New subject: line~ for syncing to video

14 Nov 2008

      On Nov 14, 2008, at 7:41 AM, cyrille henry wrote:
...
Hans-Christoph Steiner a écrit :
...
That seems like a lot more work, converting from message to DSP

and back to messages.
work for patching or work for the CPU?
i think both are negligible.
...
Do you think that the timing of [metro] is not accurate enough?
since pd does the timing for both clock, it should work.
but having a master clock at 25Hz, and over-sample it at 44100Hz is

somthing that hurt my sens of logic.
In this case, it was 30fps and 48000Hz, so it is an even multiple.  I

guess it seems odd to me to be using ~ objects for the frame clock,

but I suppose it could be not so weird.  But if this is all in Pd,

then the timing should be coming from the same place either way, right?
.hc
...
cyrille
...
I basically created a [line] that is driven by the frame numbers,

then feed that to [line~] when needed. Seemed to work pretty

well.  See attached patch.
.hc
On Nov 12, 2008, at 5:55 AM, cyrille henry wrote:
...
hello,
you can use frame number as a trigger, that's not incompatible

with a sync from audio to video.
see attachement patch.
cyrille
Hans-Christoph Steiner a écrit :
...
What I am working on are tools for composing audio to someone

else's video.   I've worked on a couple projects like this, I am

in the midst of one know.  Basically, think sound design for a

movie and things like it.  They generate the movie, and so far,

I have found the easiest way to communicate with the people

making the video is to use frame numbers.
Therefore, to compose my sound, I need to frame numbers as a

reference.  Therefore, I need to generate line data from video

frame numbers, unless someone has a better idea.  If the video

guys tell me, "this animation starts on frame 1234 and ends on

1623", then it seems to me that I want to be using frame numbers

as my triggers.
.hc
On Oct 31, 2008, at 11:08 AM, chris clepper wrote:
...
Cyrille points out the correct method of syncing video to an

audio clock.  All hardware devices and professional software

use the audio to clock the video.
On Fri, Oct 31, 2008 at 4:48 AM, cyrille henry

<cyrille.henry@la-kitchen.fr <mailto:cyrille.henry@la- 
kitchen.fr>> wrote:
hello,

i'm wondering why did you sync audio on video : i think it is
easier to sync the video on the audio.
just make all the line~ as you wish for the audio, then  

snapshot~
    periodically and convert audio position to frame number...
cyrille

Hans-Christoph Steiner a écrit :
> I am trying to make a version of [line~] that gives me a  

line based
    > on the frame numbers I give it.  Basically, I give it a

frame
    counter
    > in the first inlet, then start frame and stop frame as

arguments.
    > The hard part is that I want it to behave like [line] in

that the
    > last value stays in effect until something else overrides

it.
    >
    > How do I do that with DSP data?  If I use [switch~], then

the
    > [outlet~] will just retain its last value.
    >
    > .hc
    >
    >
    >

> ----
>
> 'You people have such restrictive dress for women,' she  

said,
    > hobbling away in three inch heels and panty hose to

finish out
    > another pink-collar temp pool day.  - "Hijab Scene #2",

by Mohja
    Kahf
    >
    >
    >
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If you are not part of the solution, you are part of the problem.
#N canvas 64 128 625 478 10;
#X obj 79 193 line~;
#X floatatom 79 25 5 0 0 0 - - -;
#X text 130 25 frame number;
#X obj 79 45 / 25;
#X text 135 45 time in s;
#X obj 79 73 * 1000;
#X text 143 73 time in ms;
#X obj 79 97 t f f;
#X obj 79 146 pack f f;
#X obj 111 119 + 100000;
#X msg 79 169 $1 , $2 100000;
#X text 186 169 go to 100 0 ms latter , in 100 000ms;
#X text 126 194 master time for everything (in ms since beggining of
files);
#X obj 215 236 *~ 44.1;
#X text 280 237 position in the audio file;
#X obj 79 314 snapshot~;
#X obj 100 288 metro 1;
#X obj 100 265 loadbang;
#X text 170 289 1ms precision for video is ok;
#X obj 79 340 / 40;
#X text 125 343 time of each frame;
#X obj 79 363 i;
#X obj 79 384 change;
#X text 146 386 frame number;
#X floatatom 92 409 5 0 0 0 - - -;
#X connect 0 0 13 0;
#X connect 0 0 15 0;
#X connect 1 0 3 0;
#X connect 3 0 5 0;
#X connect 5 0 7 0;
#X connect 7 0 8 0;
#X connect 7 1 9 0;
#X connect 8 0 10 0;
#X connect 9 0 8 1;
#X connect 10 0 0 0;
#X connect 15 0 19 0;
#X connect 16 0 15 0;
#X connect 17 0 16 0;
#X connect 19 0 21 0;
#X connect 21 0 22 0;
#X connect 22 0 24 0;

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Re: [PD] line~ for syncing to video