So, conda install imagemagick works on my machine. Not sure if we can get rid of brew altogether, but...

mplayer doesn't have a conda recipe, but I'm a little flummoxed why we need that; its only mentioned in travis.yml, and nowhere else in the code base. Everything else has a conda recipe.

Oh, hmm, my apologies I see we don't use conda for these builds. Sorry for the noise. I'm also not sure what's going on. Do the macOS nodes have Xcode etc?

🎉 I approve too. I cannot formally push the button even though this does not contain my code anymore because this is my PR. 😏

Note: The failing windows build is a diffent issue that seems to be numpy-related:

    setuptools.sandbox.SandboxViolation: SandboxViolation: mkdir('C:\\Users\\VSSADM~1\\AppData\\Local\\Temp\\easy_install-9z1ad109\\numpy-1.17.2\\build', 511) {}
    
    The package setup script has attempted to modify files on your system
    that are not within the EasyInstall build area, and has been aborted.
    
    This package cannot be safely installed by EasyInstall, and may not
    support alternate installation locations even if you run its setup
    script by hand.  Please inform the package's author and the EasyInstall
    maintainers to find out if a fix or workaround is available.

@meeseekdev backport to v3.2.x

This needs to land on v3.2.x as that branch also runs on travis

@meeseeksdev backport to v3.2.x