[FFmpeg-user] correct syntax for using the pan filter

[jacob s]

anyone knows the proper way to use the pan filter ? I am trying to take a
stereo input and mute one channel and get a stereo output with one channel
muted.
This is my original command:
-rtbufsize 100000000  -f dshow -i
video="screen-capture-recorder":audio="SoundMAX Digital Audio" -vcodec
libx264 -preset ultrafast -tune zerolatency -r 10  -async 1 -ab 32k -ar
22050 -bsf:v h264_mp4toannexb -b 614400 -f mpegts udp://192.168.5.215:48550

According to the manual this is possible ( "If the input is a stereo audio
stream, you can mute the front left channel (and still keep the stereo
channel layout) with:  pan="stereo:c1=c1" ")
I tried this but it didn't work, I guess I am not using the correct cli
syntax.
Please reply with the correct way to use pan ( within my original command )

Thanks