Thanks, everyone. I should be more specific, and it leads to a second question. I’ve edited a 93-minute feature that the cinematographer now wants to put a widescreen 2.35:1 mask on. I need to upload the film to him, in Quicktime format, so he can create a new FCP timeline on his own, apply the mask and then, using the blade tool to create subclips in the QT movie, reposition the shots up or down to fit correctly (to his eye) within the letterbox. He’ll then upload the timeline back to me and I’ll paste the repositioned attributes onto the actual color-graded clips on my timeline. For that reason I wanted the smallest-sized file I could create; hence the codec question.
But here’s the second question. Unlike in Avid, where a single effect can be placed on an upper video track and it changes multiple clips beneath it, I can’t find a way to place a single “widescreen” mask over the entire film so the clips beneath it can be manipulated. Placing it on the clip itself raises and lowers the letterbox as well, and placing it on a slug on V2 masks the center of the image, not the letterbox. This seems like a really basic thing to do, but I can’t make it work. Thanks!