Audio encoding

To ensure renditions in the multiple-bitrate set can be played back appropriately, you must encode each rendition’s audio track using the same sample rate and bitrate. Using the same sample rate avoids issues such as audio/video sync, as most devices rely on the audio track’s time clock to control playback. Using the same bitrate avoids issues such as audible “pops” when the device changes from one rendition to another.

The audio codec used with H.264 is generally AAC.