X2

288 MPEG-4 encoder settings
Field order
Note: This parameter is only available if the setting "Field" is selected for "Picture type".
In case of interlaced streams, the half-image sequence is set. Read more about this
explanation regarding "Interlace (view page 304)".
Pulldown
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 304), P-Frame, or B-Frame (view page 305)).
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.
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.
Bit rate (Bits/