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POGetting a codecs OSType from a UTType format in pyobjc
 

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  1. POGetting a codecs OSType from a UTType format in pyobjc
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    <p>I'm currently writing a script that processes batches of quicktimes, and its my first time using pyobjc (I have only written one other really simple script in actual objective-c). I need to be able to determine the four character OSType of the codec of the quicktimes so that I can properly use the same codec for images using addImage_forDuration_withAttributes_()</p> <p>Because pyobjc only has access to the obj-c frameworks, I can't access any of the C functions from it. I am able to get the string format UTType of the codec:</p> <pre><code>from objc import YES, NO, nil from Cocoa import * from QTKit import * movieAttribs = { QTMovieOpenAsyncOKAttribute: NSNumber.numberWithBool_(NO), QTMovieEditableAttribute: NSNumber.numberWithBool_(YES), QTMovieFileNameAttribute: "quicktime.mov" } clip, err = QTMovie.movieWithAttributes_error_(movieAttribs, None) track = clip.tracks()[0] print track.format() # u'Avid DNxHD Codec' </code></pre> <p>At this point I need to get the OSType, which for this codec would be 'AVdn' I'm assuming I want something like this: <a href="https://developer.apple.com/library/mac/#documentation/MobileCoreServices/Reference/UTTypeRef/Reference/reference.html" rel="nofollow noreferrer">https://developer.apple.com/library/mac/#documentation/MobileCoreServices/Reference/UTTypeRef/Reference/reference.html</a> But I don't have access to it in pyobjc</p> <p>My last resort is to shell out to <a href="http://omino.com/sw/qt_tools/man/qt_thing.html" rel="nofollow noreferrer">qt_thing</a> with something like this:</p> <pre><code>qt_thing --type=imco | grep "AVID DNxHD Codec" | awk -F: '{print $2}' # Result: AVdn </code></pre> <p>But this is slower and I would rather do it all in code. I must be missing something that is available to me in the Cocoa/QTKit side of things. Anyone with any experience?</p> <p>There is another SO question that again references using the C api to resolve the codec: <a href="https://stackoverflow.com/questions/5842920/find-out-the-codec-for-a-quicktime-movie">Find out the Codec for a Quicktime Movie</a>, but I can't obviously do that directly form pyobjc as far as I know.</p>
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