Currently, I use this for transcoding one of my MKV videos: :sout=#transcode{vcodec=h264,vb=800,scale=0.65,acodec=mp3,ab=96,channels=2,samplerate=44100}:std{access=http,mux=asf,dst=127.0.0.1:1234} It's grabbing the default audio track. How do I change my parameters to grab the 2nd audio track instead?