Re: [LAU] OT - Audio and Video Synch

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To: James Stone <jamesmstone@...>
Cc: A list for linux audio users <Linux-audio-user@...>
Date: Friday, October 18, 2013 - 9:58 pm

On Fri, 18 Oct 2013, James Stone wrote:

> Hi everyone,

I have never done this, so this is the results of my research, not
experience:
If you have the bucks, you can get hardware clock generators which
produce both wordclock (48k seems to be standard for DVDs) and SMTPE
timecode for the video, derived from the same oscillator.
There is also a technique to take the SMTPE timecode, which is a digital
datastream, encode it with a modem into audio tones, and record it to a
separate track on your audio recorder, in parallel with your other audio
tracks.
In the editing suite, this smpte track is demodulated and used to
synchronize the video with the audio.

...All this requires hardware that I can't afford. I record the video and
audio separately, then sync them manually when editing. I've been lucky,
and the drift hasn't been noticable over the max 2-3min scenes I've worked
with.

--
Rick Green

...I live in the hope that one day the fine line of distinction between
genius and insanity will be decided in my favor.

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Messages in current thread:
[LAU] OT - Audio and Video Synch, James Stone, (Fri Oct 18, 9:36 pm)
Re: [LAU] OT - Audio and Video Synch, Len Ovens, (Fri Oct 18, 10:43 pm)
Re: [LAU] OT - Audio and Video Synch, Ralf Mardorf, (Fri Oct 18, 10:58 pm)
Re: [LAU] OT - Audio and Video Synch, Len Ovens, (Fri Oct 18, 11:28 pm)
Re: [LAU] OT - Audio and Video Synch, Simon Wise, (Mon Oct 21, 6:00 am)
Re: [LAU] OT - Audio and Video Synch, Ralf Mardorf, (Fri Oct 18, 11:36 pm)
Re: [LAU] OT - Audio and Video Synch, Ralf Mardorf, (Fri Oct 18, 11:04 pm)
Re: [LAU] OT - Audio and Video Synch, Ralf Mardorf, (Fri Oct 18, 11:13 pm)
Re: [LAU] OT - Audio and Video Synch, Monty Montgomery, (Fri Oct 18, 10:25 pm)
Re: [LAU] OT - Audio and Video Synch, Ralf Mardorf, (Fri Oct 18, 10:42 pm)
Re: [LAU] OT - Audio and Video Synch, James Stone, (Fri Oct 18, 10:30 pm)
Re: [LAU] OT - Audio and Video Synch, Ralf Mardorf, (Fri Oct 18, 10:10 pm)
Re: [LAU] OT - Audio and Video Synch, Rick Green, (Fri Oct 18, 9:58 pm)
Re: [LAU] OT - Audio and Video Synch, Fons Adriaensen, (Fri Oct 18, 9:58 pm)
Re: [LAU] OT - Audio and Video Synch, Paul Davis, (Fri Oct 18, 9:45 pm)