root@ip-10-87-17-174:~# MP4Box -info file.m4a
* Movie Info *
	Timescale 600 - Duration 01:00:14.696
	Fragmented File no - 1 track(s)
	File Brand M4A  - version 0
	Created: GMT Fri Mar  2 20:20:55 2012

File has root IOD
Scene PL 0xff - Graphics PL 0xff - OD PL 0xff
Visual PL: No visual capability required (0xff)
Audio PL: AAC Profile @ Level 1 (0x28)
No streams included in root OD

Track # 1 Info - TrackID 1 - TimeScale 22050 - Duration 01:00:14.696
Media Info: Language "Undetermined" - Type "soun:mp4a" - 77836 samples
MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x67
MPEG-2 Audio AAC LC - 1 Channel(s) - SampleRate 22050 - SBR SampleRate 44100
Self-synchronized