1080p30 QT file comes out 720X404 after Compressor

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Level 1

8 points

1080p30 QT file comes out 720X404 after Compressor

I've been doing this all along with no problems. But out of the blue, one of my QT movie files (which looks perfect in QT playback) when Compressed for DVD comes out real small (720X404).

I've tried different DVD compressor presets, but all make it come out the smaller size. This has worked fine all along. Don't know what the problem is.

Thanks.

Macbook and G5, Mac OS X (10.5.6)

Posted on Aug 2, 2010 11:08 AM

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Answer 1

Aug 2, 2010 2:44 PM in response to wireduck

What is the codec and image size of the original file? Are all the source files the same codec and image size?

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Answer 2

Aug 2, 2010 2:48 PM in response to wireduck

Anamorphic 16:9? That's the size that gets reported in QT as I recall. The unstretched footage is actually 720x480, and depending on your TV display, actually comes out to 720x404 or 853x480 when shows "full size." AFAIK, there is no problem with the size you are seeing reported.

Eddie O

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Answer 3

wireduck Author

Level 1

8 points

Aug 2, 2010 4:10 PM in response to Edward A. Oates

Well I think I just had some brain freeze or something.
The original file was H.264 1080p.

But I think the compressor output for the mpeg-2 is correct at 720 X 404. Yes?
I was just thrown off by how much smaller it was. But if I understand it correctly, that's the right size for an SD DVD.

If not, then I'm back to my confusion.

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Answer 4

Aug 3, 2010 10:18 AM in response to wireduck

That is the correct size. Consider that the standard 4:3 SD frame is 720x480. On a real display, you can't get more than 720 horizontally, so once it is stretched to place the black bars (letter box) top and bottom, you get 720x404.

On many quadrupling systems (960p) or HD systems (1080 i or p), you can wind up with 854x480 actual resolution, with the 720 horizontal samples stretched out, with no loss of vertical information (you get the whole 480 lines); On non-anamorphic widescreen DVDs, there are just the 404 (or less, depending on actual aspect ratio), so on regular 4:3 TVs without additional processing, anamorphic or letterbox widescreen are about the same visually; but with processing and widescreen displays, anamorphic DVDs have greater vertical resolution.

Eddie O

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