You use the Audio pane to set the audio track quality, sample rate, quality, and bit rate
of the MPEG-4 output file.
Sample Rate pop-up
Bit Rate slider
Use the following buttons and slider to make more detailed adjustments.
• Audio Enabled checkbox: Make sure that this checkbox is selected if you want the MPEG-4
Part 2 output format audio settings to be applied.
• Channels buttons: Choose the audio channel for your output media file to be either
mono or stereo.
• Mono: Choose this button for mono output.
• Stereo: Choose this button for stereo output.
• Sample Rate pop-up menu: Choose from one of the following sample rates: 8, 11.025,
12, 16, 22.05, 24, 32, 44.1, or 48 kHz. You can also choose Recommended to have
Compressor choose a sample rate that is suitable for the Channels and Bit Rate settings.
Note: If you choose Recommended, the sample rate is not determined until the
transcode actually starts.
• Quality pop-up menu: Choose one of the following for the audio quality of your output
• Low: This allows for fast transcoding, but it is at the expense of output file quality.
Creating MPEG-4 Output Files
• Medium: The audio quality is better than Low, but this takes longer to transcode.
• High: This is the best audio quality setting available. Use this setting when the audio
quality is important for the output media file and you don’t mind how long it takes
• Bit Rate slider and field: Move the slider to set the overall audio bit rate for your output
media file between the range of 16 kbps (2 KB/sec.) and 320 kbps (40 KB/sec.), or enter
a specific number in the accompanying field.