What is MP4? How can I use Mp4?

Question

What is MP4? How can I use Mp4?

Answer 1

mp4 is multimedia container format standard specified as a part of MPEG-4.  It is most commonly used to store digital audio and digital video streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. The official filename extension for MPEG-4 Part 14 files is .mp4, thus the container format is often referred to simply as MP4.MPEG-4 Part 14 is essentially identical to the QuickTime MOV format, but formally specifies support for Initial Object Descriptors (IOD) and other MPEG feature

MPEG-4 files with audio and video generally use the standard .mp4 extension.

The .m4p is usually used as the music format for the iTunes Store DRM copy protected content, while .m4a is now being used by the iTunes Store for DRM-free, unprotected music files and as an export option in QuickTime Pro

The common but non-standard use of the extensions .m4a and .m4v is due to the popularity of Apple’s iPod, the iTunes Store, and the Xbox 360 (in which support for mp4 formatted files was added in the fall 2007 Dashboard

Almost any kind of data can be embedded in MPEG-4 Part 14 files through private streams; the widely-supported codecs and additional data streams are

    * Video: MPEG-4 Part 10 (also known as H.264 and MPEG-4 AVC), MPEG-4 Part 2, MPEG-2, and MPEG-1.

    * Audio: AAC (also known as MPEG-2 Part 7), MP3 (also known as MPEG-1 Audio Layer 3), MPEG-4 Part 3, MP2 (also known as MPEG-1 Audio Layer 2), MPEG-1 Audio Layer 1, CELP (speech), TwinVQ (very low bitrates), SAOL (MIDI).

    * Subtitles: MPEG-4 Timed Text (also known as 3GPP Timed Text).

Some private stream examples include Nero's use of DVD subtitles (Vobsub) in MP4 files.

I hope this helps you.