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AVCHD 30p vs. 60i questions
When I import footage from my Canon Vixia AVCHD camcorder into Premiere Pro CS4 it says the frame rate of the footage is 29.97 regardless of whether the footage was shot in 60i mode or 30p mode.
1) Does this mean my Canon camcorder isn’t smart enough to correctly tag the videos or does it mean Premiere Pro lacks the ability to properly interpret footage?
2) If I use 60i footage, should I interpret it as 59.94 frames/second when I import it into Premiere Pro?
3) Is there ever a reason to shoot in 60i if my goal is to just post video to the web?
4) What’s the best way to export an AVCHD project from Premier without further compression if I’m going to use Sorenson Squeeze to actually compress the files before uploading them?
Thanks in advance!
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3 Replies
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It’s probably nit true 30p. I’d say like most prosumer gear it’s 30p embedded in 60i. So there is nothing wrong it’s correct technically. The “look” is 30p not actual 30 prgressive frames. So ppro sees the digital tags and tell u it’s 60i.
– Jon Barrie
Jon Barrie
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http://www.jonbarrie.net
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Go with 30p, most of the time you render webstuff out at a lower framerate anyways, also youtube and other sites like to mess up interlacing with their embedding. At least with 30p you can sample down without pixelation or overdimming.
“Oop, I think my render is done!”
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Sorry for resurrecting an old-ish post but it seems like the original poster is confusing _frames_ per second with _fields_ per second.
The “30” in 30p is referring to _frames_ per second.
The “60” in 60i is referring to _fields_ per second.
Both the “30” and “60” are actually rounded off numbers. They are actually 29.97 and 59.94 respectively. I guess marketing decided that “30p” sounded better than “29.97p”. 🙂
2 fields makes up 1 frame. So two 59.94 hz fields is in fact one 29.97 hz frame after deinterlacing.
So Premiere is correct – 30p and 60i are both 29.97 frames per second.
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