blend filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>
avcodec_decode_audio4: check got_frame_ptr before handling initial skip

Fixes out of array accesses

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
matroska: fix missing ,

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>