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June 2008, Week 3

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From:
LLTI-Editor <[log in to unmask]>
Reply To:
Language Learning and Technology International Information Forum <[log in to unmask]>
Date:
Tue, 17 Jun 2008 13:58:27 -0400
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Dick,
	One key question is what software are you using to compress with? For  
long movies at 720x480, we've gotten the best results with  
Compressor's preset codecs (with minor tweaks). No problems with the  
lag/sync problem you refer to; QTPro and Squeeze both had them (tho'  
presumably at a deep level it's all pretty much the same with the H264  
codec).
	Another issue is the version of QT and H264 playback on computers  
with dedicated video cards vs. without. With all of the different  
versions of QT out there, it'd be good to see how the results vary.  
The H264 codec is computationally intensive so playback on 3+ year old  
hardware, and many laptops can be an issue (for those you may want to  
encode using an older codec (e.g. Sorenson) or at 320x240.
	On the server a place to look is hard drive speed (best practice is  
not to stream off the boot drive), on a deFragged HD, and of course on  
the fastest network you can. If you're on Gigabit Ethernet, make sure  
that setting is selected in QTSS.
	Let us know what finally works, but do know that many others have  
dealt with the issue. And some solve it by simply breaking the movie  
up into 20-30 minute segments. --jeff

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