ff wrapper scripts: vmaf and rename moov

ffvmaf

@@ -0,0 +1,19 @@
+#!/bin/sh
+set -ef
+
+while getopts :s:t:T: OPT; do
+	case "$OPT" in
+		s) start="$OPTARG" ;;
+		t) time="$OPTARG" ;;
+		T) to="$OPTARG" ;;
+		*) : ;
+	esac
+done
+shift $((OPTIND - 1))
+
+exec ffmpeg ${start:+-ss "$start"} ${to:+-to "$to"} \
+	-i "$1" -i "$2" ${time:+-t "$time"} \
+	-lavfi "[0:v] setpts=PTS-STARTPTS [ref]; \
+			[1:v] setpts=PTS-STARTPTS [dis]; \
+			[dis][ref] libvmaf=log_fmt=xml:log_path=/dev/stdout:n_threads=$(nproc)" \
+	-f null - \