Vivotek IP7251 manual VGA Cmos

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				support), 1(support)
				Bit 4	=> Support
				zoom operation. 0(not
				support), 1(support)
				Bit 5 => Support focus
				operation. 0(not
				support), 1(support)
text	string[16]	<blank>	1/4	enclosed caption
imprinttimestamp	<boolean>	0	4/4	Overlay time stamp on
				video
maxexposure	1~120	5	4/4	Maximum exposure time
s<0~(m-1)>_codectype	mpeg4,	mpeg4	4/4	video codec type
	mjpeg
s<0~(m-1)>_resolution	VGA CMOS	CMOS	4/4	Video resolution in pixel
	=>	=>
	176x144,	640x480
	320x240,
	640x480
s<0~(m-1)>_mpeg4_intraperiod	250, 500,	1000	4/4	The period of intra frame
	1000, 2000,			in milliseconds
	3000, 4000
s<0~(m-1)>_mpeg4_ratecontrol	cbr, vbr	vbr	4/4	cbr, constant bitrate
mode				vbr, fix quality
s<0~(m-1)>_mpeg4_quant	1, 2, 3, 4, 5	3	4/4	quality of video when
				choosing vbr in
				“ratecontrolmode”. 1 is
				worst quality and 5 is
				the best quality.
s<0~(m-1)>_mpeg4_bitrate	20000,	512000	4/4	set bit rate in bps when
	30000,			choose cbr in
	40000,			“ratecontrolmode”
	50000,
	64000,
	128000,
	256000,
	512000,
	768000,

78 - User's Manual