ViewCast 4100 manual IMPORTANT! Raising gpmin higher than its default of 16 is

Appendix B: H.264 Advanced Settings

Setting	Explanation
	recommended that you use the default setting of 51 and not
	31.
QuantizerMaxDiffBetweenFrames	This value determines the maximum change quantizer
	between two frames. The purpose is to reduce the possibility
	of any large quality jumps in the output video. It is better to
	slow this change over a few frames rather than all at once. 4 is
	good, however if you don’t want to see big jumps in bit rates
	and don’t mind big jumps in quality, you can increase the
	value to 8 or 16.
QuantizerMin	This value sets the minimum quantizer you will ever use. The
	lower the quantizer the closer it is to its input. For most video,
	anything below 10 is perceptually lossless. Anything below the
	default of 8 is definitely lossless.
	IMPORTANT! Raising gpmin higher than its default of 16 is
	strongly discouraged because this could reduce the quality
	of flat background areas of the frame.
QuantizerScaleCompress	The default setting is 0.60. Use this value to trade off the
	number of bits allocated to “expensive” high-motion versus
	“cheap” low-motion frames.
	At one extreme, a setting of 0.0 aims for true constant bit
	rates. Typically with high-motion scenes, this setting tends to
	look bad. If you use low bit rates, however, low motion scenes
	appear perfect but use more bits than needed.
	The other extreme setting of 1.0 aims to achieve constant
	quantization, however this setting throws many bits at high-
	motion scenes, and a lot less at low-motion scenes which can
	cause the bit rate to fluctuate. 0.50 performs well on sports,
	0.60 on action content, while 0.30 works well with news
	broadcasts. 0.2 works well with drama-type movies, soap
	operas, and shows.
ReferenceFrames	This value is the number of previous frames each P-frame can
	use as a reference. Recommended value is around 4 to 8. Each
	increase has reduced benefit and constant speed loss with
	higher CPU usage. However, 16 can be helpful for animated
	content, video game capture, CGI, and other similar content.
SceneChangeDetectThreshold	0 turns off scene change detection. Higher values of scenecut
	increase the number of scenecuts detected. A good default is
	40.
	IMPORTANT! Lowering the default causes less scene
	detections so it would use less IDR frames. Those are
	expensive heavyweight frames.

126 ViewCast