Highlight a clip you want to slow down. Go File>Interpret>Main. Change the frame rate from 50 to 25. You're done.
Unless, of course, the piece you want to slow down is just part of a much larger clip. That would be a mess. In which case you could import the big clip again, conform it to 25, and put it in its own folder -- "Slomo", perhaps. Then your problem becomes one of finding in & out points. AE really sucks at video editing.
Thanks for your answer.
Yeah, the problem is that this is a whole PP sequence imported to AE. All clips are edits of the whole footage, stitched together in Premiere and now imported to AE for further enhancement.
I am kind of looking for an automation not to have to resync everything manually...
But I guess there's no solution.
Not an automated solution.
But you CAN export individual, trimmed clips from PP as standalone lossless video files to preserve image quality. I like QT movies in PNG, Photo JPEG, Animation or ProRes 422 codecs for the chore.
Then import into AE, Interpret / Conform to the new frame rate, and place them in your comp. It's a little less painful.
But you CAN export individual, trimmed clips from PP as standalone lossless video files
Is there a way to automate that then? Or do I have to individually set in and out points for each clip to export?
As far as I know, exporting from PP can't be automated. Something like that would verge on the need for clairvoyant software. PP's good, but I don't think it's THAT good.