One of the questions I'm asked most frequently about Final Cut is, "When do I use Apple's ProRes 422 codec?" To tackle this question it's first necessary to understand a few things about codecs. Shooting video is a very intensive digital capture process. It requires cameras to capture lots of information in a short amount of time. To handle so much raw data, most cameras need to compress what they capture. A codec is essentially a compression scheme, a way to encapsulate so much material into a containable format. Standard DV footage, for instance, uses a compression scheme referred to as the DV codec. Similarly, HD footage -- 1080i60, 1080p, etc. -- uses the HDV codec. Codec takes its name from “encoder” and “decoder” since your computer must now decode the encoded file during playback. When you create a new sequence in Final Cut, you are building what will become a new…