Re: slow QTKit framegrabbing
Re: slow QTKit framegrabbing
- Subject: Re: slow QTKit framegrabbing
- From: "douglas a. welton" <email@hidden>
- Date: Wed, 15 Mar 2006 13:30:59 -0500
Evan,
I would recommend that you check out Core Video/Core Image (in
particular the Crop filter). See the CIVideoDemoGL example for
insight into how to use Core Image filters with Core Video. You may
even want to write your own filter. You can test it out in the
Quartz Composer without having to write much code at all.
Also, check out the Clipping Rectangle and the Playback Matrix in
QuickTime. Both of these may provide you with a way to accomplish
what you want with just a couple of extra lines of code. (something
like... clip the movie box to a 1 pixel width, then use the playback
matrix to translate your drawing to the location you want within your
movie box)
later,
douglas
On Mar 15, 2006, at 12:33 PM, Evan Harper wrote:
I'm working on a slitscan image maker, so it's a matter of using
only 1
vertical column of pixels from every new frame appended the right
edge of an
image. Basically throwing away 90% of the movie before display. I was
interested in working all cocoa, mostly to see how capable the API is.
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