User manual

MPEG-4 encoder settings 149
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• The bit rate can be set between 6 and 512 kbit/s. 160 kbits/s is
active by default. The higher the value is, the larger the resulting file
and higher the audio quality. After a certain limit, additional
improvements to audio quality will not be perceived. Bit rates under
64 kb/s are not recommended.
• As an MPEG version, set MPEG-4 or the older, proven MPEG-2
format.
• For the File Header Type, choose either RAW or ADTS. The
"Header" indicates an explanatory head for the beginning of the file
segment, which in fact takes up extra space, but is required for
decoding under circumstances.
- RAW indicates material which does not include a file header
in audio format. The audio material is therefore transferred
directly without any special additional information (raw).
This requires that decoding routines are able to process the
material without the explanatory file header. Especially in case
"exotic" sample rates are set, this can lead to problems
during RAW encoding.
- ADTS indicates a file header type which contains information
for encoded audio material. In case of doubt, select this file
header type, since fewer problems can be expected in this
case.
Object type: This provides selection between "Main" and "Low
complexity".
• Low complexity: Data is present in a form that hinders different
decoding algorithms (noise replacement), but enables others
(temporal adjustment noise formation).
• Main: This sets other focuses in the encoding, and other decoder
algorithms can be used.
Note: For example, Apple iPod requires "low complexity encoding".
However, you don't need to worry if you select the right preset for
Apple iPod in the export dialog.
Multiplexer
The multiplexer is a component of the encoder which combines audio
and video streams.
Output format
MPEG-4 file: This is an MPEG standard (ISO/IEC-14496) with the