What is the difference between MPEG2、MPEG2 Blu-ray、MPEG2-DVD that are in "Export Settings" window？

[gg44078459]

What is the difference between MPEG2、MPEG2 Blu-ray、MPEG2-DVD that are in "Export Settings" window？

As follow:

[Richard M Knight]

One difference is that MPEG2 is a combined video and audio file, where as the others have a separate file for video and another for audio.

[John T Smith · Accepted solution]

mpeg2 = combined video & audio for computer playback

mpeg2-dvd = separate video & audio files to feed to a dvd authoring program

mpeg2-blue ray = separate video & audio files to feed to a blu ray authoring program

[Stan Jones]

What Richard and John said about the main differences. But also, the MPEG2 format has options that are not available in the DVD/BD versions. And from the opposite end, I found it difficult to ever get an MPEG2 Blu-ray compliant file if I started from the MPEG2 format.