Converting 6 audio channels to 2 in ffmpeg -

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im doing 2 pass encode on uploads site.

unfortunately when user uploads 6 audio channel .mkv files (5.1 surround), ffmpeg spits out following error:

resampling input channels greater 2 unsupported.

im running latest version of ffmpeg. doing -ac 6 instead of usual - ac 2 proceeds encoding, creates larger file useless data, creates step in long file processing script, , i'd rather avoid modifying conversion command.

is there can make -ac 2 work?

it known bug/limitation of current ffmpeg.

in experience concluded can't done ffmpeg alone.

you have transcode audio/video separately.

1) extract .wav file source movie.
2) resample 2ch stereo audio editing tool such audacity.
3) encode audio stream
3) transcode video stream
4) mux audio/video target format


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