joinsrt

#!/bin/bash

OUTDIR=$(mktemp -p . -d)

for FILE in "$@"; do
    SRT="${FILE%.*}.srt"
    ffmpeg -i "${FILE}" -i "${SRT}" -metadata:s:s:0 language=en -metadata:s:a:0 language=en -c copy "${OUTDIR}/${FILE%.*}.mkv"
    rm "${FILE}"
    rm "${SRT}"
    mkvmerge -o "${FILE%.*}.mkv" "${OUTDIR}/${FILE%.*}.mkv"
    rm "${OUTDIR}/${FILE%.*}.mkv"
done

rmdir "${OUTDIR}"