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
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