# slowed, and encoded as AAC, preserving surround sound.
if [ -z "$1" -o -z "$2" ]; then
- echo "Usage: $0 destdir infile [infile ...]"
+ echo "Usage: $0 infile outfile"
exit 1
fi
set -xe
FORCEFPS="24"
-SLOWFILTER="-filter asetrate=46080,aresample=48000"
+SLOWFILTER="-filter asetrate=46080,aresample=osr=48000:resampler=soxr"
function mux_replace_audio {
local infile="$1"
local audiofile="$2"
local outfile="$3"
- local trackid="$(mkvmerge -i "$infile" | grep 'Track ID.*video' | sed 's/^Track ID \(.\):.*$/\1/')"
- mkvmerge -o "${outfile}" --default-duration "${trackid}:${FORCEFPS}fps" --no-audio "$infile" "$audiofile"
+ local audiodelay="$(get_audio_delay "$infile")"
+ local videotrackid="$(get_video_trackid "$infile")"
+
+ mkvmerge \
+ -o "${outfile}" \
+ --default-duration "${videotrackid}:${FORCEFPS}fps" \
+ --no-audio "$infile" \
+ --sync "0:$((audiodelay / 1000000))" \
+ "$audiofile"
}
-function extract_audio {
- local infile="$1"
- local outfile="$2"
+function get_video_trackid {
+ mkvmerge -i "$1" | sed -n 's/Track ID \([0-9]*\): .*video.*/\1/p'
+}
- mplayer \
- -noconfig all \
- -novideo \
- -channels 8 \
- -dumpaudio \
- -dumpfile "$outfile" \
- "$infile"
+function get_audio_delay {
+ mkvmerge -F verbose-text -i "$1" | \
+ sed -n 's/Track ID [0-9]*: .*audio.*minimum_timestamp:\([0-9]*\).*/\1/p'
}
function encode_audio {
ffmpeg \
-i "$1" \
+ -vn \
$SLOWFILTER \
- -strict experimental \
+ -c:a libfdk_aac -vbr 3 \
"$2"
}
function convert_file {
local infile="$1"
local outfile="$2"
- local audio1="${tmpdir}/audio1.ac3"
- local audio2="${tmpdir}/audio2.m4a"
+ local audiofile="${tmpdir}/audiofile.m4a"
- extract_audio "${infile}" "${audio1}"
- encode_audio "${audio1}" "${audio2}"
- mux_replace_audio "${infile}" "${audio2}" "${outfile}"
+ encode_audio "$infile" "$audiofile"
+ mux_replace_audio "$infile" "$audiofile" "$outfile"
}
-destdir="$1"
-shift
-
-for infile in "$@"; do
- outfile="$destdir/$(basename "$infile")"
-
- if [ -f "$outfile" ]; then
- echo "Not overwriting $outfile"
- continue
- fi
-
- tmpdir="$(mktemp -d "${TMPDIR:-/var/tmp}/pal-XXXXXXXX")"
- convert_file "$infile" "$outfile"
- rm -rf "$tmpdir"
-done
-
+infile="$1"
+outfile="$2"
+tmpdir="$(mktemp -d "${TMPDIR:-/var/tmp}/pal-XXXXXXXX")"
+convert_file "$infile" "$outfile"
+rm -rf "$tmpdir"