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From: peirce@outpost.UUCP (Michael Peirce)
Newsgroups: comp.sys.mac.programmer
Subject: using QuickTime compression
Message-ID: <0B01FFFB.hsyi3b@outpost.UUCP>
Date: 11 Jun 91 01:02:21 GMT
Reply-To: peirce@outpost.UUCP (Michael Peirce)
Organization: Peirce Software
Lines: 44
X-Mailer: uAccess - Mac Release: 1.1.b3

I'm trying to try work with the alpha QuickTime that Apple gave out
at the WWDC.

Specifically I'm trying to use JPEG to compress a picture.

I looked at the sample code provided on the CD-ROM called 
SampleCompressPicture.  It looked fairly straightforeward to emulate.

I tried the following code fragment:


	cPict = (PicHandle) NewHandle(sizeof(Picture));
	if ((stat = CompressPicture(rPict,cPict,codecMaxQuality,'jpeg')) != noErr) {
		NumToString(stat,statStr);
		DebugStr(statStr);
	}


This always returns to me -8960, codecErr, general error.

I also tried the FCompressPicture variation with the same results.

I'm including the same include files that the sample program did and
the programs found on the CD-ROM run on my machine and will do JPEG
compression (and it looks great BYW).

The one difference between my code and the sample is that rather than
asking the user for settings, I simply ask for the best that JPEG
can supply.

Has anyone been working with QuickTime yet?

-- michael

P.S.  On a related note, I tried to use the documented Gestalt selector
too, but this always crashed on me.  The code line before was another
call to Gestalt that worked fine.

Maybe this really is alpha software :-)

--  Michael Peirce         --   outpost!peirce@claris.com
--  Peirce Software        --   Suite 301, 719 Hibiscus Place
--  Macintosh Programming  --   San Jose, California 95117
--           & Consulting  --   (408) 244-6554, AppleLink: PEIRCE