Forums > Jitter

capture from FireWire DV like in iMovie or FinalCut

June 21, 2006 | 10:28 am

Hi!

I?m working on a video project and I try to capture from a FireWire Cam in PAL resolution with jit.qt.grab and jit.qt.record.
With this solution I always have performance problems on a G5 1,8 ghz.
I can?t capture at the full framerate of 25fps.
Capturing video in iMovie or FinalCut works also on a slow G3 very fine.

Do you have some advice for me to do some "iMovie-like" capturing in max?

cheers flo



ken
June 22, 2006 | 1:55 am

Try this. I believe that getvmode should see your camera as PAL. I
also set the frame size to PAL manually so that it is full frame, not
half frame.
Ken
ken@kennethfeinstein.com
http://www.kennethfeinstein.com

max v2;
#N vpatcher 582 418 1182 818;
#P window setfont "Sans Serif" 9.;
#P window linecount 1;
#P newex 76 65 52 196617 metro 50;
#P toggle 76 33 15 0;
#P newex 91 164 98 196617 jit.qt.grab 768 576;
#P number 243 76 35 9 0 2 3 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P number 179 76 35 9 0 0 1 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P message 243 102 52 196617 vmode $1;
#P message 243 140 51 196617 getvmode;
#P message 179 102 58 196617 vdevice $1;
#P message 179 140 55 196617 getvdevice;
#P number 129 76 35 9 0 0 1 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P message 129 140 44 196617 getinput;
#P message 129 102 45 196617 input $1;
#P connect 10 0 11 0;
#P hidden connect 2 0 0 0;
#P hidden connect 7 0 4 0;
#P hidden connect 8 0 6 0;
#P pop;

On Jun 21, 2006, at 6:28 PM, flo spier wrote:

>
> Hi!
>
> I?m working on a video project and I try to capture from a FireWire
> Cam in PAL resolution with jit.qt.grab and jit.qt.record.
> With this solution I always have performance problems on a G5 1,8 ghz.
> I can?t capture at the full framerate of 25fps.
> Capturing video in iMovie or FinalCut works also on a slow G3 very
> fine.
>
> Do you have some advice for me to do some "iMovie-like" capturing
> in max?
>
> cheers flo


June 22, 2006 | 3:23 pm

cheers good help!

in addition I discovered that the jit.qt.grab object accepts also a write message and writes the video directly to disc.
so I eleminated my performance problems cause I don?t send the video through a jitter matrix anymore…

greetz

flo


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