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• 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.
Pass
Here you can choose whether you want to manually perform one-pass or multi-pass
encodings (2-pass, multi-pass)
Note: The 2-pass option in the main dialog of the MPEG-4 export is recommended.
This automatically performs two encoder passes.
If you want to perform 2-pass encoding manually, you must select "Multi-pass
analysis" in the first pass and "Multi-pass encode" in the second pass.
• Single pass: The encoder process takes place without prior analysis. This requires
the least amount of time.
• Multi-pass analysis: Analysis data is calculated during encoding and used for
multi-pass encoding.
• Multi-pass encode: Assumes that an analysis has already been performed The
analysis data is used during encoding to optimize the results.
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. "Use HRD" must also
be activated.
Aspect ratio
In the film industry, this is an indication 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-