ffmpeg -i xPASTExINPUTxFILExWITHxEXTx -map_channel 0.1.0 -c:v copy xPASTExOUTPUTxFILExMONOxWITHxEXTx

ffmpeg -i xPASTExINPUTxFILExWITHxEXTx -map_channel 0.1.0 -c:v copy xPASTExOUTPUTxFILExMONOxWITHxEXTx

ffmpeg -i xPASTExINPUTxFILExWITHxEXTx -map_channel 0.1.0 -c:v copy xPASTExOUTPUTxFILExMONOxWITHxEXTx