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Frame rate changing issues
This is probably a very simple question but it’s been bugging me for a while – is there a way to change frame rate, by changing the duration?
So for example, lets say I’ve rendered out a video as 30fps. I then import it back into AE. But I want it to play at 25. Normally I’d interpret the footage and change the frame rate that way, but this keeps the duration the same and then drops frames. Is there an alternative where the the video will play at 25fps, but the same frames will be displayed, meaning it will run slightly longer? Kind of like how when you create an image sequence you can import it at any frame rate.
Thanks!
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7 Replies
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Hey louis,
Not sure what the problem is for you. I just did exactly what you said and it worked perfectly. I first created a comp running at 30fps for a duration of 5 seconds and rendered. I then created a new comp running at 25fps, interpreted the rendered footage at 25fps (instead of the default 30) and the piece pulled out to 6 seconds when in the new comp.
Would you like me to create a video tutorial of the steps?
Cheers,
Brad———————————————-
ntertained.com.au – motion graphics and design -
Yup, yup, your right. That’s weird, I have no idea why I thought that never worked. Thanks for the offer of the tutorial, very kind, but as you say, it just works fine.
On a similar topic of questions that I’ve always wanted to ask but never gotten round to it, there is something else…
If say, I render out a video from a 3D app interlaced, and then import it into AE, if I then decide to increase or decrease the size of the footage, or add camera shake for example, does this not shift the interlacedness of the footage and produce some kind of flicker or strange result when it’s rendered out interlaced again from AE?
I don’t really like rendering out progressive from 3D and then combining it with AE animation, I’ve found that when this happens, the result is that the motion of the 3D has a slightly different feel to the animation done in AE, probably something to do with the fact that the fields in the AE bits are essentially different (ie if an object is moving right to left, it will be further over to the left on one of the fields on a single frame), while the 3D is kind of fake interlacing, in that the two fields will be of the same frame, just seperated. I suppose the alternative is just making everything progressive, and then interlacing it after it’s rendered out of AE. So this way at least it would all be ‘fake interlacing’
I hope I’m making sense…
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revisionfx has a re-interlacer for stuff to match up. I think its pretty cool.
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Yeah that’s pretty cool! So when would I use this? Like would I import the 3D render and interpret it with fields, then de, then re interlace? Or just import it with separate fields off, and the reinterlace? I’ve seen a lot of other posts on this, seems like kind of a contentious issue. I’ve also seen a lot of people talk about just rendering from 3D at double the frame rate and the interlacing it later as instead…Thanks for your help
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if you interpreted progressive 3-d as interlaced, you will lose quality because AE will try to deinterlace your footage a second time. That’s why you re-interlace first. I won’t retype all the techno stuff so just read here. 3-d to dvd or ntsc.
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Hey Louis,
If it were me I think I would keep everything in progressive full frames and then deal with interlacing based on the final export format.
Are there any disadvantages that I’m not aware of in going this route?
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ntertained.com.au – motion graphics and design -
Thanks for all your help…I suppose one disadvantage of doing everything progressive until the last render is that you’re kind of dealing with half as much resolution (temporal resolution that is). But then again some people prefer this because of the similarity in the way that film is formatted for TV. I’ve heard people complaining that properly interlaced motion graphics or animation looks slightly cheap. Anyway, think at some point I’ll have to get monitor and test all of this…! Thanks again for all of your help.
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