Added an error check on the finalizeAudioMix.
Added an error check on the finalizeAudioMix.

tisohjung/SCRecorder,gank0326/cutVideo,yangyi/SCRecorder,williamldennis/screcorder2,MaticKunaver/SCRecorder,CaptainKurt/SCRecorder,williamldennis/screcorder2,SuPair/SCRecorder,skonb/SCRecorder,henriquevelloso/SCRecorder,skonb/SCRecorder,wubingwell/SCRecorder,LeoRunning/SCRecorder,hojustin/SCRecorder,JarryChang/SCRecorder,fjcaetano/SCRecorder,wubingwell/SCRecorder,rudywen/SCRecorder,techvein/SCRecorder,olivierlesnicki/SCRecorder,LeoRunning/SCRecorder,renjithn/SCRecorder,twomedia/SCRecorder,jspenc72/SCRecorder,hanhailong/SCRecorder,JarryChang/SCRecorder,CaptainKurt/SCRecorder,renjithn/SCRecorder,olivierlesnicki/SCRecorder,hojustin/SCRecorder,tisohjung/SCRecorder,MaticKunaver/SCRecorder,henriquevelloso/SCRecorder,Neal2014/SCRecorder,RevealHQ/SCRecorder,RevealHQ/SCRecorder,techvein/SCRecorder,imjerrybao/SCRecorder,fjcaetano/SCRecorder,Mabdylon/SCAudioVideoRecorder,rFlex/SCRecorder,MaticKunaver/SCRecorder,rFlex/SCRecorder,rudywen/SCRecorder,jspenc72/SCRecorder,xezero/SCRecorder,jpike88/SCRecorder,twomedia/SCRecorder,xezero/SCRecorder,SuPair/SCRecorder,hanhailong/SCRecorder,CaptainKurt/SCRecorder,yangyi/SCRecorder,hojustin/SCRecorder,Neal2014/SCRecorder,imjerrybao/SCRecorder,gank0326/cutVideo,jpike88/SCRecorder