Removed +len1 in call to s->mix_2_1_f() as I found no logical explanation for it. After removal, problem was gone. Signed-off-by: Hendrik Schreiber <hs@tagtraum.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc> (cherry picked from commit 647fd4b8292e3bfae30b1086aa842a5ee47ee868) Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>