script for delaying audio in a video

delayaudio

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+# delay the audio by using the same video file as two inputs
+# for ffmpeg, one offset by $1 seconds. Take the video of the
+# first, the audio of the offset one. Negative offsets are ok.
+
+set -eu
+
+if [ "$#" -ne 2 ]; then
+  echo "USAGE: $0 DELAY FILE"
+  exit 1
+fi
+
+fullpath="$2"
+source fileextensions
+
+cd "$dir"
+ffmpeg -i "$filename.$extension" -itsoffset "$1" -i "$filename.$extension" -map 0:v -map 1:a -c copy "$filename""_delayed.$extension"