frame rates (not available for 1080p inputs)
o
HD inputs can be scaled (and re-interlaced if necessary) to SD resolution,
anamorphic (not available for 1080p inputs)
o
1080i, 720p and SD inputs can be converted to SD resolution, with progressive
frame rates (ideal for computer displays), as follows:
1080i59.94, 720p59.94, and 480i59.94 are converted to 720×480p29.97
1080i60 and 720p60 are converted to 720×480p30
1080i50 and 720p50 are converted to 720×576p25
The conversions from HD resolutions are done using anamorphic scaling.
o
1080i, 720p and SD
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inputs can be scaled to 640×360, with progressive frame
rates, as follows:
1080i59.94 and 480i59.94 are converted to 640×360p29.97
720p59.94 is converted to 640×360p59.94
1080i50 and 576i50 are converted to 640×360p25
720p50 is converted to 640×360p50
2
By default, SD signals have a 4:3 aspect ratio, unless they are derived from an HD source with anamorphic scaling.
The 640×360 resolution is intended for 16:9 content. Scaling SD to 640×360 should only be done if the SD signal is
anamorphic to start with, otherwise the resulting encoded signal will have an incorrect aspect ratio.