Average Bitrate Encoding (ABR)

Select this option to encode the audio using an average bit rate. The specific bitrate value can be selected from the bitrate drop-down list.

Variable Bitrate Encoding (VBR)

Select this option to encode the audio using a variable bit rate, which is considered to produce superior results to ABR encoding. For this mode you only need to select a Quality value from the respective drop-down list. Values range from 10% to 500%, with higher values producing higher quality audio and a larger output file size.