[PD] Mix two video streams and add DSK

[Alexandre Castonguay]

  Hi Jamie,


The only experience I had with 2 simultaneous live feeds was with 
Hauppage PCI cards (analog signal in @ 640 x 480).   Otherwise, DV input 
works in GEM but I only had one available port.  With multiple live 
feeds or heavy video manipulation, you have to expect decreased image 
quality and latency, how much of it depends on your budget. It would be 
cool to benchmark what the best speed/resolution available would be once 
you build it.

Another solution is for the users to realize that there is intrinsic 
value in latency and glitches (both aesthetic and political) and find a 
way to somehow incorporate it in the work.  There is a good text on this 
by one of the recent subscribers to the list.

Cheers,

Alexandre






Le 10-10-03 04:37, Jamie Bullock a écrit :
> Thanks Alexandre and Simon,
>
>
> It sounds like technically the task is a trivial one, thanks for the tips.
>
> In terms of latency, I get the impression this is a function of the video capture method used...
>
> @Simon, can you tell me which PCI card you are using?
>
> This project is to port a piece originally done with Max/Jitter to a Pd-based system. The main complaints they had were video quality and latency, so those are problems we need to solve.
>
> All best,
>
> Jamie
>
> --
> http://www.jamiebullock.com
>
>
>
> On 2 Oct 2010, at 16:13, Alexandre Castonguay wrote:
>
>> Hi Jamie,
>>
>> I think it's easy to do with any of the externals handling video but here is a tutorial :
>>
>> http://en.flossmanuals.net/PureData/GEMVideoMixer
>>
>> I would simply add a [gemhead] ->  [text2d] chain to it.
>>
>> Cheers,
>>
>> Alexandre
>>
>>
>> Le 10-10-02 09:43, Jamie Bullock a écrit :
>>> Hi,
>>>
>>> Does anyone know if it is possible with Pd+externals to mix 2 video streams (with the ability to crossfade between), and add a textual overlay on the mixed image (downstream keying)?
>>>
>>> Is this possible with Gem? Gridflow?
>>>
>>> If this is indeed possible, what sort of latency could I achieve from input to output?
>>>
>>> Platform isn't an issue, I could use Linux, Mac OS or Windows  -- whichever gives the best performance.
>>>
>>> Any advice appreciated.
>>>
>>> Jamie
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>>
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