http://www.mplayerhq.hu/design7/projects.html

Blacklisted Projects
These projects took large pieces of code from (L)GPL video projects, and failed to mark their origins, despite of our requests.

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GOM Player (unverified)
Multimedia player containing FFmpeg that fails to give credit. They do include a copy of the LGPL, but don't mention FFmpeg. The only reference to FFmpeg seems to be this post.