![]() ![]() The -ac 2 switch works by mixing proportions of the first 5 channels from the source's 6-channel stream - Back Left, Back Right, Front Left, Front Right and Front Center - into the Front Left and Front Right channels of the output stereo stream: Should be preferred (the -ac option) over the pan filter unless you Note: ffmpeg integrates a default down-mix (and up-mix) system that Most importantly, it's worth bearing in mind that Gregory's answer, currently the top-voted answer to this question, is no different than using the -ac 2 switch - more on this below.Äownmixing a 5.1 channel audio stream to stereo with -ac 2įFmpeg comes with built-in capabilities for downmixing a 5.1 track to stereo, and this is also the solution that FFmpeg's own documentation recommends: This answer is an attempt to streamline the information in these answers while doing away with the problems in them. The answers on this question have since become a bit of a mess, with many containing redundant information and others complete inaccuracies. ![]()
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