I agree. It's obvious that a video can be manipulated because it's data. But a Virus must be activated. It activates when you launch a .exe or with MS Office's Macros (due to a bug).
But in a video, it seems difficult. The only think I can imagine is that the videoplayer has a bug (like MS Office) and a virus can use it. But this is also rare, because a normal player is reading the information of the file and translating it to show the movie, not executing that information (like EXE or Macros).
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Pentium III 1Ghz, MSI GeoForce 4, Windows 2000 Pro
Pete's OpenGl Driver 1.71
Internal ePSXe SPU or Pete's DSound 1.15
Internal ePSXe W2K CDR or SaPu's CD-ROM 1.0
Bios scph 7502