ffmpeg -f dshow -i audio="virtual-audio-capturer" -f dshow -i audio="麥克風 (High Definition Audio 設備)" -filter_complex amix=inputs=2:duration=first:dropout_transition=2 -f dshow -i video="xthkCamera" -pix_fmt yuv420p -vcodec h264 -preset:v ultrafast -tune:v zerolatency -s 320x240 -acodec aac -ar 44100 -ac 2 -f flv -y d:/test.flv