Demuxer selection by name with -demuxer command (bakward compatible)
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16176 b3059339-0415-0410-9bf9-f77b7e298cf2
original code by Maxim Yevtyushkin <max@linuxmedialabs.com>
partially rewritten, "mplayerized" by me
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@11591 b3059339-0415-0410-9bf9-f77b7e298cf2