X4

MPEG-4 encoder settings 375
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Note: This parameter is only available if the setting "Frame" or "MBAFF" (only
for AVC/H.264)" is selected for "Picture type".
In normal cases, an image playback rate of 24 (or 23.976) frames per second
is use; the NTSC system however requires 30 (or 29.97) frames/s, and there is
a special algorithm for converting the video's frame rate. For compilations or
test purposes, switch this option to "No". In normal cases, the setting can be
set to "Auto".
Slice count
A frame can be divided into multiple slices for encoding. Specify the maximum
number of slices are permitted. If set to "0", then the number will be
determined automatically.
Bit rate control
The bit rate indicates how much data per second is saved in the video
(playback speed). This makes the bit rate the deciding parameter for the video
to be encoded.
Mode
 Constant bit rate: The constant bit rate should only be used if the device used
to play the video supports constant bit rates.
 Variable bit rate: The bit rate varies. For faster movements in the video, the bit
rate increases, and for still images or slow pans, a lower bit rate is sufficient for
creating the video in constant quality.
 Constant quality: Similar to the "Variable bit rate" mode, the bit rate varies
according to the video material. The quality depends on the selected profile
and can be changed.
 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 395), P-Frame, or B-
F
rame (view page 396)). The higher the value, the stronger the quantization:
sm
all 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.