I am using a template, which has a video, but this is in green, which may be the solution, of course thank you very much
We can't know. You have not provided any info about your footage, your settings, what effects you use, what system and so on. In fact we don't even know the excact version of AE you use.
As Mylenium said, we need to know a lot more to help you. Please provide answers to the questions listed here:
Retrieving data ...