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dan freshman
odd quicktime resolution problem after compression
on Jul 31, 2009 at 5:04:51 pm

Hello,

I'm not exactly sure of all the qualities of the original footage, but some of it was pal. i've compressed in AE to photo jpeg ntsc 720x486 and get some odd results in quicktime. When I look at the quicktime inspector, it says Format: "photo jpeg 720x486 (640x480)" while at the bottom saying "normal size 640x480". I have no idea why it is choosing this resolution.It is causing some problems for me in some other programs. Anybody have any idea why this is happening or how to change it w/ out compressing again?

thanks
dan


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Daniel Low
Re: odd quicktime resolution problem after compression
on Aug 1, 2009 at 9:41:16 pm

Click here:

__________________________________________________________________
There are no significant bugs in our released software that any significant number of users want fixed. … I'm saying we don't do a new version to fix bugs. We don't. Not enough people would buy it. You can take a hundred people using Microsoft Word. Call them up and say "Would you buy a new version because of bugs?" You won't get a single person to say they'd buy a new version because of bugs. We'd never be able to sell a release on that basis.

Bill Gates. Focus Magazine No. 43 (23 October 1995)


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dan freshman
Re: odd quicktime resolution problem after compression
on Aug 3, 2009 at 5:19:23 pm

thanks for posting that link, it was helpful in learning about this issue and PAR, however it does not exactly solve my problem.


I am working on a project where we are concatenating a series of movies in Quicktime Coffee and if the resolution is off, we encounter problems down the line. Specifically you can see in the properties of our concatenated movie in quicktime that if we append clips that have that different figure resolution: "Format 720x486(640x480)" in parenthesis then we end up with multiple audio tracks and multiple video tracks in the quicktime clip properties window. This is what causes problems.

Anyone have any explanation or fix to this?

thanks
dan


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Daniel Low
Re: odd quicktime resolution problem after compression
on Aug 3, 2009 at 6:14:47 pm

[dan freshman] "Quicktime Coffee"

What is that?

What are you doing once you have finished concatenating, are you saving the clip as self contain or exporting out as a fresh new movie?





__________________________________________________________________
There are no significant bugs in our released software that any significant number of users want fixed. … I'm saying we don't do a new version to fix bugs. We don't. Not enough people would buy it. You can take a hundred people using Microsoft Word. Call them up and say "Would you buy a new version because of bugs?" You won't get a single person to say they'd buy a new version because of bugs. We'd never be able to sell a release on that basis.

Bill Gates. Focus Magazine No. 43 (23 October 1995)


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dan freshman
Re: odd quicktime resolution problem after compression
on Aug 3, 2009 at 6:43:40 pm

QTCoffee is a collection of command line applications for manipulating QuickTime movies They can join (concatenate), multiplex, and split movies; they also perform various modifications and editing. http://www.3am.pair.com/

The resulting concatenated movie is just a reference file and does not create a fresh new movie. I then bring my movie into DVD studio pro and when I drag this asset into a track, the clips with resolution discrepancy do not show up and my video and audio tracks do not line up.

dan




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Daniel Low
Re: odd quicktime resolution problem after compression
on Aug 3, 2009 at 6:52:54 pm

Cool, thanks, I'd not heard of that before.

[dan freshman] "I then bring my movie into DVD studio pro and when I drag this asset into a track, the clips with resolution discrepancy do not show up and my video and audio tracks do not line up. "

I'd kind of expect exactly that to happen. Can I suggest you flatten the movie by exporting as a fresh new self contained movie and see what happens?




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dan freshman
Re: odd quicktime resolution problem after compression
on Aug 3, 2009 at 7:07:16 pm

That doesn't work. I get the same multiple track listing in the properties window and both resolutions still exist in the inspector window.

Are there any settings that would be different for a quicktime export to make this work?


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Daniel Low
Re: odd quicktime resolution problem after compression
on Aug 3, 2009 at 7:51:41 pm

Do you understand that 720x486 is a non-square pixel version of 640x480 square pixel?

Why don't you just import the clips individually into DVDSP? and lay them on the same track?

__________________________________________________________________
"There's no chance that the iPhone is going to get any significant market share. No chance."

Steve Ballmer To USA Today


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dan freshman
Re: odd quicktime resolution problem after compression
on Aug 3, 2009 at 8:49:08 pm

Yes I understand that. But not really what that implies...Does that it was shot on footage that used rectangular pixels and that be converted? If not, doesn't all footage have an equivalent in square/non-square pixels, why can't It be one or the other, not both?


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dan freshman
Re: odd quicktime resolution problem after compression
on Aug 3, 2009 at 9:07:11 pm

And also, if NTSC and PAL both use rectangular pixels, at what point do square pixels get utilized. As mentioned in your first post's link, is that 640X480 only for computer monitors?


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Daniel Low
Re: odd quicktime resolution problem after compression
on Aug 3, 2009 at 9:20:16 pm

It was shot using a sensor that uses non-square pixels.

Computer displays use square pixels.

Quicktime is telling you that it was natively 720x486 (480) but it is displaying it at 640x480

in the same way, HDV uses 1440x1080 but when displayed on an HDTV or computer monitor correctly it's 1920x1080

__________________________________________________________________
"There's no chance that the iPhone is going to get any significant market share. No chance."

Steve Ballmer To USA Today


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