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Mpeg-2's outputting 640x480 files??

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lukeinvt
Mpeg-2's outputting 640x480 files??
on Aug 6, 2005 at 12:12:22 am

I am using Compressor 1.2.1 on a G4 Powerbook.
I have been editing skateboarding footage shot on DV with Final Cut Pro
Using the Mpeg-2 60 min HQ encode width 720, height 480, aspect ration 4:3, field dominance bottom first I still get a file that says 640x480.

And actually this has not presented itself as a problem because DVD Studio Pro recognizes the files as 720x480.

My concern is this, I have brought the compressed Mpeg-2's into FCP sot that I may preview them on my broadcast monitor . They import as 640x480, which makes me think that DVDSP is stretching the files to 720x480, there by compromising quality.

Whatever the case may be, I have the preset set up to output a 720x480 file, but finder says it's 640x480 and FCP agrees.

Any help?

Luke


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lukeinvt
It Occurs to me
on Aug 6, 2005 at 12:54:41 am

NTSC DV footage should have a 3:2 aspect ratio, correct?
The only options compressor gives me are 16:9 and 4:3.

Why is that?


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Ben Waggoner
Re: It Occurs to me
on Aug 9, 2005 at 11:20:19 pm

Actually, all is well.

While NTSC DV has a 3:2 pixel ratio (720x480), the image aspect ratio is always either 4:3 or 16:9, which is why you have those settings. Its being encoded internally as 720x480. The 640x480 QuickTime reports is the post-aspect-ratio-correction size - QuickTime Player squishes the video to 640x480 to provide the 4:3 aspect ratio.

So, don't fret it. It's all working according to plan.


My Book: http://www.benwaggoner.com/books.htm
Squeeze and ProCoder tutorials: http://www.classondemand.net/benwaggoner/
Compression Class at Stanford: http://www.digitalmediaacademy.org/compression.html


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