[FFmpeg-user] map_channel deprecated

[Elliott Balsley]

I've been using ffmpeg with -map_channel to extract two channels from a multi-channel audio stream.  It works, but gives this warning:
-map_channel is forwarded to lavfi similarly to -af pan=0x3:c0=c0:c1=c1.
[pan @ 0x7f8e9b42bde0] This syntax is deprecated. Use '|' to separate the list items.

I have a hard time finding good documentation on lavfi, and don't really understand how to use it.  Is there a better (non-deprecated) way of doing this?
My command is ffmpeg -i 1.mov -map_channel 0.1.0 -map_channel 0.1.1 -vn 1.mp4 and I pasted the full output at http://pastebin.com/NRsur5c3