Haihao Xiang authored Feb 22, 2019 and Víctor Manuel Jáquez Leal committed Feb 27, 2019

MSDK library requires 16 alignment for vp8/vp9, otherwise a pipeline
for vp8/vp9 decoding might fail.

example pipeline:
gst-launch-1.0 filesrc location=vp8_1280x720.webm ! matroskademux ! \
msdkvp8dec ! fakesink

0:00:00.150565444 10657 0x55c8484036d0 ERROR                msdkdec
gstmsdkdec.c:1056:gst_msdkdec_handle_frame:<msdkvp8dec0>
DecodeFrameAsync failed (invalid video parameters)