added comment for dealing with error messages about ffmpeg
added comment for dealing with error messages about ffmpeg

bionoid/kivy,janssen/kivy,CuriousLearner/kivy,akshayaurora/kivy,rnixx/kivy,janssen/kivy,cbenhagen/kivy,cbenhagen/kivy,jkankiewicz/kivy,janssen/kivy,inclement/kivy,kivy/kivy,akshayaurora/kivy,Cheaterman/kivy,LogicalDash/kivy,CuriousLearner/kivy,tony/kivy,kived/kivy,jegger/kivy,rnixx/kivy,inclement/kivy,rafalo1333/kivy,KeyWeeUsr/kivy,matham/kivy,arlowhite/kivy,autosportlabs/kivy,manthansharma/kivy,jegger/kivy,rafalo1333/kivy,aron-bordin/kivy,rnixx/kivy,arlowhite/kivy,bionoid/kivy,CuriousLearner/kivy,Cheaterman/kivy,akshayaurora/kivy,vitorio/kivy,aron-bordin/kivy,Cheaterman/kivy,LogicalDash/kivy,arlowhite/kivy,jegger/kivy,bionoid/kivy,el-ethan/kivy,inclement/kivy,darkopevec/kivy,tony/kivy,jkankiewicz/kivy,darkopevec/kivy,KeyWeeUsr/kivy,matham/kivy,janssen/kivy,matham/kivy,manthansharma/kivy,andnovar/kivy,el-ethan/kivy,andnovar/kivy,autosportlabs/kivy,rafalo1333/kivy,kived/kivy,Cheaterman/kivy,vitorio/kivy,kivy/kivy,matham/kivy,jkankiewicz/kivy,jegger/kivy,manthansharma/kivy,aron-bordin/kivy,KeyWeeUsr/kivy,autosportlabs/kivy,KeyWeeUsr/kivy,LogicalDash/kivy,LogicalDash/kivy,darkopevec/kivy,bionoid/kivy,jkankiewicz/kivy,manthansharma/kivy,darkopevec/kivy,aron-bordin/kivy,cbenhagen/kivy,kivy/kivy,andnovar/kivy,kived/kivy,el-ethan/kivy,tony/kivy,vitorio/kivy