Page 343 - Manual_Movie Edit Pro 2021_EN_Neat

MPEG-4 encoder settings 343
• Constant quantizer: In this mode, a fixed colour quantization is used for the
macro blocks. Under Advanced settings, a value between 1 and 32 can be set
independent of the respective frame (I-Frame (view page 348), P-Frame, or
B-Frame (view page 350)). The higher the value, the stronger the quantization:
small values produce qualitatively high-quality images and the data rate
increases, and larger values produce a reduction in data, but the quality suffers.

Bit rate (Bits/s)
• In "Constant bit rate" mode: Exactly those values entered are applied to be able
to calculate the size of the video precisely.
• In "Variable bit rate" mode: The values entered here are applied to the video as
an average as a guideline. The size of the video to be exported can only be
approximated.

Max. rate
This is the maximum bit rate that should be present in the video stream, i.e. maximum
number of bits that may be transferred to the decoder.

Note: This option is only available in "Variable bit rate" mode.

Pixel aspect ratio

Specifies the page ratio of the individual image points (pixels).

Meaning: Different television norms and the standard pixel ratio. Select a setting and
the results are displayed as "X" and "Y".

X/Y: The actual pixel ratio. If under "Meaning" the setting "Custom" is selected, then
a custom ratio can be set.

GOP structure

Max key interval
Determines the maximum GOP (view page 348) length. High values mean improved
compression. Lower values create stronger security protection and enable improved
access to individual frames for processing the video.

B-frames count
The number of B-Frames (view page 350). Several applications, e.g. video
conferences, require a setting of "0" for this, i.e. no B-Frames, in order to enable the
shortest possible reaction times for transfer.