Because of its exceptional performance and quality, Advanced Audio Coding (AAC) is at the core of the MPEG-4, 3GPP and 3GPP2 specifications and is the audio codec of choice for Internet, wireless and digital broadcast arenas. AAC provides audio encoding that compresses much more efficiently than older formats, such as MP3, yet delivers quality rivaling that of uncompressed CD audio".
Best way to cut/trim/split m4a file :
GiliSoft Video Editor — Cut/trim/split m4a file.
1) Launch GiliSoft Video Editor
Once installed GiliSoft Video Editor, Launch GiliSoft Video Editor.
2) Select one way to cut m4a file
There are 3 ways to cut m4a file in the easy video editing software:
a) Easy Video/Audio Cutter - Cut one m4a file to several small m4a clips.
b) Batch Video/Audio Cutter - Cut wanted m4a clips from a lot of m4a files.
c) Advanced Video/Audio Cutter - Cut wanted m4a clip after video editing(added watermark, subtile...)
3) Load File
Click 'Add File(s)' button, Select "M4A - MPEG-4 Audio(*.m4a)" in its "Files of type" combo box.
Add your m4a file, GiliSoft Video Editor will preview your m4a file directly.
4) Select Start time, and End time.
5) Click 'Start' button to start to cut your m4a file.
GiliSoft Video Editor is very powerful m4a Splitter and m4a Cutter, split m4a, cut m4a without re-encode, So It is very fast and without any quality loss.