I thought at first you just diff:ed the file against mplayer's code however, as mplayer's uses the old mpglib code, one could also ask mplayer's team to release the diffs they made to mpglib as LGPL (which they have to...)
They don't have to (although it would certainly be kind of them to do so, particularly in this case).
Section 3 of the LGPL states: "3. You may opt to apply the terms of the ordinary GNU General Public License instead of this License to a given copy of the Library. To do this, you must alter all the notices that refer to this License, so that they refer to the ordinary GNU General Public License, version 2, instead of to this License. (If a newer version than version 2 of the ordinary GNU General Public License has appeared, then you can specify that version instead if you wish.) Do not make any other change in these notices.
"Once this change is made in a given copy, it is irreversible for that copy, so the ordinary GNU General Public License applies to all subsequent copies and derivative works made from that copy."
--Daniel Remenak
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Daniel Remenak