FCX Multicam

Discussion in 'Digital Video' started by tehybrid, Jan 15, 2007.

  1. tehybrid macrumors member

    Nov 21, 2006
    I read somewhere that Final Cut Express cant work with multicameras. Why is this? Wouldnt you just be able to import multiple cameras and edit it like they are different clips from the same camera?

  2. ChrisA macrumors G4

    Jan 5, 2006
    Redondo Beach, California
    Yes you could do it with iMovie but you'd be limited to doing as you describe. If you are cutting dialog a very common editing technique is a "split cut" or "L-cut". Say you have camera A and B. You might cut the video from A to B but keep audio from A until the other actor speak his line. Not good to cut audio mid sentence but many times we want to show an actor listening (and reacting to) the other actor's line. Same applies to non-actors. Even in a wedding video we like to show close ups of people's faces while the audio comes from the other camera which was recording a person speaking.

    For this kind of work we like to have multiple sync's video and audio tracks on the time line.
  3. simie macrumors 6502a


    Aug 26, 2004
    I found the following multicam advice from here

    I have shot multicam concerts locking up timecode by beaming wireless audio SMPTE timecode to all cameras and recording it on Ch 2, but I can tell you it was a big hassle and a waste of time.

    My recommendation for multi-camera shoots is to either:

    1. Use TOD (Free Run) Timecode

    TOD (Time of Day) timecode is a switchable option on some recent camcorders. With this option, you can synchronize multiple cameras, then each camera can start or stop at will, and the timecode always reflects the current time, not the tape position, so the shot can always be matched to the other cameras.

    The TOD timecode option on the Canon XL2 is shown near the end of the XL2 Feature Tour video on this page:

    Here is a clever article by Chris Hurd on using Free Run Time Code for multicam shoots:

    2. Use Sync Point and Rewrite Timecode in post

    If your camcorders do not have the TOD timecode option, the next best thing is to use a "sync frame".

    Each time the cameras roll, shoot a sync frame, which could be a slate with clapper, someone clapping their hands once, or some other visual or sound cue that you can identify in all camera shots as the same frame. You’ll need to do this again each time you stop, then restart the cameras. It’s best if this sync point is visual and sound, since you can scrub picture to get close, then zero in on the spike in the audio waveform which is far more accurate (48,000 samples per second) than picture (24 - 29.97 frames per second).

    Sometimes the sync frame is natural, like when shooting a live musical event, the beginning of each song could serve as a sync point.

    In this case, it’s important to have wild sound (built-in camera mic) live for all cameras, since you’ll be able to easily fine-tune sync between the different cameras by emilinating the echo on the audio tracks.

    Then, in your editing software, you can match the sync frames and all else should be hunky-dory. In some software, you can actually rewrite auxillary timecode for some clips so the timecode matches the A camera exactly. If you do this, don’t rewrite the primary timecode track, just the auxillary, or else you lose the ability to media manage, batch capture, etc.

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