I tried to report this to the MythTV crew but got the response that OSS should not be turned off. For more information check out Ticket #1373 in MythTV-trac. http://svn.mythtv.org/trac/ticket/1373 As the suggested resolution by the developer is to not disable OSS, then might i suggest that something could be done to the ebuild? For example removing the OSS useflag and/or requiring OSS in the kernel? (Users should not be able to compile it with a -oss useflag) (Not sure though if OSS needs to be enabled in the kernel for that feature to work..)
Included the patch for this in mythtv-0.19_p9163.... so Fixed in CVS.