Re: Converting mp3 audio with QTKit

Subject: Re: Converting mp3 audio with QTKit

From: Stewart Milberger <email@hidden>

Date: Tue, 30 May 2006 12:08:21 -0600

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A little off topic, but a potential software enhancement would be a version of the call that returns a NSError explaining why it returned NO :

-(BOOL)writeToFile:(NSString *)fileName withAttributes:(NSDictionary *)attributes error:(NSError **)errorPtr

I like this convention and use it my own code a lot.

Stewart Milberger

Megaptera, Inc. (www.megaptera.com)

On May 30, 2006, at 11:46 AM, patrick machielse wrote:

Op 30-mei-2006, om 18:24 heeft Daniel Steinberg het volgende geschreven:

At 5:42 PM +0200 5/30/06, patrick machielse wrote:

This code seems to work most of the time, but quite often it simply doesn't and the call to writeToFile:withAttributes: returns NO.

Have you made sure that the movie is fully loaded before you start your export?
See Tech Note 1469: <http://developer.apple.com/qa/qa2006/qa1469.html>

Thanks a lot (really!). That solved the issue I had. I'll submit a documentation enhancement asking that the description of writeToFile:withAttributes: mentions this issue/feature.

At the moment the conversion code is in a separate tool, but ideally I would execute it on a separate thread in my application. However, there seems to be a problem with creating QTMovie objects on threads other than the main thread. From what I've read in the Quicktime documentation, exporting operations should be (mostly?) thread safe. Is there a way to use QTMovie on separate threads?

patrick

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References:

>Converting mp3 audio with QTKit (From: patrick machielse <email@hidden>)

>Re: Converting mp3 audio with QTKit (From: Daniel Steinberg <email@hidden>)

>Re: Converting mp3 audio with QTKit (From: patrick machielse <email@hidden>)