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Here is some info on use of multiple cameras
Selective Stream Editing Selective Stream Editing
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It’s usually seamless and may even go unnoticed to most viewers. Our brain figures things out in less than an instant. Movement, sound, color, motion, expression, fear, happiness and a million other inputs are processed into perspective resulting in our overall emotion. In motion picture production, timing of scene changes, even very subtle changes, are essential in keeping the viewer interested and engaged. The process of using multiple cameras at the same time during a shoot greatly expands potential for expressing overall character of scene. It’s a process that’s been used since the beginning of television. Back in the day the use of multiple cameras was typically done live with the producer calling out which camera to make active at which time. The resulting feed went to a live audience or master tape or both. With the availability of digital editing tools we have today the process of assembling multiple camera angles can be done easily in post production. Times to consider using a multi-cam set up is during fast pace or quickly moving scenes such as sports or racing events. Live music events are ripe for a multiple camera set up (see video at bottom of page). Even static scenes like interviews can benefit, cutting from a wide shot to a close facial shot to enhance an expression or to an off angle shot to shift the overall mood. When preparing for a multi-cam shoot you’ll need to consider where the final audio will reside. You will also need to determine what method to use for synchronizing the video streams to each other and then to the final audio. Time code is a very good method for synchronization but other methods such as use of a combination audio/video cue can work just as well. Here is where the use of a slate will save a lot of time in post-production. The audio snap of a slate along with the visual cue recorded on each camera is an excellent method for synchronizing each shot in post. A sharp hand clap will work just as well. Whatever method you use, make sure it’s captured (both audio & video) on each camera. The start point of each video stream and final audio can be identified with these cues and marked as a synchronize start point. Working with multiple streams of video is processor intensive and requires a very fast hard drive system for playback. The multiple video streams are typically placed on a fast multi- drive or raid system. It’s unlikely that a singe drive will have the read / write capability to play multiple streams of HD video. Once all your camera angles are cued up and synchronized in post production you’ll be able to quickly change camera angles, select the timing between changes and basically make pinpoint edits while viewing in real time. You will quickly realize the use of multi-cam video will greatly expand your creative possibilities.