Why is an MP4 file so much smaller then a mpeg file?

[The Doctor11]

I was just wondering why a MP4 file is so much smaller then a mpeg file. I had a mpeg file and converted it to a MP4 file. The original mpeg was 207 MB. But after the conversion it was 64.5 MB. I didn't see any changes in quality. Is there a change in quality?
Any answer is appreciated

 

[MacNut]

MP4 is a stripped down MPEG 4 file.

The main difference between an MPEG4 and an MP4 is their function. MPEG4 is a video encoding algorithm that is actually responsible for how the images are compressed and converted into data. In comparison, an MP4 is just a media container that was developed to hold the data that is encoded by an MPEG4. It does not deal with the actual video, thus it does not affect the resulting quality.

http://www.differencebetween.net/technology/protocols-formats/difference-between-mpeg4-and-mp4/

 

[The Doctor11]

Thank you