X4

376 MPEG-4 encoder settings
http://pro.magix.com
 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.
VBV buf. size
VBV is the abbreviation for "Video rate buffer verifier definition" and the size of
the buffer (storage area) that is applied to the encoding.
The larger the buffer is, the better the results will be, but the processing will
also take much longer. The smaller the buffer is, the more parallel processing
can take place at the same time in RAM.
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 394) length. High values mean
improved compression. L
ower 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 396). 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.