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/archive%40mail-archive.com This email sent to [email protected]
