I followed these instructions
Setting up aMule's video preview feature:
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You can use a video player like VLC or Mplayer to preview incomplete downloads of video files. To set up aMule properly for this, go to Preferences -> Directories. Under "Video Player", you have to enter "/usr/bin/open -a" together with the path of your video player program.
For example:
/usr/bin/open -a "/Applications/VLC.app"
/usr/bin/open -a "/Applications/vlc-0.8.4a/VLC.app"
/usr/bin/open -a "/Applications/MPlayer OS X 2.0b8r5/MPlayer OS X 2.app"
In my case I entered:
/usr/bin/open -a "/Applications/Media players/VLC.app"
Then clicking on a file and choosing "preview", it said "Please set your prefered video player on preferences. Meanwhile, aMule will attempt to use mplayer and you will get this warning on every preview"
It then did nothing (I don't have mplayer). And, I had already entered that line as instructed, in preferences.
Any ideas?
Thank you!
Justin