I'm currently working in Premiere CS5.5 on a series of videos at 24fps that require lots of stock clips that have different framerates.
Usually, if a clip looks smooth in the timeline, I leave it as it is. If it's juddery, I intepret it as 24fps.
90% of the time that works, but I often get problem clips, usually 5/100 in an 8 minute video.
The last or second to last frames will hang or skip forward and back, or every fifth frame will be a duplicate etc.
Is this just the nature of forcing clips into a 24fps timeline or is there a surefire way to get a locked 24fps? Is it something that's fixed in later versions of Premiere?
I've tried rendering the clips separately a few ways, eg. putting a 25fps clip in a 25fps timeline and rendering to 24fps, and interpreting a 25fps clip as 24fps and rendering to 24fps... sometimes that works, sometimes not.
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It depends what the cause of the "juddery" is in the first place . Then you fix the actual problem.
The examples you gave sound more like source issues
eg. When every 5th frame is a duplicate, you should decimate the duplicate, then it will become a 23.976p clip, and that will interpret to 24.0p perfectly
The skipping back and forth might be a decoding issue with long GOP . Try encoding it to an I-frame format then re-importing , then interpreting (or you can fix it before importing).
I'll post some examples once I've recovered from this edit! I spent 3 hours at the end going through ironing out the framerate.
What have you selected for Time Interpolation?