Introduced in [5ead92ffd58088828ed802173d963b2571f0cd69], on PowerPC-based Macs this breaks the playback of a certain AVI and WMV files for reasons not fully understood. The commit was reverted for PPC macs in
* [49f3721c5baa88feece1d8793f08f08b2ed86a4d]
* [7786caa59f70d40794273cd741ea96f98d43621f]
but these commits were never applied to the master branch.