MP4 is often referred to as MPEG-4, MPEG-4 Part 1, MPEG-4 Part 14 or MPEG-4 Part 12. Common extensions for MP4 files are .mp4, .m4a, .m4p, .m4b, .m4r and .m4v.

Not necessarily. Although the most common MPEG audio format, there are also other standards, both previous to and successive to MP3. MPEG Audio Layer 1 (MP1) and MPEG Audio Layer 2 (MP2), as well MPEG-4 Part 3 could be classified as an "MPEG audio file."

Because you have a MP3 player that can only play MP3 audios, but M4A can't play on a MP3 player because M4A is an MPEG 4 and your MP3 player is a MPEG 3.

The MPEG 4 is to powerful or high for the MPEG 3 (4 is bigger than a 3).

No. MP3 is audio only. MPEG is the video version (MP3 stands for MPEG-1 Audio Layer 3, and is the audio part of MPEG video files)

mpeg 4