参考までにオプションこれね

ffmpeg.exe -rtbufsize 256MB -f dshow -i video="SCFF DirectShow Filter":audio="virtual-audio-capturer"
-threads 0 -r 30 -s 854x480 -sws_flags lanczos -pix_fmt yuv420p -vf "unsharp=3:3:0.5" -b:v 587k -maxrate 587k
-bufsize 587k -vcodec libx264 -preset slower -profile:v high -x264opts "me=umh:ref=5:bframes=3:trellis=1:subme=8:
keyint=250:qpmin=0:qpmax=69:rc-lookahead=50:min-keyint=25" -async 100 -acodec libfdk_aac -profile:a aac_he
-signaling implicit -afterburner 1 -ar 48000 -ab 64k -ac 2 -vol 256 -f flv pipe: | ffmpeg.exe -loglevel panic
-i - -codec copy -f flv "rtmp://localhost/live/livestream" -r 30 -codec copy "c:\haisin.mp4"