+ local tmpdir=""
+ tmpdir="$(mktemp -d "${TMPDIR:-/var/tmp}/pal-XXXXXXXX")"
+ local audiofile="${tmpdir}/audiofile.m4a"
+
+ encode_audio "$infile" "$audiofile"
+ remux_file "$infile" "$audiofile" "$outfile"
+
+ rm -rf "$tmpdir"
+}
+
+function encode_audio {
+ ffmpeg \
+ -i "$1" \
+ -vn \
+ "${SLOWFILTER[@]}" \
+ -c:a libfdk_aac -vbr 3 \
+ "$2"
+}
+
+function remux_file {
+ local infile="$1"
+ local audiofile="$2"
+ local outfile="$3"
+
+ local audiodelay=""
+ audiodelay="$(get_minimum_timestamp "$infile" "audio")"
+
+ local videodelay=""
+ videodelay="$(get_minimum_timestamp "$infile" "video")"
+
+ local videotrackid=""
+ videotrackid="$(get_track_id "$infile" "video")"
+
+ local suboptions=()
+ local subtitletrackid=""
+ while read -r subtitletrackid; do
+ suboptions+=("--sync" "${subtitletrackid}:0,${OLDFPS}/${NEWFPS}")
+ done < <(get_track_id "$infile" "subtitles")
+
+ local chapteroptions=()
+ if [ "$(get_chapter_count "$infile")" -gt 0 ]; then
+ chapteroptions=("--chapter-sync" "0,${OLDFPS}/${NEWFPS}")
+ fi
+
+ mkvmerge \
+ -o "${outfile}" \
+ --default-duration "${videotrackid}:${NEWFPS}fps" \
+ --sync "${videotrackid}:$((videodelay / 1000000))" \
+ "${chapteroptions[@]}" \
+ "${suboptions[@]}" \
+ --no-audio "$infile" \
+ --sync "0:$((audiodelay / 1000000))" \
+ "$audiofile"
+}
+
+function get_track_id {
+ mkvmerge -i -F json "$1" | jq -r ".tracks[] | select(.type == \"$2\") | .id"
+}