User manual

140 MPEG-4 encoder settings
www.magix.com
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 131), P-Frame, or B-Frame (view page 132)). 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.