Re: Most efficient generic way to get at raw video data

• Subject: Re: Most efficient generic way to get at raw video data
• From: Darrin Cardani <email@hidden>
• Date: Mon, 18 Feb 2002 09:04:17 -0600

I'm also a QT newbie and have been following the discussion on using the
GWorld technique to get at video data (I have also searched through QT
Tech Q&A and Iceflow letters). From what I have read it seems to me that
allocating a GWorld, GetMovieNextInterestingTime, SetMovieTimeValue,
MoviesTask is the way to go when one is interested in video data frame
by frame as fast as possible (I've been allocating my own ARGB buffer
and using QTNewGWorldFromPtr). Is this the case ?
I now read about the possibility of using a MovieDrawingCompleteProc
call-back - intuitively I'd think this is more geared to processing
while the movie is playing as opposed to "munching on pixels as fast as
we can get at them" ?
What is the most efficient, generic way in QT to get at pixel data ?
I am interested in processing video data from tracks separately - would
the GWorld technique also be the way to go in this case (by disabling
other video tracks or anything else that produces video data) ?
I realise these are FAQs, but somehow none of the material I read gave
me a definite answer - I'd really appreciate a firm opinion on this from
the forum.

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