VBrick Systems VB4000, VB6000, VB5000 manual Video Rate1 Video Rate2 Video Rate3

Video Rate1	Video Rate2	Video Rate3
320x240	320x240	320x240
320x480	†	†
400x300	320x240	320x240
512x384	256x192	256x192
640x240	640x240	640x240
640x480	320x240	320x240

† Cannot be encoded.

Table 10. Supported 16:9 Video Encoding Resolutions (in pixels)

Video Rate1	Video Rate2	Video Rate3
640x360	320x180 †	320x180
640x180	640x180	640x180
384x216	384x216	384x216
256x144	256x144	256x144
128x72	128x72	128x72

†320x180 is only allowed for Video Rate2 and Video Rate3 and only when Video Rate1 is 640x360.

Resolution	Sets the video encoding resolution. The values differ depending on the
	Video Aspect Ratio. When Video Aspect Ratio = 4:3, the values
	available for Resolution are shown in Table 9. The Resolution for
	Video Rate2 and Rate3 are automatically set equal to Video Rate1
	except when the height (the number of lines of resolution) is 480. (If
	the height equals 480, the corresponding values for Video Rate2 and
	Video Rate3 are set to 1/4 of the Video Rate1 resolution). When
	Video Aspect Ratio = 16x9, the values available for Resolution are
	shown in Table 10.
Rate Control	The selections are CBR-CFR or CBR-VFR. Default = CBR-CFR. The
Method	abbreviations refer to:
	• CBR – Constant Bit Rate specifies a fixed bit rate so that data is
	sent in a steady stream.
	• CFR – Constant Frame Rate specifies a fixed frame rate for the
	stream.
	• VFR – Variable Frame Rate means the encoder may drop frames in
	order to maintain better quality.

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