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Weird Unwanted Change in Aspect Ratio/Size

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Ralph Chaney
Weird Unwanted Change in Aspect Ratio/Size
on Nov 29, 2012 at 9:38:27 pm

Aspect ratio changes -without my input- when played in Quicktime...!?

Here's the deal:

Working with a 1920x1080 DVCPROHD timeline.

1. Export, after rendering. (No conversion of any kind)
2. Shows as 1920x1080 in Finder, and plays as 1920x1080 in Finder (hit space bar)
3. Plays as 1920x1080 in Final Cut 7.0.3
4. BUT - when I open and play in Quicktime it plays as 1280x1080
5. AND - If I send to compressor to convert to "50% of source", it comes out squeezed to 640x540, same ratio as 1280x1080.

So:
Final Cut 7 and the Finder treat it as 1920x1089
Quicktime and Compressor treat it as 1280x1080

somebody HELP me! (...voice of Jim Carey in The Mask)

Thanks!

-> Ralph


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Dave LaRonde
Re: Weird Unwanted Change in Aspect Ratio/Size
on Nov 29, 2012 at 10:45:15 pm

DVCPro HD at 1080 isn't 1920 pixels across, it's 1280 pixels across. Go look at the actual dimensions of the video in FCP Browser.

If you want 1920x1080, you can make a custom preset in Compressor. Come to think of it, one may already exist.

Dave LaRonde
Former Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Ralph Chaney
Re: Weird Unwanted Change in Aspect Ratio/Size
on Nov 29, 2012 at 11:11:37 pm

Thanks.

I usually work in ProRes, so thanks for the DVCPROHD 1280 info.
I used Compressor and got VERY STRANGE - inconsistent results!
(at least inconsistent with my understanding of how Apple's video products really work)

I sent a DVCPROHD test to Compressor from the timeline, and forced it's setting to 1920x1080.

In Final Cut: It STILL shows up as 1280x1080, as per bin info.
In Quicktime: It shows up as 1920x1080, as per Info window.

Remember - a straight export from the timeline yields a Quicktime-interpreted file of 1280x1080.

**Perhaps Compressor adds some kind of cueing code that tells Quicktime to see it at 1920x1080?

Do you know anything about this?


(The TV station is requesting it in DVCHDProHD 1920x1080, so I'll use a Compressor 1920x1080 version of the show since Quicktime is interpreting it that way and they want a Quicktime file.)

Today's Lesson:
Learn more about DVCHDPro -and/or- Always use ProRes.

-R.

-> Ralph


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