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AAC is equally suitable for encoding general audio information and not especially
optimized for certain types of audio material.
AAC audio can be encoded with a sample rate of 8000, 16000, 24000, 32000 or
48000 Hz in either mono or stereo. By default, the sound is set to 48000 Hz stereo.
The higher the sample rate is, the larger the resulting file and higher the audio quality.
You can use the technical specifications of your playback device to help with this.
Advanced audio settings:
• 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.
Profiles:
• Low complexity: Data is present in a form that hinders different decoding
algorithms (noise replacement), but enables others (temporal adjustment noise
formation).
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.
AC3
If you have chosen an AVCHD, AVCHD transport stream or Blu-ray (H.264) from the
presets, "AC3 (Dolby Digital)" will be available.