What is the difference between MPEG 2 and dvd?
Answers: MPEG-2 defines a family circle of codecs for audio and video.
The DVD format uses the Main level at Main profile MPEG-2 codec for video, but Dolby Digital for audio.
DVDs also own auxiliarry streams for closed captioning and special Index files for navigation. All this side information plus the audio and video streams, in a DVD, are encapsulated within a number of VOB files.
MPEG 2 is a compression format through which your wallet can be played. Every compression formats have different advantages and disadvantages.
I didn't infer what's dvd ?
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