hi jon,
something like this should work:
gemhead | pix_video | pix_texture | pix_rectangle
In your patch, you convert the gemlist that the gemhead sends out every 50 ms (and that gem needs to actually render something) to the message "Driver 1". I'm not familiar with the pix_video on linux, but you probably need to send this message only once to pix_video:
gemhead | | |driver 1( |/ pix_video | pix_texture | rectangle
hope this helps, thoralf.
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