What are the underlying number precessions (types) used in QC?
I noticed a similar problem in a chain of interpolation patch set to
external time mapping several curves into each other. They were
starting an ending counts of 100,000+ but had to start and end really
slow, as in 1,2,3… There was a kind of 'click' at the end which I put
down to the rounding getting mapped to a much bigger value.
(Maths expression that evaluates like 2 exp-in and 2 exp-out
interpolates in a chain, anybody?)
I've only noticed the lower precision on patch time values (& stop
watch etc) so far.
The machine does not isolate man from the great problems of nature but
plunges him more deeply into them.
Antoine de Saint-Exupery
On 02/10/2010, at 10:19 AM, Rua Haszard Morris wrote:
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/qc.student.au%40gmail.com
This email sent to [email protected]
_______________________________________________
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]
