Apple Compressor 2 - Manual (Page 156)

156 Chapter 11 Creating MPEG-4 Output Files
Audio Pane
You use the Audio pane to set the audio track quality, sample rate, quality, and bit
rate of the MPEG-4 output file. Use the following buttons and slider to make more
detailed adjustments:
 Audio Enabled checkbox: Make sure that this box is checked 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.
 “Sample rate” pop-up menu: Choose from one of the following sample rates:
8, 11.025, 22.05, 24, 32, 44.1, or 48 kHz.
 Quality pop-up menu: Choose one of the following for the audio quality of your
output media file:
 Low: This allows for fast transcoding, but it is at the expense of output file quality.
 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 to transcode.
 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.) to 256 Kbps (32 KB/sec.),
or enter a specific number into the accompanying field.
“Sample rate”
pop-up menu
Bit Rate slider