Thats Great! This should be posted on wikipedia.
--- In [email protected], Mike Boom <[EMAIL PROTECTED]> wrote:
>
> At 07:21 AM 10/30/2006, Taky Cheung wrote:
> >Isn't all videos are just sequence of images synched up with audio?
>
> Most video compression schemes these days (MPEG2, H.264, and so on)
> work with GOPs (Group Of Pictures) which aren't simply a sequence
of
> images. A GOP starts with a single frame (an index, or I, frame)
that
> contains a single picture in all of its detail. The following
frames
> (B and P frames) contain only information about what has changed
> since the last frame, so they require far less data because in
video
> images typically don't change much from frame to frame.
>
> An HDV camcorder records using MPEG2 with GOPs, and when you edit
HDV
> in Premiere you're working in MPEG2 as well (at least in PP 2.0).
> That's why playback feels a tad quirky sometimes. The camcorder or
> Premiere has to find an index frame before it can figure out the
> frames following it.
>
> Mike Boom
>
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