Avi on a memory stick

A forum to share ideas and opinions on the equipment and technical aspects of film, video and AV making.
Post Reply
User avatar
Peter Stedman
Posts: 275
Joined: Wed Oct 17, 2007 8:06 am
Location: Wiltshire

Avi on a memory stick

Post 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
User avatar
Dave Watterson
Posts: 1935
Joined: Sun Jan 28, 2007 11:11 pm
Location: Bath, England
Contact:

Re: Avi on a memory stick

Post 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
User avatar
Peter Stedman
Posts: 275
Joined: Wed Oct 17, 2007 8:06 am
Location: Wiltshire

Re: Avi on a memory stick

Post by Peter Stedman »

Thanks for the reply Dave, I will follow this up.
Pete
tom hardwick
Posts: 920
Joined: Mon Jan 29, 2007 9:59 am

Re: Avi on a memory stick

Post 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.
Post Reply