After receiving my copy of iLife ’08 I began playing with iMovie ’08. Despite the controversy surrounding iMovie 08 vs iMovie HD, I find the skimming UI Apple has introduced quite good.
I have an internal project that could use this style of movie selection and previewing so I decided to create my own implementation using Cocoa and QTKit. Here’s what I came up with:
I’ve been able to implement these features:
- thumbnail scaling
- timeline scaling
IMPORTANT: this code only seems to perform well with movies encoded using the Apple Intermediate codec. LNSQTSkimmerView relies on QTMovie‘s frameImageAtTime: method to display thumbnail frames. This method can become very slow for movies encoded in other formats (i.e. H.264).
iMovie ’08 uses the Apple Intermediate codec and also pre-generates thumbnails for its skimming view. Pre-generating thumbnails may allow my code to operate well with any QuickTime movie.
There are a couple of things in iMovie 08’s skimming view that I’ve not yet implemented:
- embossed frames around thumbnails.
- audio scrubbing as you skim over a movie
- displaying multiple movie clips on one skimmer view
This code uses the NSBezierPath+PXRoundedRectangleAdditions Objective-C category from Andy Matuschak’s Pixen project.
MIT License for LNSQTSkimmerView Copyright (c) 2007 Mark Alldritt All Rights Reserved
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