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mp4 oddness
After installing QT7 on my iBook, Compressor has started doing something odd.
Whenever I encode to an mp4 file, it instantly defaults to a 768×576 frame size (I’m in PAL land here…!). No matter what I do it always defaults back – even if I create a completely new preset. And funnily enough, none of the files I’m trying to encode are 768×576, they’re 720×576. So it’s putting them into a completely different frame size!
This happens whether I’m going straight from the FCP4.5 timeline, a ref movie or self-contained QT.
Any ideas? I’m running 10.3.9 at the moment – haven’t taken the great 10.4 leap yet – no time for a fresh install just yet 🙂
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4 Replies
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I think this is the frame size when viewed on a computer screen, which uses square pixels, rather than video, which uses rectangular pixels. If it didnt make this adjustment, the image would look stretched.
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I don’t know if this is also true for MPEG-4, but for MPEG-2 playback Quicktime player has always (correctly) scaled PAL and NTSC material to the square pixel equivalents. It’s a playback behavior, not the actual frame size of the file.
Adolfo Rozenfeld
Buenos Aires – Argentina
https://www.adolforozenfeld.com
adolfo@adolforozenfeld.com -
I don’t know if this is also true for MPEG-4, but for MPEG-2 playback Quicktime player has always (correctly) scaled PAL and NTSC material to the square pixel equivalents. It’s a playback behavior, not the actual frame size of the file.
Adolfo Rozenfeld
Buenos Aires – Argentina
https://www.adolforozenfeld.com
adolfo@adolforozenfeld.com -
Yeah, I know about the square vs rectangular pixels, but the problem that I was having was that it was defaulting to 768×576 WHATEVER frame size I wanted.
If I tried to encode to 320×240, it would still default back to 768×576. Sorry, don’t know if that was clear enough in my original thread…. 🙂
However, after having another go last night it seemed OK. Which is a bit odd. I remember I had this same issue a while back and presumed it had just been cured with whatever Compressor update I did at the time…
Oh well, it seems to be working now.
Thanks anyway!
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