On Aug 20, 2009, at 1:23 PM, Dana Collins wrote:
> > > > > On 8/20/09 2:39 PM, Bruce Johnson of john...@pharmacy.arizona.edu sent > >> >> >> On Aug 20, 2009, at 11:01 AM, Dana Collins wrote: >> >>> >>> I have a QT movie (.mov format) showing a demonstration of realtime >>> audio pitch manipulation that I want to use for class lecture. The >>> QT >>> original is at 27.8 MB - thought I'd port it to my iPod Touch for >>> convenience (I use an Apple A/V composite adapter for overhead >>> screen >>> projection on downloaded movies), so, in QuickTime, I select >>> "export" >>> then "movie to iPod", converting the format to .m4v - I noticed it >>> took an exorbitant amount of time (27 minutes, when the movie clip >>> is >>> maybe 12 minutes) and then left me with an m4v file weighing in at a >>> whopping 80.5 MB! I was sure the file sizes would be exponentially >>> the >>> reverse (isn't m4v a form of encoded "compression" as mp3 is to >>> audio?). >>> Does this sound right? Should I be using a different exporting >>> algorithm? >> >> It's entirely possible to do this, as QT might well be upscaling the >> video, because convert .mov to iPod gets you specifically >> formatted .m4v files. >> >> Without knowing what the original specs are, it's hard to tell, but >> if >> it was small (320 x 240 or something) it could well have been smaller >> in the original; .mov files can contain considerable compression as >> well. >> >> To shrink it down size-wise you'll have to use custom settings. > > > Thank you for responding, Bruce. Let's see if I can be clearer. The > movie > was found on YouTube, and was downloaded as (I am sure) a Flash > movie via > Perian, then ported to QuickTime. QT's movie inspector says this > about the > resulting file: > > H.264 (Perian), 512 x 288, Millions > AAC, Stereo, 44.100 kHz > With normal size stated as: > 512 x 288 pixels (actual) > > What I want to do is "shrink" it, i.e. Do the same to it as say MP3 > or Lame > (or yet another lossless compressor - yes, I know MP3 is not > lossless per > se, but I'm offering an analogy) does to uncompressed audio - would > that not > be the *intent* of porting such a document to an iPod? > Yes and no. Porting to the iPod is a matter of compression (for things like DVD's) and conversion to the correct format. I've tried converting some .flv video to .mv4 manually with QT pro and have ended up with gigantic file sizes; I clearly don't know what I'm doing... Send me the youtube ID or URL, I'll see what cosmopod will make of it, as it makes pretty well optimized movies. (or you can try cosmopod yourself <http://www.cocoamug.com> -- Bruce Johnson University of Arizona College of Pharmacy Information Technology Group Institutions do not have opinions, merely customs --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed Low End Mac's G3-5 List, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com To unsubscribe from this group, send email to g3-5-list-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
