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
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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.
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Old May 1st, 2015, 10:04 PM   #2
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Re: How does Premiere handle off frame rates?

Yes, it duplicates (or subtracts) frames to maintain duration within different timebases.
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