X-Git-Url: https://code.delx.au/transcoding/blobdiff_plain/3f4e270f745bb047a89416d6f2d9a6b2977611c2..19b49083e7946fe60a37912ed449a41da7c1ba70:/fix-pal-speedup

diff --git a/fix-pal-speedup b/fix-pal-speedup
index 05a4b9a..17e5e01 100755
--- a/fix-pal-speedup
+++ b/fix-pal-speedup
@@ -6,7 +6,7 @@
 # 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
 
@@ -19,8 +19,24 @@ function mux_replace_audio {
     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 get_video_trackid {
+    mkvmerge -i "$1" | sed -n 's/Track ID \([0-9]*\): .*video.*/\1/p'
+}
+
+function get_audio_delay {
+    mkvmerge -F json -i "$1" | \
+        jq -r '.tracks[] | select(.type == "audio") | .properties.minimum_timestamp'
 }
 
 function encode_audio {
@@ -37,24 +53,13 @@ function convert_file {
     local outfile="$2"
     local audiofile="${tmpdir}/audiofile.m4a"
 
-    encode_audio "${infile}" "${audiofile}"
-    mux_replace_audio "${infile}" "${audiofile}" "${outfile}"
+    encode_audio "$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"