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Avi on a memory stick
Posted: Thu Feb 24, 2011 5:08 pm
by Peter Stedman
I have been asked to put a 5 minute film onto a memory stick from Premiere CS4. I exported it as an .avi file and saved it as requested. It's to be shown on a club projector that has a USB socket.
The programme is 16x9 and when played from the memory stick in Quick Time player it only shows it as compressed to 4x3, the same with Nero. However Windows Media Play shows it OK as 16x9. Very odd - can anyone explain please?
Pete
Re: Avi on a memory stick
Posted: Thu Feb 24, 2011 5:39 pm
by Dave Watterson
Do not trust to ANY automatic settings!
In Nero right-click on the picture and look for the Aspect Ratio control. I believe there is a size control in Quicktime Pro but do not have a copy so cannot tell you for sure.
The important thing to bear in mind is that the AVI file itself always stores a (roughly) 4:3 picture. The playback system has to adjust the shape of the pixels when playing back, to change from one ratio to another. There are various ways of automating this but do not rely on any of them! (In your case it seems Media Player does work properly on automatic while the others do not.)
It is possible that the players on the computer you are using have had their default image shape set to fit the computer's screen.
Do not trust to ANY automatic settings!
Dave (don't hit me I'm not technical) W
Re: Avi on a memory stick
Posted: Thu Feb 24, 2011 7:14 pm
by Peter Stedman
Thanks for the reply Dave, I will follow this up.
Pete
Re: Avi on a memory stick
Posted: Thu Mar 24, 2011 4:53 pm
by tom hardwick
Dave's right - PAL DV footage is always 720 x 576, regardless of whether it's 4:3 or 16:9. It's just that the widescreen pixels are little horizontal rectangles and the footage has to be 'tagged' to tell the hardware what to project.
Same with HDV. This is 1440 x 1080 and is of course 16:9 by definition. HD is 1920 x 1080 which of course is also 16:9, so you can see that the pixel aspect ratios are different.
tom.