After making `ffmpeg` point to the latest `ffmpeg_4`, all packages that used `ffmpeg` without requiring a specific version now use ffmpeg_3 explicitly so they shouldn't change.
treewide replacement of stdenv.mkDerivation rec { name = "*-${version}"; version = "*"; to pname
* yaxg: init at 2018-07-20 * yaxg: replaced makeWrapper with wrapProgram * yaxg: Fixed version number and some formatting