I think I've cracked it - the error accumulates in my renderer, because at 30fps the frame duration is 0.033333333 reccuring, and QTTime truncs that to 0.03333.
An "easy" frame rate of 25 is much more in sync. So I should add a feature request to QtzRendang to keep track of the error in the frame rate, and add empty frames every now and then to make up the difference. thanks again for the help :) H -- http://cartoonbeats.com http://haszaristwocents.blogspot.com http://myspace.com/haszari http://last.fm/music/Haszari ________________________________ From: George Toledo <[email protected]> To: Rua Haszard Morris <[email protected]> Cc: [email protected] Sent: Sat, 2 October, 2010 12:16:28 PM Subject: Re: bpm-accurate LFO for quartz composer? I render with Kineme's Quartz Crystal, which is particularly excellent: http://kineme.net/product/QuartzCrystal Then I open both my audio file and my movie file with QuicktimePlayer/Quicktime Pro (still running the older Quicktime app with the Pro extensions in addition to the default Quicktime X). I "select all" on my audio file, and "copy". The I bring focus on the movie file, and choose "add to movie". Then I export to whatever file type I want. That's pretty much it, since I usually program fades, titling, etc. with QC. If I need to do anything more complex I use Final Cut, but that's kind of overkill for adding audio to a movie file. -GT On Fri, Oct 1, 2010 at 7:02 PM, Rua Haszard Morris <[email protected]> wrote: Aha - Indeed this is very accurate! (Nice animation by the way) > > >I tried this on one of my tunes using playback in quartz composer, and it >stuck >nicely to the kick. > > >However it drifted when I used my rendering app (qtzrendang.googlecode.com), >so >it's likely a timing bug in that or some other interaction. > > >What do you use to render your compositions & attach the audio? > > >thanks for the help >H > -- >http://cartoonbeats.com >http://haszaristwocents.blogspot.com >http://myspace.com/haszari >http://last.fm/music/Haszari > > > > > ________________________________ From: George Toledo <[email protected]> >To: Rua Haszard Morris <[email protected]> >Cc: [email protected] >Sent: Sat, 2 October, 2010 10:40:41 AM >Subject: Re: bpm-accurate LFO for quartz composer? > > >Err, sorry for the string of responses, it's just that I re-read your note >about >every second beat. If you take the instance where I have a half note beat, >and >offset phase by 180, then you will have it hit on the 2 and the 4 (eg., >typical >snare hit), instead of the 1 and 3. Using phase will control your offsets, and >"groove" (eg., slightly ahead or behind beat). > > >Also, I've capped the whole note at sequences of 4, but you could leave it >unranged, so that it becomes a measure count. If you change a chain to >generate >8th notes or 16th notes (or 3/4 time), you can adjust the associated range >patches accordingly, so that they actually keep track of that count. Just >throwing out some related thoughts that will hopefully help you in your quest >for tight synchronization. > > >-GT > > >On Fri, Oct 1, 2010 at 5:32 PM, George Toledo <[email protected]> wrote: > >BTW, please let me know if you do experience any drift in using this, as there >isn't any reason that I'm aware of that would cause it with this. I've run it >for a couple hours alongside a drum machine and had it keep lock. >> >> >>-GT >> >> >> >>On Fri, Oct 1, 2010 at 5:26 PM, George Toledo <[email protected]> wrote: >> >>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. >>> >> >> >>-- >> >>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. >> > > >-- > >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. > > -- 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.
_______________________________________________ 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]
