https://www.youtube.com/watch?v=es5SVtRfwV4 -
MplayerX comparison with VLC
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Pros

Pro Pleasant Mac Style view
MplayerX fits in OSX environment perfectly with it’s hot keys and plain, but stylish design, giving pleasure to work with

Pro Players “memory” of a last reproduced file
If turned off, player will start file reproduction from exact spot it was interrupted on

Pro Smart-play or automatic next video file search
For example, if number of files with sequent names are mashed up and thrown in the playlist, MplayerX is able to reproduce them in right order

Pro Smart multi-touch control
Convenient track pad commands, that allows user to toggle full screen, change frame size, aspect ratio and volume. To learn more, watch an easy and understandable "how-to" youtube video in the sources.

Pro Compatibility with other Apple products
File reproduction can be controled with an Apple remote, that awards user with more freedom. Furthermore, dirrect pass through is possible. Start streaming, connect and enjoy your home theatre

Pro Softwere was designed specially for OS X
As OS X is the only supporting system, the amount of bugs and problems is minimized. This also means, that player can play .m4p, .mp4 & .mov video files.
Cons

Con System crash is more frequent
MPlayerX creshes occur more often than in usual video players. They should be tackled properly.

Con High CPU usage is possible
Sometimes after the player or OS X update file reproduction can demand a significant part of CPU usage

Con No proper playlist feature
In spite of easy and comfy smart-play, in general playlist isn’t user friendly

Con No retina display support on old OSX
MPlayerX does not support retina display on OS X older than Mountain Lion, but amount of Mac’s with older OS X are quite rare nowadays
Commonly Compared
