Change the passthrough filter to a noformat filter. It's now similar to

Change the passthrough filter to a noformat filter.  It's now similar to
the mplayer noformat filter except that the default behavior if no formats
are specified is to allow allow all formats (ie. virtually the same as the
old passthrough behavior)

Commited in SoC by Bobby Bingham on 2007-12-24 21:42:56

Originally committed as revision 12033 to svn://svn.ffmpeg.org/ffmpeg/trunk