MPEG-4 Part 14
MPEG-4 Part 14 or
MP4 is a digital multimedia format most commonly used to store video and audio, but can also be used to store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the
Internet. The only official filename extension for MPEG-4 Part 14 files is
.mp4, but many have other extensions, most commonly .m4a and
.m4p.
M4A (audio only) is often compressed using
AAC encoding (lossy), but can also be in
Apple Lossless format.
M4P is a protected format which employs
DRM technology to restrict copying. MPEG-4 Part 14 (formally
ISO/
IEC 14496-14:
2003) is a standard specified as a part of
MPEG-4.
Some devices advertised as "MP4
Players" are simply
MP3 Players that also play
AMV video or some other video format, and do not necessarily pl
...