Testing av_downmix_info_update_side_data()
create: OK
defaults: type=0 center=0.000 center_ltrt=0.000 surround=0.000 surround_ltrt=0.000 lfe=0.000
write: type=2 center=0.500 center_ltrt=0.625 surround=0.250 surround_ltrt=0.375 lfe=0.125
reuse: same_pointer=yes preserved_type=2 preserved_center=0.500

Testing OOM path
OOM: OK
