Problem with Audio (RED Music Video)

[Tom Taugher]

Hello all,

Quick question, shot a music video this past weekend on the Scarlet.
I recorded audio using the x 2 channel adapter and a plugged in RODE VIDEOMIC PRO.

Now here's the kick,
I have brought all the footage into Premiere Pro, lined up the footage with the artists song used during playback
and as the play head on the timeline progresses, the audio becomes off sync.. Not sure what is going on.
If anyone can offer any assistance that would be great and much appreciated.

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Tom Taugher

[Marc Wielage]

What speed was the sound played back on the set? If it wasn't played back with a known timecode source and reference, then it could well be off-speed. Many, many sound sources (iPods, etc.) are very slipshod when it comes to speed accuracy.

My advice is two-fold:

1) next time, hire a pro to do the sound playback (preferably with timecode slates and reliable playback)

2) this time, find a varispeed rate for sound that will keep it in sync for the piece. If the editor has to cut every so often anyway, and you're not holding on any one shot for more than 10 seconds, it'll be more than enough to get by.

[Joseph Coleman]

sounds like it could be a couple things. First check to make sure that your sequence settings in Premiere match the footage. Second view your metadata and make sure your Project timebase on the scarlet is matching what you shot. if you shot 24fps with a 30 fps timebase then that would account for your audio not matching but be subtle enough to miss...Also, (least likely) some artist record the same track with faster/slower beats for live performances, so I would double check that you are in fact using the exact same audio that you used during recording.

Just curious, how off is it? is it immediately noticeable or does it have to go a minute or two in to a clip before its noticeable? If its very very slight then make sure your sequence settings are not 23.976 and you recorded in 24.

Joe

[Marc Wielage]

If it's drifting 3 frames a minute, then there would be a .1% pulldown problem (24.00fps vs. 23.98fps). More than that, it could be a lot of different things.

Playing back accurately and repeatably on set is not as easy or simple as you might think, especially in a music video situation.

[Nick Mahar]

check the audio recorded on the red itself. I shot one a few weeks ago and the audio started skipping on the raw files

[Les C.]

always record the clapper at the start and end, at least for a few shots, as it makes it easier to see if there's a problem and how much of one.

[Tom Taugher]

Thanks everyone,
Yeah I'm gonna play around with the Project Timebase, around 1min 30 it seems to vary between several frames..
So my guess would be to lean towards a variance in 24 vs 23.98.
Will keep you guys updated, appreciate all the help!

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Tom Taugher

[Steinar Andersen]

I've had this problem before....If the song you played back on set had a sample rate of 44100 khz and the camera record audio at 48000khz, then the camera will effectively resample the song to 48000khz. If you then try to line it up with the original file at 44100khz, the audio will be off quite a bit. Solution: resample the song/original file at 48000khz and to match the sample rate of the camera recorded sound.