Comment 10 for bug 1280794

On a closer look I don't see any big issue here. I happened to choose the only filetype as a test/example that *I've found* to be an issue - .mp4
When one uses ..Details > Default, ect on video there are these 2 lines concerning .mp4 created -
video/mp4=
video/mp4v-es=

So when both lines exist with a = of player A then nautilus > properties > open with doesn't work properly on a .mp4 when trying to set one or the other to player B as default
mimeapps.list will reflect the change but nautilus will not until the other line is either removed or edited to match
( most users will only have video/mp4 files..

So I guess this is a valid bug, albeit small, if would be good to know if there are any other 'conflicts' in video or audio mimes before considering an upstream bug.