[PD] Dual Head Synchronized Video Files controlled by Serial port - which elements?
vade
doktorp at mac.com
Mon Jan 9 05:08:25 CET 2006
this should get you started with GEM in PD.

Im just making 2 separate rects to draw on. they arent really 'in
synch', but you can turn auto 1 off and control frame by frame
assuming they are the same length.
v a d e //
www.vade.info
abstrakt.vade.info
On Jan 8, 2006, at 6:06 PM, lists.puredata.info at cefn.com wrote:
> I'd like to control two separate projectors playing separate pre-
> recorded video in synchrony (dual head). Don't know which elements
> are best to achieve this. Interested to know the components which I
> should use as there are a few choices.
>
> I've prototyped some simple video control in GEM, on an OpenGL 3D
> surface as described at http://www.agnula.org/documentation/
> dp_tutorials/pd_gem/ and the rendering and control of frame speed
> is perfect. However for the real thing I'll need dual head
> rendering of two video files, and presumably rendering the frame
> sequence to an OpenGL pixmap on a texture mapped surface is
> unnecessary and itself could create some limitations for dual-heading.
>
>
> THE ALTERNATIVES
>
> The basic questions are...
>
> Video rendering : Gridflow vs. GEM vs. X.
> Serial comms : comport vs. serialctl vs. X.
>
> Both dual head rendering and cross-platform serial communications
> seem to be contentious issues, so I think it might be useful to
> have ideas from those with experience of either or both of these
> issues, and can recommend the libraries most likely to work for
> both my prototyping and deployment environment. I hope to work out
> the details myself, once I have an idea which libraries should work
> in principle.
>
> Also if anyone has suggestions as to the strategy I should use to
> get serial control data in from a Basic Stamp microprocessor, and
> map two output video streams to two screens simultaneously, this
> would be very useful.
>
>
> THE PROJECT
>
> I want to emulate the front and rear window of a car, (footage
> recorded from two DV cameras in a real car), on opposing projection
> screens. The reason I'm keen on using PD is because I need to
> control the speed of the video in real time as if controlling the
> speed of the car's accelerator, from zero mph to full video speed
> and above. Tried this with processing and it was very glitchy.
>
> I'm prototyping on Mac OS X but will deploy probably on an intel
> machine running debian.
>
> Welcome your contributions.
>
> Cefn
> http://cefn.com/curiosity/
>
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