[PD] avoiding flicker with pix_video+pix_movement

[Jaime Oliver]

is it possible your camera is capturing at 29.996 fps instead of 30 and
pix_video still is capturing them as 30 or something similar?
is it a dv compressed camera?
could you measure the frequency of the black/white frames?

J

On Mon, Mar 22, 2010 at 1:54 AM, IOhannes m zmoelnig <zmoelnig at iem.at>wrote:

> On 2010-03-22 09:48, Matteo Sisti Sette wrote:
> > IOHannes wrote:
> >
> > I tried [print]ing the output from the 7th outlet, whose function is not
> > quite clear in the help patch: "list <newimage> <newfilm>". I guessed
> > either <newimage> or <newfilm> _may_ be a boolean meaning whether the
> > image is new (or the film, whatever it is), but even if I set the gemwin
> > at 30 or 50 fps, I _always_ get "1 0", and I don't think my webcam
> > captures 50 fps.......
> >
>
>
> that would have been the hint
>
> there are two possibilities why this is happening:
> - there is a bug in Gem that doesn't mark the images as "old" (was this
> on w32 or osx?)
> - there is a "bug" in the image acquisition backend (DirectShow,
> QuickTime,...) that just serves the same image twice as if it were new.
>
>
> in the former case, we can fix it.
> in the latter case we won't.
>
> of course you can use the "black" image to detect whether the same image
> was captured twice.
>
> fgasdr
> IOhannes
>
>
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-- 
Jaime E Oliver LR

joliverl at ucsd.edu
www.realidadvisual.org/jaimeoliver
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