How does Premiere handle off frame rates? at

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Old May 1st, 2015, 01:53 PM   #1
Join Date: Oct 2012
Location: Sydney, Australia
Posts: 1,148
How does Premiere handle off frame rates?

So, this mystifies me. I've done a few tests, but I'm still not sure what's going on and was wondering if someone actually knew. I'm having trouble finding info online.

Say I create a 25fps timeline. I drop 25fps clips on it, all well and good.

Now I drop a 24fps or 30fps clip on it. Somehow, Premiere automatically processes the clip to maintain duration. So, if the 24fps clip is exactly 1 second long, it'll still be exactly 1 second long in the 25fps timeline. Ditto with the 30fps clip.

So what exactly is it doing? Anyone know?

It seems to me what it could be doing is: speed change, interpolating frames, dropping frames, doubling frames, or some mix of the above. With the 24fps clip I tested, just clicking forward frame by frame, it seemed the first frame of each second got doubled. With a 10fps clip, it looked like some frames got doubled and some got tripled, but perhaps this was a speed change. With a 30fps clip, I'm assuming interpolation is involved on every third pair of frames or something like that, rather than speed change or dropped frames.
Adrian Tan is offline   Reply With Quote
Old May 1st, 2015, 10:04 PM   #2
Join Date: Jan 2013
Location: Austin, Texas
Posts: 1,383
Re: How does Premiere handle off frame rates?

Yes, it duplicates (or subtracts) frames to maintain duration within different timebases.
Gary Huff is offline   Reply

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