X-Git-Url: https://code.delx.au/transcoding/blobdiff_plain/2a1eb6d426529b0c91d47c6b3e775104a7b734b0..98fa85aa71088f8025d8f17366fe2a0468cb1fc3:/fix-pal-speedup

diff --git a/fix-pal-speedup b/fix-pal-speedup
index edac664..5e6f8d4 100755
--- a/fix-pal-speedup
+++ b/fix-pal-speedup
@@ -1,39 +1,36 @@
 #!/bin/bash -e
 
-# Many DVDs released in Australia are sped up from 23.976fps to 25fps.
+# Many DVDs released in Australia are sped up from 24fps to 25fps.
 # This script reverses the procedure, correcting the audio pitch.
-# Input files are assumed to be mkv files with track 2 audio.
 # The video framerate is adjusted without re-encoding. The audio is slowed and
-# normalised then re-encoded as mp3.
+# volume normalised then re-encoded as mp3.
 
 if [ -z "$1" -o -z "$2" ]; then
-	echo "Usage: $0 destdir infile"
+	echo "Usage: $0 destdir infile [infile ...]"
 	exit 1
 fi
 
-# FORCEFPS = 24000 / 1001
-# SLOWDOWN = FORCEFPS / 25
-FORCEFPS="23.976023976023978"
-SLOWDOWN="0.9590409590409591"
+FORCEFPS="24"
+SLOWDOWN="0.96"
 
 destdir="$1"
-infile="$2"
-outfile="$destdir/$(basename "$infile")"
-tmpdir="$(tempfile -p 'pal-')"
-rm "$tmpdir"
-
-if [ -f "$outfile" ]; then
-	echo "Not overwriting $outfile"
-	exit 0
-fi
+shift
+
+for infile in "$@"; do
+	outfile="$destdir/$(basename "$infile")"
+
+	if [ -f "$outfile" ]; then
+		echo "Not overwriting $outfile"
+		continue
+	fi
 
-set -x
-mkdir "$tmpdir"
-mkvextract tracks "$infile" 2:"${tmpdir}/audio"
-mplayer -ao pcm:file="${tmpdir}/audio.wav" -vo null "${tmpdir}/audio"
-sox "${tmpdir}/audio.wav" "${tmpdir}/audio-fixed.wav" speed "${SLOWDOWN}" gain -n
-lame --preset standard "${tmpdir}/audio-fixed.wav" "${tmpdir}/audio.mp3"
-mkvmerge -o "${outfile}" --default-duration "1:${FORCEFPS}fps" --no-audio "$infile" "${tmpdir}/audio.mp3"
+	set -x
+	tmpdir="$(mktemp -d "${TMPDIR:-/var/tmp}/pal-XXXXXXXX")"
+	mplayer -novideo -ao pcm:file="${tmpdir}/audio.wav" -vo null "$infile"
+	sox "${tmpdir}/audio.wav" "${tmpdir}/audio-fixed.wav" speed "${SLOWDOWN}" gain -n
+	lame --preset standard "${tmpdir}/audio-fixed.wav" "${tmpdir}/audio.mp3"
+	mkvmerge -o "${outfile}" --default-duration "1:${FORCEFPS}fps" --no-audio "$infile" "${tmpdir}/audio.mp3"
 
-rm -rf "$tmpdir"
+	rm -rf "$tmpdir"
+done