dimension x divided by deimension y gives you the aspect ratio. see attached 
patch:

Attachment: autoscale_ratio_image_or_video.pd
Description: Binary data


m.



Am 21.07.2010 um 21:51 schrieb J bz:

> Hi Max,
> 
> Cheers for the quick response.
> 
> tbh, pix_film is the reason I know the pixel dimensions already:)
> 
> Would you mind explaining in a little more detail - which objects and how?
> 
> I am unclear on the relationship, say, between [rectangle 3 2] and 320x240 
> pixels, and again how that corresponds to [translate] and the numbers I am 
> putting in the inlets 2 and 3 of translate.  For example when I increase the 
> 2nd inlet of translate (magnification? sorry I'm not in front of pd atm) my 
> 2nd avi movie moves in a north easterly direction from within the gemwin and 
> I don't understand why?
> 
> Kind regards,
> 
> Jb
> 
> On 21 July 2010 18:37, Max <abonneme...@revolwear.com> wrote:
> pix_film does output the dimensions of the movie in pixels when a movie is 
> loaded. Assuming that the movie is in square pixels (which is the case if you 
> are using screenshots and webcam movies) this allows you with a couple of 
> objects to automatically scale the rectangle it is textured to to fit the 
> right aspect ratio.
> 
> m.
> 
> Am 21.07.2010 um 19:25 schrieb J bz:
> 
> > Hey again,
> >
> > So,
> >
> > I have my 3 avi's with 3 seperate [gemheads] which I can now move around 
> > the [gemwin].  Cool.
> >
> > Could someone enlighten me towards the relationships between [translate] 
> > and [rectangle] please?
> >
> > I would like to keep the original aspect ratios for the 3 avi's.  Avi 1 is 
> > an odd shape  - w432 h768 - (it's approximately half of my laptop desktop 
> > recorded with RecordMyDesktop) and avi 2&3 are recorded off bog-standard 
> > camera's, so are 320x240. The larger file is on the left of my gemwindow 
> > with the 2 other avi's to the right, one above the other.  I have added the 
> > widths of film 1 and film 2 with little borders which gives [dimen 762 
> > 768(.  I can move the files around and get an approximate fit moving 
> > between each [translate] and [rectangle] but I get the feeling there is a 
> > more rigorous approach.
> >
> > Apologies in advance if I have missed something in the helpfiles or various 
> > tutorials but I can't seem to find the info I'm looking for.
> >
> > Best wishes,
> >
> > Julian
> > _______________________________________________
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> > http://lists.puredata.info/listinfo/pd-list
> 
> 

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