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Important! You must change the output channel to a higher number if there are multiple audio streams to prevent overwriting them. -c:a:1 aac Output the audio to a 2nd audio channel (0 = first channel) in aac format.-map 0:a:0 Tell ffmpeg to read the first audio stream for the following arguments.-map 0 Tell ffmpeg read all Video, Audio, and Subtitle streams for the following arguments.

ffmpeg -i INPUT.mkv The application and input file.It will be in AAC anycodings_audio 384k.įfmpeg -i INPUT.mkv -strict -2 -map 0 -c anycodings_audio copy -map 0:a:0 -c:a:1 aac -b:a 384k -ac anycodings_audio 2 OUTPUT.mkv Explanation of the command This command will take a video with 1 anycodings_audio audio stream, and downmix to stereo and anycodings_audio convert the audio stream and add it as a anycodings_audio 2nd audio stream. Maybe someone anycodings_audio have more knowledge about it? 0 T04:44:49+00:00 T04:44:49+00:00 Answer Link It is not a great encoder, but it is not too bad at higher bitrates.Īccording to wikipedia, there is no anycodings_audio difference between AC3 and ATSC A/52: anycodings_audio the 1st one is the name of the codec, anycodings_audio the 2nd is the name of the standard anycodings_audio specifying the AC3 codec. strict -2 is required as a way that you acknowledge that the encoder is designated as experimental. -strict -2 -c:a aac – Use the native FFmpeg AAC audio encoder.-c:a copy – Stream copy the audio.-map 0:a – Designate the audio stream(s) from the first input as a source for the output file.-c:v copy – Stream copy the video.-map 0:v – Designate the video stream(s) from the first input as a source for the output file.-y – A global option to overwrite the output file if it already exists.This works for me: ffmpeg -y -i Source.mkv -map 0:v -c:v copy -map 0:a -c:a copy -map 0:a -strict -2 -c:a aac out.mkv