Running in MacOS terminal
My issue is that from a Terminal command line both Blender and ffmpeg will run however the bpsrender script will not run giving the error that both Blender and ffmpeg are not available. Ffmpeg was installed on the Mac via Homebrew and is in the PATH, just not where you are looking. The Blender.app was aliased. I assume that you are just shelling out to run both applications so could you add a command line option to not check if they are in the PATH.