Re: Audio for Video Shoot

Audio for DV video always runs at a 48kHz sample rate and using other
frame rates instead of the 29.97 fps NTSC frame rate doesn't affect
it. 29.97 fps NTSC Video = 48kHz audio, 25 fps PAL = 48kHz audio, 30p
fps video = 48kHz audio, 24p fps video = 48 kHz audio, etc etc the
frame rates just don't matter. Think of the video frame rate as being
analogus to the frequency of audio tones you're recording. You don't
change the sample rate depending on whether you're recording a 2kHz
tone or a 5kHz tone. Well, in camera the clock is running at 48kHz.
Sending camera sync to the recorder insures it too runs at 48kHz. That
way audio and video don't run at slightly different speeds and drift
out of sync over time due to minor variations in the rates of the two
clocks. But that shouldn't be an issue with most good quality camera
and recorder combinations these days. The frame rate comes into play
when you are using timecode in the recorder, either recording linear
TC with analog and DAT recorders or timestamping BWF files with
file-based recorders - the numbers recorded with the audio need to
match the numbers in the video. But you're not doing that here.

Get a slate at the start of each take and if possible at the end. I
wonder about using a cricket clicker though - remember the editor has
to be able to SEE the exact frame in which the click occurs as well as
see the "click" in the audio waveform in order to line 'em up in post.
If possible, an old fashioned clapstick slate or even having the stage
manager hold his hands up and slap them together (one time only) would
be better options.

HTH

Steve House





On Thu, 29 Jun 2006 19:21:40 -0000, Frank Stearns
<franks.pacifier.com@xxxxxxxxxxxx> wrote:

.....

- I'll mix analog back to 48K, and will initially sample them three mixes
of one of the takes with the bookend clicks: one with the multitrack
clocked at 48K, one clocked at +.1% and one clocked at -.1% (that 29.97
frame thing).

They can tell me which syncs best and then I'll do the rest that way.

Yep, a little CYA on this one. :)

Thanks again,

Frank Stearns
Mobile Audio
.

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