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DSLR FRIDAY: Clap Sync!

Oh snap!

A few weeks back I announced the start of a new, reoccurring feature here on Video Contest News; DSLR FRIDAY.  Since a huge percentage of video contest filmmakers are now shooting their entries with DSLRs I figured our readers might be interested in hearing the occasional DSLR tip.  So does this mean you can expect to see a fresh camera tip here every friday?  Heh…no.  I just announced the feature and already it’s been a few weeks since the first installment.  So think of DSLR Friday as being like a haunted pirate ship that sometimes appears in the harbor when there’s a full moon.  You’ll never know when you can expect to see DSLR FRIDAY but I swear by Poseidon’s beard your best chance of catching a glimpse of it will be on a friday.  Or…a few days after since my posts just get pushed down the page whenever a new one is added.

Today’s tip is going to be simple but sweet. If you shoot with a DSLR then you know that getting good audio with one of those cameras is a bitch and a half.  My Canon T2i (like all DSLRs) has a built in auto-gain function that is famously terrible. Even if you plug an external mic into the camera, the auto-gain is really gonna cramp your style. So if you want good audio you can either hack your DSLR and turn off the auto-gain (we’ll save that for a future post) or you can record audio to an external device.

Zooma, zoom zoom

From my family’s VHS camcorder to to my Mini-DV DVX-100B, every video camera I’ve ever used was able to record acceptable audio. So recording audio and video separately was a totally foreign exercise to me. Like a lot of DSLR users I bought a audio recorder. The thing cost me about 300 bucks and does a pretty nice job.  But using an external audio recorder will leave you with a new problem.  How do you sync up the audio and the video?

I’ve asked a few filmmaker friends about this and some of them say they use software to sync up their clips.  This program called PluralEyes seems to be pretty popular but it costs a $150.  And it only works in Final Cut Pro so if you use imovie or Final Cut Express you’re out of luck.  Plus it just seems like kind of an unnecessary hassle to me.  When I sit down to edit I want to get into it as quickly as possible.  If I’m doing a simple project I don’t want to wait for 60 minutes of audio and video to sync up before I can get to work.

So I sync up my clips the old fashioned way; with a clapper!  You know…one of those clapboard things you always see in movies about movies?  Actual “Filmmakers” have been recording sound and picture separately since the birth of the talkies.  And the way they’ve always synced the two up in post is with a clap sync.  In film they used to have to match the “clap” on the audio track to the visual clap on the screen.  But since your DSLR actually records sound you’ll have it a lot easier then those old-timers did.

Last fall I bought myself and even though the board part fell off the first time I used it, I totally love it.  I actually like it much better without the board since I can can keep the “sticks” in my pocket.  Just using the sticks also helps you keep a lower profile if you’re doing some guerrilla-style filming on the street.  If cops or security guard see a professional-looking clapboard they may be more inclined to ask you what the hell you’re doing.

So here’s how you use your sticks; when you’re on set, after the camera starts rolling you just need to do something that will feel incredibly cliche.  You need to stick the clapper in front of the actors and give it a snap.  You can even yell “Take two” or whatever if that will help you keep track of the clips later.  But if you’re using a ZOOM recorder it will tell you what track you are recording.  So I’ve found that saying the audio track number is INCREDIBLY helpful in post.

Once you start editing you open up the video clip you want to use and right at the start of it you’ll hear yourself announcing which audio clip goes with it.  Once you open that clip up you’ll see a huge audio spike.  That’s your clapper.  And if you look at the audio on the video clip, you’ll see the exact same spike.

If you’re a decent editor I don’t really need to tell you what to do next.  (But I will anyway)  Inch along the track until you get to the spike and you hear the first hint of the “Clack” sound.  Mark that spot as the start of your clip.  Then go to the video clip and do the same thing.  Place the video on the timeline and then stick the audio clip right underneath it.  The audio on both should line up perfectly.  Since I figured out that you should make your first cut one frame after you hear the start of the clap, my clips have been syncing up perfectly 100% of the time.

Of course, you could also cheap out and just clap your hands at the start of each take.  But the sound of a hand clap just isn’t as clean and perfect as the sound of a clapboard.  Also people who do that look like assholes who are to cheap to buy pair of fucking sticks.  So yeah, don’t be that guy.

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6 Responses to “DSLR FRIDAY: Clap Sync!”

  1. says:

    Hey Beardy,

    Cool blog! Just so you know, Plual Eyes is indeed available for the PC Premeire Pro and Vegas Pro editing systems. If you scroll down the link you provided you can even download and try them out with those platforms;)

    Peace!

  2. Beardy says:

    Danny, thanks for the info. I’ll correct that point in the post.

  3. david rorie says:

    what a pain in the ass.
    lets not go backwards with technology! whatsnext sproket holes!
    you can buy a little external device with a volume knob on it.
    much easier!

  4. Beardy says:

    David,

    I’m not familiar with the kind of device you’re talking about. Do you have a link?

    It sounds like the device you described could adjust the volume of the audio going into a DSLR. But that still leaves you with the auto-gain controls in the camera. (Unless you have a sound guy riding the levels) Even with the device, a whisper would still be made louder by the camera which would also increase background noise.

  5. david rorie says:

    yea, you may be right.
    but i refuse to pick up a clapboard again! it seems archaic!!

  6. Barry says:

    last weekend I used a DSLR and Zoom H4N and Clapboard for the first time shooting footage for a contest. When I got into FCP I synced it up exactly as you said. But I was under the gun since this was a 24 hour film race. What I did not do or expect was that once I linked the video with the Zoom Audio, it did not save or create a “new” clip. So every time I need more material from that particular shot I had to go back and resync the video and audio. Brutal!


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