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I had been using Gem 0.93 installed from Ubuntu 18.04 packages. No problem with pix_film or pix_video. But, some of the help patches were crashing against Pd 0.50, so I thought I should upgrade.
https://packages.debian.org/buster/gem -- unclear to me if this is valid for Ubuntu Studio 18.04.
A member on the Pd forum suggested that I build from source. So I cloned the repository, 'autogen' 'configure' 'make' etc. This went relatively painlessly, except that I had to do it twice because the current README, as far as I can see, doesn't mention required packages to build the video plug-ins. After installing those packages, [pix_film] is working.
BUT [pix_video] is not.
Opening a patch that contains a [pix_video] object:
Turning on rendering:
So I suppose I need to install some other package(s), but the current README contains not much detail about
In any case, the current situation is that a Linux user can build Gem from source, but some features are disabled. So the documentation seems insufficient.
Linux ---- 4.15.0-70-lowlatency #79-Ubuntu SMP PREEMPT Tue Nov 12 11:30:17 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
No problems with video rendering.
Can't find the camera ID but Skype can open the camera without any problem. Also, the older version of Gem could use the camera.
"tried /usr/local/lib/pd/extra/Gem/Gem.pd_linux and succeeded" but others failed.
Ah, OK, installed libv4l-dev and rebuilt. Now it's working.
Feel free to close (though I'd suggest this sort of detail should be documented with the build instructions).