[LAD] interesting blog post about syncing blender and ardour

Florian Faber faber at faberman.de
Sat Sep 26 04:28:12 UTC 2009


> Not really. Suppose you have to do this:
> 1. copy an audio track from a video recording,
> 2. do some work on it, 
> 3. copy the result back to the video recording.
> Your (nominal) sample rate is 48k, the video is
> exactly 100s long when played at the exact frame
> rate.
> If the the clock used by the video equipment and your
> sample clock are not coherent (not derived from the
> same source), there will be a relative error between
> them, both in steps 1 and 3. 

If the source is analogue video (and analogue audio), you derive your
word clock from the VBI/video lines or SMPTE, if you have this information.

If the source is digital, well, there is no problem, since you work on a
fixed number of samples.

So please tell me how this can ever happen in real life?

Machines can do the work, so people have time to think.
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