Add mute-video script

bin/mute-video

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+set -e
+set -u
+set -o pipefail
+
+if (($# == 0)); then
+	echo "usage: mute-video VIDEO [VIDEO...]" >&2
+	exit 1
+fi
+
+for input in "$@"; do
+	if [[ ! -f "$input" ]]; then
+		echo "mute-video: not a file: $input" >&2
+		exit 1
+	fi
+
+	dir=$(dirname -- "$input")
+	base=$(basename -- "$input")
+	name="${base%.*}"
+	ext="${base##*.}"
+	output="$dir/$name.mute.$ext"
+
+	ffmpeg -i "$input" -c copy -an "$output"
+	echo "Wrote $output"
+done