review qemplayer

[wbrana]

> btw, why do you need mplayer_nice in the first place?
> afaiu, qemplayer is an qt frontend to mplayer, and does not need
> realtime I/O priorities any more than mplayer itself.
mplayer_nice is key feature of qemplayer.
Realtime I/O priority for MPlayer is needed when some other
application is fully loading hard drive.
It prevents empty buffer in MPlayer.
Nice -20 ensures that MPlayer always gets needed CPU time if some
other application fully loading CPU.

> "mplayer_nice" could be provided by a separate binary package
I will consider it.