User manual

146 MPEG-4 encoder settings
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time as the analysis for the second encoding is calculated.
• Multi-pass encode: The first encoding is carried out at the same
time as the analysis for the second encoding is calculated and
updated. This produces the best results, but the process requires
the most time.
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.
HSS 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.
CPB size
This sets the size of the "coded picture buffer“ in bits. This is the
buffer where the encoding is carried out. The larger the buffer is, the
better the results will be, but the processing will also take much
longer.
Aspect ratio
In the film industry, this is an indictation of the ratio between width
and height of a rectangle, monitor, or screen.
There are 3 different sizes available:
• Picture Aspect Ratio (also Display Aspect Ratio, DAR): This
indicates the desired aspect ratio of the video to be exported. Here
are some examples of typical aspect ratios: at home 4:3, 16:9
(typical for TV sets) or 16:10 (widescreen-flatscreens, widescreen
notebooks), 3:2 for 35mm films and photos. In cinemas you mostly
find 1.85:1.
• Pixel Aspect Ratio (PAR, pixel aspect ratio: Indicates the aspect
ratio of individual pixels. The majority of computer monitors have
quadratic pixels (PAR=1:1), for analog television monitors (PAL at
4:3) 128:117.