MP4 vs MPG, difference between MP4 vs MPG format

Comparison between MP4 vs MPG

File Extension	MP4	MPG
File Type	MPEG-4 Video File	MPEG Video File
Description	Movie or video clip that uses MPEG-4 compression, a standard developed by the Moving Picture Experts Group (MPEG); commonly used for sharing video files on the Internet.	Common digital video format standardized by the Moving Picture Experts Group (MPEG); typically incorporates MPEG-1 or MPEG-2 audio and video compression; often used for creating movies that are distributed on the Internet.
Developed by	Moving Picture Experts Group	Moving Picture Experts Group
Pros	1) The most widely-used video format; 2) Supported by many video programs and various hardware devices;	1) Provides quality video using smaller file sizes; 2) Most widely-used in recording videos;
Cons	The application to open the MP4 file must be able to recognize both the video and audio codec in order to play the media;	1) Sacrifices file size to realize in digital quality; 2) Sacrifices file size to realize in digital quality;
Help You Choose	Most of the cases, MP4 performs much better than MPG.	If you prefer smaller file size with acceptable video quality, MPG could be your choice.
Programs that open MP4/MPG files	Microsoft Windows Media Player Eltima Elmedia Player iOrgsoft Video Editor	Apple QuickTime Player Apple iTunes Arcsoft TotalMedia Theatre