I want to process MKV files by mixing down the audio to 128kbps AAC on 2 channels while just copying video and subtitle tracks. So I run:

ffmpeg -i input.mkv -c:s copy -c:v copy -c:a aac -ab 128k -ac 2 output.mkv

However, MediaInfo shows that the audio bitrate is 224kbps.

What info should I trust?

  • 1
    Share full log, and mediainfo readout.
    – Gyan
    Sep 28 at 3:33

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