ffmpeg -i in.wav -filter_complex "channelsplit=channel_layout=5.1[FL][FR][FC][LFE][BL][BR]" -map "[FL]" -compression_level 8 Front\ Left.flac -map "[FR]" -compression_level 8 Front\ Right.flac -map "[FC]" -compression_level 8 Front\ Center.flac -map "[LFE]" -compression_level 8 LFE.flac -map "[BL]" -compression_level 8 Back\ Left.flac -map "[BR]" -compression_level 8 Back\ Right.flac
ffmpeg -i in.wav -filter_complex "channelsplit=channel_layout=7.1[FL][FR][FC][LFE][BL][BR][SL][SR]" -map "[FL]" -compression_level 8 Front\ Left.flac -map "[FR]" -compression_level 8 Front\ Right.flac -map "[FC]" -compression_level 8 Front\ Center.flac -map "[LFE]" -compression_level 8 LFE.flac -map "[BL]" -compression_level 8 Back\ Left.flac -map "[BR]" -compression_level 8 Back\ Right.flac -map "[SL]" -compression_level 8 Side\ Left.flac -map "[SR]" -compression_level 8 Side\ Right.flac