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png encoded video crashes on repeat #239

hellocatfood opened this issue Oct 20, 2019 · 1 comment


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@hellocatfood hellocatfood commented Oct 20, 2019

I'm trying to play a video with transparency in Gem and it crashes Pd when it loops.

I was using the [pix_film] example with the [alpha] object inserted. Video attached. It was encoded a .mov using the following command:

ffmpeg -i input_image_00%02d.png -vcodec png

I'm using Gem 0.94 downloaded from Deken on Ubuntu 19.04


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@umlaeute umlaeute commented Oct 21, 2019

why don't you install Gem with your package manager?

sudo apt install gem

(and remove the "Gem/" installed via deken; currently you have to do that manually by navigating to wherever/your/deken/installpath/ and remove the Gem binary)

EDIT: actually remove the Gem/ folder in wherever/your/deken/installpath/

But anyhow, using gem from Ubuntu probably will not help you with this specific problem.

afaict, it is a problem in the underlying library used by the filmGMERLIN backend.
Disabling it in favour of the filmQT4L backend should fix the problem.

  • with deken installed Gem, move the file out of the way and restart Pd/Gem.
  • with apt installed Gem just uninstall the gem-plugin-gmerlin package.
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