Hi everybody.
I have an HDV project on premiere CS4, with a lot of sequences and clips. I've just bought cineform and I would like to replace all my old m2t files with all the .avi files The name of the clips is the same. what is the quickest way to do that?

Welcome to the forums...

I won't comment on CS4, since i'm not quite there yet, but couldn't you open up a new project, and simply import the original project that the original file was made with??

I don't know a way to do a wholesale replacement unless you close the project and move all the source files to a different file path. When you reopen the project and it asks you where the files are, you can point PP to the Cineform file location. Not sure that'll work though because some Adobe products don't like it if you change the file type.

If you use a workflow like edit>effects>grade>output, then I'd wait and finish your edits in HDV. Then go in and "strip" out the unused components with Project>Remove Unused. You can then go back and identify only the clips in use and replace those.

You definitely want to create a new Cineform project and import your old project into it so you'll be working with a Cineform preset.