With multi-threaded x264 working again, I get the following problem: When doing the encoding, on the 2nd pass, at the very end, I get the error from the subject line: "mencoder: common/frame.c:992: x264_frame_push_unused: Assertion `frame->i_reference_count > 0' failed." when looking for something similar, I get the following thread: http://mailman.videolan.org/pipermail/x264-devel/2009-September/006338.html In which for multi-threaded encoding param.i_sync_lookahead = 0; is suggested... Apparently, mencoder should do the same. (?) -- Cheers, Alex