Bedienungsanleitung Niagara 9100 Series V7.0 (Seite 222 von 250) (Englisch)

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Appendix B: H.264 Advanced Settings

214 ViewCast

Baseline profile is for video conferencing and mobile applications and has the lowest demands on CPU

load and memory usage, but the lowest resulting quality. Main profile is for standard-definition TV,

while high profile is best for HD video.

Note: You can use each profile for any resolution video with expected increases in video encode

quality and corresponding impacts to CPU and memory. Finally, you may use additional

changes to the Advanced Encoder Settings to further refine the video encoding.

Settings

Setting

Explanation

BFramesMax

This value sets the maximum number of concurrent B-frames

you can use. More B-frames improve video quality but also

increase CPU load, in some cases considerably. Only Main or

High Profile support B-frames. Changing this value when

Baseline Profile is selected has no effect.

GOPSize

This value sets the maximum interval between IDR (also

called reference) frames. Theoretically, higher values improve

compression because I-frames have more data but it can also

increase the appearance of fluctuating quality because more

P- or B-frames (partial) are used. If you see “pulsing” or

“strobing” in the encoded video, this value may be too low.

GOPSizeMin

This value sets the minimum length between IDR (reference)

frames. This setting limits the minimum length after each I-

frame before another can be placed. The suggested default is

1 x the frame rate.

InLoopDeblockingFilterAlpha

This value affects the overall amount of deblocking applied to

the video. Higher values remove blocky appearance more

efficiently, but retain less detail causing the image to appear

softened. This value is the most important parameter in

determining the overall sharpness of your encode. To make a

low bit rate encode look smoother, set this to a positive

number. The default value is 0 and should be sufficient to

eliminate most blocking. In general, values lower than -3 and

higher than 3 are usually not used, but could be if so desired.

InLoopDeblockingFilterBeta

This value determines whether something in a block is a detail

or not when deblocking is applied to it. 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 are not very flat. Lowering the value of

Beta deblocking is a good way to reduce the amount of DCT

blocks without blurring the entire picture. Again, the default

value of 0 usually is good enough. Set this to a positive

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