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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