As a matter of fact, I made something not that long ago for just this scenario.
I am attaching the "beat engine" that I used to synchronize this: http://vimeo.com/15191953 I'm using "square waves" so that a hard tick is generated on the counter, but you can change wave types to generate the other kinds of envelopes that should be familiar from synthesis via the LFO. On Fri, Oct 1, 2010 at 4:50 PM, Rua Haszard Morris <[email protected]> wrote: > Hi list, > > I've been trying to animate in time with music by using LFOs running at bpm > related rates. The bpms tend to be 128/130ish so are not nicely related to > frame > rates (e.g. 120bpm would be!). > > I can't seem to get accurate sync between my audio (which is at a known > tempo) > and the LFOs - the LFOs seem to drift. I think this is the accumulation of > rounding error over the course of the animation. > > I wrote a BPM-LFO plugin so as to avoid rounding issues, supplying tempo in > BPM > instead of period, and this LFO seems to drift just as much. > > Has anyone used LFOs for roughly bpm-accurate synched animation over the > course > of about 5 minutes? If anyone's succeeded I'd love to know how to do it! > > BTW my needs are reasonably modest - things like an image that flashes > every > second beat over the course of a whole song - e.g. 64 times a minute, or a > billboard that slides into view every 16 bars (64 beats) - but the LFOs > need to > ensure these elements stay in phase with the audio beat. > > thanks > Rua HM. > -- > http://cartoonbeats.com > http://haszaristwocents.blogspot.com > http://myspace.com/haszari > http://last.fm/music/Haszari > > > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Quartzcomposer-dev mailing list ([email protected]) > Help/Unsubscribe/Update your Subscription: > > http://lists.apple.com/mailman/options/quartzcomposer-dev/gtoledo3%40gmail.com > > This email sent to [email protected] > -- George Toledo [email protected] www.georgetoledo.com The information contained in this E-mail and any attachments may be confidential. If you have received this E-mail in error, please notify us immediately by telephone or return E-mail. You should not use or disclose the contents of this E-mail or any of the attachments for any purpose or to any persons.
Beat Engine_GT.qtz
Description: Binary data
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