[PD] Re: Soft Rock EP

[Paris Treantafeles]

Hi Claude,

Thanks for the background info.

The Maciunas film is great but I think your work is sufficiently  
different :-)

The idea of creating a customizable DVD is very cool. I can imagine  
allowing users to control parameters in audio/video, etc. and create  
something fun.

As for the steps that you took - I wonder if you could please explain  
saving the ppm files in Gridflow.
I have looked at
http://gridflow.ca/latest/doc/format.html
and just couldn't figure it out.
I was trying to do something similar with jpegs and
sending messages like:

[open jpeg testfile(

and

[format jpeg(

to an

[#out]

object but had no luck.
I'm sure I'm just being stupid but any help would be appreciated!

I know that saving the files will slow things down considerably but  
would still like to know how it's done :-)

Thank and best,
p


On Aug 23, 2006, at 3:51 PM, Claude Heiland-Allen wrote:

> Paris Treantafeles wrote:
>> Hi Claude,
>> I finally have downloaded and watched your Soft Rock EP and wow...  
>> great stuff!
>> I may be biased because it's quite similar to some of my own work  
>> - even without the GridFlow abstraction that you shared :-)
>
> Thanks - a friend of mine showed me a video made 40 years ago that  
> looks similar in places:
>
> George Maciunas - Artype (1966), 29 mb
> http://ubu.wfmu.org/video/fluxfilm_20_maciunas.mpg
> http://www.ubu.com/film/fluxfilm.html
>
> I'll have to try harder to come up with something original!
>
>> If you don't mind can you tell us how you captured the visuals?
>> They look very good - were you writing to disk (say from Gridflow  
>> to Gem?) or sending video out to another machine to capture.
>
> I saved lossless ppm images direct from GridFlow.  To avoid using  
> an excessive amount of disk space, I used a named pipe created with  
> mkfifo to send these images directly to mpeg2enc (part of  
> mjpegtools package, I believe).
>
> Needless to say it works slower than realtime, I think it rendered  
> at about 4 frames per second on my machine, including the time  
> taken to encode the video to MPEG2 format.
>
>
> I'm working on a build system that would enable you to create your  
> own custom Soft Rock DVD, hopefully I'll get it finished and  
> debugged before Christmas.  It will need a fair amount of  
> intermediate disk space (maybe 5-10 GB) because the following  
> deadlocks after a few frames:
>
>        / writesf~ WAV pipe -> toolame  encoder \
>       /                                         \
> Pd --<                                           >-- mplex multiplexer
>       \                                         /
>        \ GridFlow PPM pipe -> mpeg2enc encoder /
>
> I believe the root cause of the deadlock is either or both of  
> writesf~ and GridFlow using blocking I/O rather than non-blocking I/ 
> O, from what I have read mjpegtools is written to play nice with  
> fifo's.
>
> The intent is to generate a sequence of unique (but similar) DVDs  
> from around 1 MB of pd/bash/make code and a small amount of seed data.
>
>
> > Thanks for sharing!
> > p
>
> Thanks for the feedback!
>
>
>
> Claude
> -- 
> http://claudiusmaximus.goto10.org
>
>
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