
MPEG-4 Audio Export Options
When you export a movie to MPEG-4 format (by choosing File > Export and then choosing "Movie to MPEG-4"), you access the following options by clicking Options and then clicking Audio.
- Audio Format: Choose your audio compressor (codec) here. If your source movie has only one audio track and it is already compressed, you can choose "Pass through" so that the audio doesn't get compressed again.
- Data Rate: As with video, the more kilobits per second, the better the audio quality.
- Channels: Choose between mono (1 channel) or stereo (2 channels).
- Output Sample Rate: Available only with AAC audio. It's best to match the sample rate to that of the target device.
- Encoding Quality: Available only with AAC audio. The Good setting is optimized for the highest-speed encoding, for higher-quality, choose Best for 16-bit audio, or Better if your audio source is 24-bit.