Drift in FCP - shot Canon 5D & 7D 24fps w/H4N

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Re: Drift in FCP - shot Canon 5D & 7D 24fps w/H4N

Postby jesse on Mon May 09, 2011 2:43 pm

HenrikDK,

Though I don't have time to make more screengrabs today, I'd like to add an alternate method to try since it sounds urgent- this is what I recently used on a project where the audio was recorded at 30FPS and was supposed to sync with 24FPS footage (theoretically, this should work to sync any audio to any video that doesn't match perfectly to begin with):

    On a timeline, sync up your audio to your video at the beginning of the clip (choose the longest clip you can). Make the audio and video start at the same time (trim the heads of each clip).

    Go to the end and find the latest sync point at the tail of the video and the audio. Trim the excess for both audio and video out. Now you should have two clips that don't sync, but have the in and out points synced.

    Next, use the speed tool (sss on the keyboard, or look in the slip/slide tool tray). Use the speed tool to drag the outpoint for your audio to snap to the out point for your video. This changes the speed of your audio clip (in my case it ended up being about 100.10% - you can see this by hitting command-J). By locking in the two sync points at the head and tail, then adjusting the speed of the clip so both points sync at the start and end of the clip, you've got a good chance that you will now have sync.

    Copy the newly-synced audio clip.

    Then, throw all your audio files onto a new timeline, select all the clips on the timeline, and hit option-V. This will bring up the paste attributes dialogue, and in there you choose "audio speed". That changes all your audio to the slightly sped-up rate that you just copied from the fixed clip.

    Select all the audio files on the timeline and throw them into their own new bin in the browser. From there, select all the new clips in the bin and do a batch export.

    Bring the newly-exported files back into FCP.

    The new audio files should sync up perfectly with Pluraleyes or manually.

At least this worked for me. Please let us know if any of this fixed your problem.
-Jesse
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Re: Drift in FCP - shot Canon 5D & 7D 24fps w/H4N

Postby HenrikDK on Tue May 10, 2011 6:45 am

Heya

thanks so much for your help, Jesse. For some reason the first method didn't work for me, although I tried all sorts of variables.
In the end I tried opening up a new project and messed around with the sequence settings, for some reason it worked right off the bat. I say 'for some reason' since I matched all the sequence settings to the previous project afterwards, and they are - as far as I can tell - identical.
The only thing more frustrating, than not knowing what you did wrong, is not knowing what you did right... :?

So I ended up just re-logging everything...before even seeing or trying your second method(but I will keep it handy for next time!)

Thanks again

Henrik
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Re: Drift in FCP - shot Canon 5D & 7D 24fps w/H4N

Postby ghug on Thu Dec 15, 2011 10:34 am

Hi there -

I just shot a series of interviews for a client on Canon 7d, PAL 25fps, and recorded audio on Tascam DR-40. Audio drift is very noticeable on every shot particularly the longer ones. Have tried conforming footage to 23.98, batch exporting audio with 25fps, everything and it still drifts. I've used PluralEyes, been in touch with Bruce there, now using DualEyes.. Nothing works as of yet.

Please help!!! Jesse? Anyone?

Thank you!
Geoff
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Re: Drift in FCP - shot Canon 5D & 7D 24fps w/H4N

Postby jesse on Thu Dec 15, 2011 12:23 pm

HI Geoff,

What I would suggest is the brute-force method:

•Take your first long clip, put it on a timeline.
•Find a starting sync point, trim everything before that so the clip starts with your sync point
•Find an ending sync point, and trim everything after that - should be as close to the end as possible
•Do this same process with the corresponding audio so that your sync points are the same in the audio at the start and end of each clip - the picture should be noticeably longer or shorter than your audio clip representing the audio drift
•Line up the first sync point on picture and audio
•Select the time-stretch tool (hidden in the slip tool section, you can reach it by hitting S 3 times)
•Use the time-stretch tool to drag the end of the audio clip to the end of the picture clip

Now you should have your audio synced without too much fuss. You'd have to do this manually for each clip, but it should get the job done where other methods have failed.

Best of luck!
-Jesse
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Re: Drift in FCP - shot Canon 5D & 7D 24fps w/H4N

Postby ghug on Thu Dec 15, 2011 2:17 pm

Brute-force but totally works! Thanks so much!
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Re: Drift in FCP - shot Canon 5D & 7D 24fps w/H4N

Postby admin on Thu Dec 15, 2011 3:45 pm

ghug wrote:Brute-force but totally works! Thanks so much!

I do hope you've tried the techniques described in this blog post though. We've never seen it fail when applied precisely and it is much easier than the brute force method.

Bruce
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Re: Drift in FCP - shot Canon 5D & 7D 24fps w/H4N

Postby JPW on Tue May 22, 2012 12:27 am

Hi Jesse,

I cannot see your screen shots of how you resolved this issue. Please could you re-post? I have the same issue with 48HZ audio from the Zoom and syncing with 23.98 5D Mark 2 footage.

Thanks very much!

Jeanette
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Re: Drift in FCP - shot Canon 5D & 7D 24fps w/H4N

Postby Thibaut Darscotte on Thu May 31, 2012 12:54 pm

Hey,

I once had to mix a music video where a H4N was used. I had to line it up with the camera.
Big surprise : the camera was running a stable 25frames/second, but the H4N was running faster...
It actually records 48.048 kHz or something like that (and not 48 kHz as it should be supposed to).
I had then to time strech, realign and sometimes cut to make it sync with the video.
Well, the only thing I wanted to say is : pay attention to these low cost hand recorders. The speed is not often really accurate.
Thibaut Darscotte
 
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Re: Drift in FCP - shot Canon 5D & 7D 24fps w/H4N

Postby admin on Thu May 31, 2012 2:10 pm

Actually the H4n is very accurate in its timing. The 48.048 kHz rate you mention differs from the standard 48 kHz by the NTSC frame rate factor of 1001/1000. I am assuming that you were using Final Cut Pro 6 or 7, and if so, what you saw was almost certainly caused by the FCP settings. They take some care to get just right. The cause and the solution are explained here.

Bruce
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