Adding subtitles with FFmpeg

[Nico Darko]

Hi.
So I have this command line that I use to convert the audio from eac3 to ac3

for %%a in (*.mkv) do ffmpeg -y -i "%%a" -map 0 -c:v copy -c:a ac3 -b:a 640k -c:s copy "output_%%~na.mkv"

But I would like to include in that a way to have the original eac3 audio as a second track, and add a srt file that has the same name in my folder. How can I add those two things?

Thank you.

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