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AAC to AC3 Bash Schell Script Readme AAC2AC3 is a Bash Shell script that converts a MP4 or MKV video file with an AAC audio track to a MKV video file with an AC3 audio track. The resulting AC3 audio track can be appended (resulting in a MKV video file that contains the existing audio tracks plus the new AC3 audio track) or the resulting AC3 audio track can replace all existing audio tracks (resulting in a MKV video file that contains only the new AC3 audio track). Required tools: MKVToolnix (install Ubuntu mkvtoolnix package) FAAD2 (install Ubuntu faad package) Aften (install Ubuntu aften package) Required information asked during conversion: AAC audio track sample rate AAC audio track channel count Usage: AAC2AC3 Input_File Output_File [Optional_Working_Directory]