17 Dec
2004
17 Dec
'04
11:15 p.m.
Hi,
i have written a small MTC generator that sends MTC via alsa_seq. It is
based on the RTC running at a frequency of 8192hz (this introduces
systematic jitter) and currently only sends 30 FPS (nodrop? i think :)
It seems to perform fine on my 2.6.x RP kernel (with the RTC irq at
highest prio above soundcard irq (jackd with ardour running at prio 60)).
Here's the webpage (with tarball):
http://www.affenbande.org/~tapas/wiki/index.php?rtc_mtc_gen
Maybe someone finds it useful. Let me know what you think.
Is there any software other than ardour on which i can try it? I don't
have any hardware here that speaks MTC either..
Flo
--
Palimm Palimm!
http://affenbande.org/~tapas/
17 Dec
17 Dec
11:58 p.m.
New subject: [linux-audio-dev] Re: [linux-audio-user] [ANNOUNCE] rtc based MTC generator
On Sat, 2004-12-18 at 04:31 +0100, Florian Schmidt wrote:
Is there any software other than ardour on which i
can try it? I don't
have any hardware here that speaks MTC either..
My roommate has an Akai MPC, I might be able to test it with that.
Lee
18 Dec
18 Dec
12:08 a.m.
New subject: [linux-audio-dev] Re: [linux-audio-user] [ANNOUNCE] rtc based MTC generator
On Fri, 17 Dec 2004 22:58:15 -0500
Lee Revell <rlrevell(a)joe-job.com> wrote:
On Sat, 2004-12-18 at 04:31 +0100, Florian Schmidt
wrote:
Great. Btw: does anyone know exactly what framerate non drop 30 fps MTC
has? Should i really send with 29.97 fps?
This page (although more on video editing) seems to imply so:
http://www.editorsguild.com/newsletter/Updates96/tipdrop.html
i used this page as reference to the MTC messages:
http://www.borg.com/~jglatt/tech/mtc.htm
Flo
--
Palimm Palimm!
http://affenbande.org/~tapas/
Is there any software other than ardour on which
i can try it? I don't
have any hardware here that speaks MTC either..
My roommate has an Akai MPC, I might be able to test it with that.
Lee
2:09 a.m.
New subject: [linux-audio-dev] Re: [linux-audio-user] [ANNOUNCE] rtc based MTC generator
On Sat, 18 Dec 2004 05:26:32 +0100
Florian Schmidt <mista.tapas(a)gmx.net> wrote:
Great. Btw: does anyone know exactly what framerate
non drop 30 fps MTC
has? Should i really send with 29.97 fps?
I think its actually supposed to be:
30 * 1000 / 10001
Which is actually a repeating fraction.
Erik
--
+-----------------------------------------------------------+
Erik de Castro Lopo nospam(a)mega-nerd.com (Yes it's valid)
+-----------------------------------------------------------+
"The RIAA is obsessed to the point of comedy with the frustration
of having its rules broken, without considering whether such rules
might be standing in the way of increased revenues. Indeed,
Napster and Gnutella may turn out to be the two best music-marketing
gimmicks yet devised, if only the RIAA would take its head out of
its ass long enough to realise it."
-- Thomas C Greene on www.theregister.co.uk
3:09 a.m.
New subject: [linux-audio-dev] Re: [linux-audio-user] [ANNOUNCE] rtc based MTC generator
On lör, 2004-12-18 at 05:26 +0100, Florian Schmidt wrote:
Great. Btw: does anyone know exactly what framerate non drop 30 fps MTC
has? Should i really send with 29.97 fps?
MTC haven't got a 29.97 nondrop. But it would have if you slowed it
down :)
From:
http://www.sfu.ca/sca/Manuals/ZAAPf/t/tcode_rate.html
Frame rates are as follows:
30
Sometimes referred to as black &
white, used in music or sound
applications where no video
reference is required.
29.97
nondrop
Sometimes referred to as colour
code, used in non-broadcast
applications. Standard in countries
with 60 Hz alternating current.
29.97
drop frame
Used in broadcast situations.
Standard in countries with 60 Hz
alternating current.
25
Standard in countries with 50 Hz
alternating current for all
applications.
24
Little used - ostensibly for film
use.
This page (although more on video editing) seems to
imply so:
http://www.editorsguild.com/newsletter/Updates96/tipdrop.html
i used this page as reference to the MTC messages:
http://www.borg.com/~jglatt/tech/mtc.htm
Flo
--
(
)
c[] mvh // Jens M Andreasen
8:21 a.m.
New subject: [linux-audio-dev] Re: [linux-audio-user] [ANNOUNCE] rtc based MTC generator
On Sat, 18 Dec 2004 08:09:54 +0100
Jens M Andreasen <jens.andreasen(a)chello.se> wrote:
On lör, 2004-12-18 at 05:26 +0100, Florian Schmidt
wrote:
Hehe, i did play with it. I changed the average quarterframe frequency
to (29.97*4)hz and ardour started to drift off pretty quickly.
This stuff is still new to me, so i'm sure there's still more than one
or two bugs in my code. But i saw ardour slave actually pretty nicely to
it so i thought "what the heck! release early, release often".
Great. Btw: does anyone know exactly what framerate non drop 30 fps MTC
has? Should i really send with 29.97 fps?
MTC haven't got a 29.97 nondrop. But it would have if you slowed it
down :)
From:
http://www.sfu.ca/sca/Manuals/ZAAPf/t/tcode_rate.html
Frame rates are as follows:
[snip]
Thanks :)
Flo
--
Palimm Palimm!
http://affenbande.org/~tapas/
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5 comments
4 participants
participants (4)
-
Erik de Castro Lopo -
Florian Schmidt -
Jens M Andreasen -
Lee Revell