ViewCast 2120 manual Explanation of Settings, Setting Explanation

Niagara 2120 User Guide

Settings

Table 40 provides an explanation of each setting and its function.

	Table 40. Explanation of Settings
Setting	Explanation
BitRateTolerance	Setting the bit rate tolerance tells the encoder it must hit the
	target bit rate almost exactly. However, this value can have an
	adverse effect on quality because you are forcing the encoder
	to stay at a target bit rate. More heavy frames may not get
	enough bits to make the image look better while less heavy
	frames get more than they need. As a result, the quality may
	vary. If you set the value to 1, the encoder uses 0.01.
DirectMVPrediction	The default setting is temporal. Temporal breaks when b-
	pyramid is applied. As a result, it is easy to mix the two
	improperly. Spatial is a better default.
GOPSize	This value sets the maximum interval between IDR frames.
	Theoretically, higher values improve compression because IDR
	frames are the heaviest, but it can also reduce the appearance
	of fluctuating quality.
GOPSizeMin	This value sets the minimum length between IDR frames. This
	setting limits the minimum length after each IDR frame before
	another can be placed.
InLoopDeblockingFilterAlpha	This value affects the overall amount of deblocking applied to
	the picture. Higher values deblock more efficiently, but retain
	less detail causing the image to appear softened.
	The default value is 0 and should be sufficient to eliminate
	most blocking, but it leaves the picture noticeably blurrier. In
	general, values should be no lower than -3and no higher than
	3. This value is the most important parameter in determining
	the overall sharpness of your encode.
InLoopDeblockingFilterBeta	This value determines whether something in a block is or is not
	a detail when deblocking is applied. Lower values apply less
	deblocking to more flat blocks with detail present and more
	deblocking to blocks without detail. Higher values cause more
	deblocking to be applied to less flat blocks with details
	present. Raising the value of Beta deblocking is a good way to
	get rid of ringing artifacts by applying more aggressive filtering
	to blocks that aren’t very flat. Lowering the value of Beta
	deblocking is a good way to reduce the amount of DCT blocks
	without blurring the entire picture.
MotionEstimationMethod	This value sets the quality. It determines the motion detection
	method (5 is dia, 7 is hex, 8 is umh, 2 is esa, 10 is teas).

ViewCast 83