Looks like you didn't specify any audio codec. Nope, if I use this cmd line vlc.exe "GPID.webm" -I dummy -vvv --sout="#transcode{vcodec=none,acodec=mp3,ab=128,channels=2,samplerate=44100}:std{access=file,mux=dummy,dst='C:\Users\sengl\Videos\GPID.mp3'}" I get the MP3 file, but VL...