ffmpeg export center channel as .wav

[geextah_2]

Hi, I want to export the center channel from 5.1 to .wav from a .mkv that has 1 video and 2 audio tracks (1 german, 1 english), I want to target the audio track with the "ger" tag

this exports the center channel to mono .wav

-filter_complex "channelsplit=channel_layout=5.1:channels=FC[FC]" -map "[FC]" -ar 44100

but I want to target the german audio track

-map 0:a:m:language:ger

Thank you
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edit: okay I solved it

-filter_complex "[0:a:m:language:ger]channelsplit=channel_layout=5.1:channels=FC[FC]" -map "[FC]" -ar 44100