This trivial patch adds "avc1" as fourcc for h264 in mp4, which makes it
a little bit more standard, although it still seems to lack some
metadata. Anyway, recent mplayer plays these streams without problems.
It also has two globally scoped global structs changed to "static".
patch by (Erik Slagter <erik slagter name)
Originally committed as revision 4386 to svn://svn.ffmpeg.org/ffmpeg/trunk