128kbps M4a(3.45 Mb) -

Standing for MPEG-4 Audio, this container usually uses the AAC (Advanced Audio Coding) codec. It is designed to be the successor to the MP3 format, offering higher sound quality than an MP3 at the same bitrate.

The size of an audio file is determined by the bitrate multiplied by the duration. (roughly ). 128kbps m4a(3.45 MB)

An audio file encoded as a with a file size of 3.45 MB typically represents a standard-length song of approximately 3 minutes and 46 seconds . Technical Overview Standing for MPEG-4 Audio, this container usually uses