Original audio source

It is possible to add a feature like "audiocopy" to bring the original audio source to the mp4 file?

At the moment i must do for every m2ts file a demuxing from the audio-source (ac3 or dts) and a adding with mkvtoolnix in the mp4 file to get the original audio source.

BTW: with "audiocopy" badaboom no need to convert the audiotrack and save prozessorpower...

Best Regards,