I have 2 canon EOS 7d Mark II cameras. I want to do a multi-camera shoot and have one camera film the action and have the 2nd camera filming the 1st camera and the set for a "how we did it" video. How do I keep the 2 cameras in sync for sound? I figure I need to use timecode, but have never done it...
Follow-up question: I used Adobe premiere to edit in.... What do I need to do in Premiere to line up the 2 clips and is any "correction" needed for "audio drift"?
Time code cannot be inputted from a timecode generator or similar device. Your best solution may be to use a time code display slate at the beginning of each clip on each camera for reference. At least you would have a single time reference if the slate display was running in free run and never stopped or paused.
The GPS clock is a really smart idea. It definitely gets you within a few frames, you just have to fine-tune it.
Based on your project description, I would suggest using Pluraleyes to sync your clips. Try the free trial to see if it works for you.
First, I'm shooting stills, not video, so I don't know if this will work as well for you. But I sync my cameras shortly before any multi-camera shoot so that the stills will be in exact order taken when I go to edit them.
What I do is attach the camera to one of my computers (desktop of laptop) with the mini-USB cable. Then start EOS Utilities (might start automatically, depending upon your setup). Now click on the little tab with the "wrench" icon, then click on the date/time section that appears. This opens a dialogue box that has a button to set the time to match the computer's clock exactly.
Do this with each camera and they are all exactly in sync.
The cameras do drift out of sync rather quickly. I guess their internal clocks aren't all that precise from one camera to the next. For my purposes shooting stills, I would usually re-sync them after a few days, maybe a week at most. For your purposes shooting video that has to exaclty match you might need to do it shortly before each shoot.
It probably also can be done through GPS or remotely if using a WFT module, but I don't use those currently.