Erik Moeller wrote:
"It is allowed to upload files in patent-encumbered formats like MP3 or the MPEG-4 codecs only provided that a version in a non-encumbered format is also uploaded. Files which are only provided in patent-encumbered formats should be deleted."
The problem is, someone would need to check that each MPEG file had a matching Ogg version. To do this, you need to play the MPEG file...
Some users complain that they can play MPEG but not Theora. I am in the opposite situation. I installed MPlayer a few minutes ago to play Storm.ogg, so I can play Ogg Theora, but I cannot play MPEG-4 because I live in the United States but have not paid license royalties. I run OpenBSD, so I also cannot obtain a licensed MPEG-4 player such as RealPlayer, QuickTime, or Windows Media Player.
Suppose some user wants to check if the Storm.mp4 that someone uploaded is the same as Storm.ogg. If this user has QuickTime, or lives in the European Union, that might be easy. If I did the check, I would go to a different computer with Mac OS X and QuickTime, which is an inconvenience for me, but not impossible.
-- [[Wikibooks:en:User:Kernigh]], and there is almost no audio or video at en.Wikibooks, but I sometimes find it at Commons and en.Wikipedia