h264dump: add buffering_period sei
h264dump: add buffering_period sei

kierank/bmxlib-bmx,Limecraft/ebu-bmx,stuarthicks/bmx,Limecraft/ebu-bmx,xunchangguo/BMX,stuarthicks/bmx,stuarthicks/bmx,xunchangguo/BMX,kierank/bmxlib-bmx,kierank/bmxlib-bmx,Limecraft/ebu-bmx,xunchangguo/BMX