The keyframes themselves are also compressed like individual JPEG images BTW. What I was trying to say that it is normal that any piece of data containing a sequence of MPEG or MPEG2 frames can be played back.
Examples: Uncompressed DVD disc images, MPEG2 in Matroska (even if Matroska splitter is not installed), MPEG in (unprotected) Advanced Streaming Format, MPEG music in Darkstone videogame datafile music.mtf, MPEG speech in Septerra Core videogame datafiles speech.db, etc.
How would the player know that it's, for example, a MPEG4 ASP video interleaved with custom Windows Media Audio and some unrecognized container overhead bytes if you don't provide the file header?
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And is not an MPEG file, it's the image of a (S)VCD disk.
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Aren't both the same?