add logs about video decoding status
add logs about video decoding status

related to #66

tedconf/flashls,viktorot/flashls,fixedmachine/flashls,thdtjsdn/flashls,Boxie5/flashls,School-Improvement-Network/flashls,jlacivita/flashls,Peer5/flashls,School-Improvement-Network/flashls,Peer5/flashls,mangui/flashls,stevemayhew/flashls,stevemayhew/flashls,aevange/flashls,vidible/vdb-flashls,codex-corp/flashls,Boxie5/flashls,loungelogic/flashls,ryanhefner/flashls,viktorot/flashls,suuhas/flashls,codex-corp/flashls,neilrackett/flashls,dighan/flashls,neilrackett/flashls,loungelogic/flashls,hola/flashls,hola/flashls,ryanhefner/flashls,clappr/flashls,School-Improvement-Network/flashls,JulianPena/flashls,ryanhefner/flashls,aevange/flashls,stevemayhew/flashls,Peer5/flashls,aevange/flashls,suuhas/flashls,NicolasSiver/flashls,fixedmachine/flashls,tedconf/flashls,NicolasSiver/flashls,JulianPena/flashls,mangui/flashls,jlacivita/flashls,vidible/vdb-flashls,dighan/flashls,clappr/flashls,ryanhefner/flashls,Peer5/flashls,thdtjsdn/flashls,stevemayhew/flashls,suuhas/flashls,Corey600/flashls,suuhas/flashls,viktorot/flashls,Corey600/flashls,aevange/flashls