add snapshot helper tool

make-snapshots.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+if ! pushd $1 >/dev/null 2>&1; then
+	echo "call with a project-name, eg. './make-snapshots sotmeu14' after you rendered your dv-files."
+	exit 1
+fi
+
+ss=$2
+if [ -z $ss ]; then
+	# three seconds
+	ss=3
+fi
+
+for dv in *.dv; do
+	png="$(basename $dv .dv).png"
+	echo "$dv @ second $ss -> $png"
+	avconv -loglevel error -i $dv -ss $ss -frames:v 1 -vf scale='iw*sar:ih' -f image2 -c png $png;
+done
+
+popd >/dev/null 2>&1
+