
3G Audio Export Options
When you export a movie to 3G format (by choosing File > Export and then choosing "Movie to 3G"), you access the following options by clicking Options and then clicking Audio.
- Audio Format: 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).
- Frames per sample: Available only with AMR audio, this option enables exported audio data to be packed more efficiently.
- Silence detection: Available only with AMR audio, this option detects audio portions with low signal levels and adjusts the data rate of the output accordingly.
- 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. By choosing Best, you can get higher-quality audio but it takes longer to encode.