User Manual

Chapter 5 Custom settings and output formats 118
If you don’t want to edit any other attributes, you can assign the MPEG-4 setting to any source
media le in the usual way. For more information, see Assign settings to source media on
page 32. Otherwise, go to the next stage to edit MPEG-4 audio settings.
Stage 2: Open the Audio tab and adjust MPEG-4 audio settings
You use the Audio tab to set the audio track quality, sample rate, and bit rate of the MPEG-4
output le.
1 To open the Audio pane, click the Audio button in the MPEG-4 Encoder pane of the Inspector.
Sample Rate
pop-up menu
Bit Rate slider
2 Adjust the following MPEG-4 audio settings:
Audio Enabled: Make sure that this checkbox is selected if you want the MPEG-4 Part 2 output
format audio settings to be applied.
Channels: Select mono or stereo output for your audio le.
Sample Rate: Choose 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 based on the Channels and Bit Rate settings.
Note: If you choose Recommended, the sample rate is not determined until the transcode
actually starts.
Quality: Choose the audio quality of your output media le:
Low: This setting allows for fast transcoding, but at the expense of output le quality.
Medium: The audio quality is better than Low, but transcoding takes longer.
High: This is the best audio quality setting available. Use this setting when the audio quality
is important for the output media le and you don’t mind how long transcoding takes.
Bit Rate: Drag the slider to set the overall audio bit rate for your output media le
between 16 kbps (2 KB/sec.) and 320 kbps (40 KB/sec.). You can also enter a number in the
accompanying eld.
If you don’t want to edit any other attributes, you can assign MPEG-4 settings in the usual way.
For more information, see Assign settings to source media on page 32. Otherwise, go to the next
stage to edit streaming settings.