Fixes #11690

#11690 still fails to play with avcodec after that fix but is fine with libvpx
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit eadf306345f0e545c51af9a49925756e258538ba)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>