GPAC contains various MPEG-4 authoring/playback tools ( http://gpac.sourceforge.net ). I wasn't able to check oss support, it fails to compile on undefined reference for 'AudioDriver'. wx-based player doesn't work here either. It compiles, but crashes on running after selecting plugins dir.
Created attachment 40251 [details] media-video/gpac-0.2.0.ebuild Teh ebuild
Created attachment 42465 [details] media-video/gpac-0.2.1.ebuild New version, player crashes seem to be fixed.
Created attachment 54849 [details] gpac-0.2.1.ebuild Placeholder for when I can work around package.mask.
That took awhile. Fixed in cvs. Thanks for reporting and using Gentoo!