Re-add video concatenate example

.gitignore

@@ -2,4 +2,5 @@ videos
 output
 frames
 node/node_modules
-*.pth
+*.pth
+videos.txt

ffmpeg/basic/concat.sh

@@ -0,0 +1,34 @@
+#!/bin/bash -e
+
+#####################################################
+# 
+# This script will concatenate two videos in order
+# and output the new video as ProRes file.
+#
+# Usage: bash ffmpeg/basic/concat.sh <input video 1> <input video 2> <output video>
+#
+#####################################################
+
+INPUT_1=`realpath "${1}"`
+INPUT_2=`realpath "${2}"`
+OUTPUT="${3}"
+
+# Check if output file extension is .mov
+if [[ "${OUTPUT}" != *".mov" ]]; then
+	echo "Please use an .mov extension on your output file argument"
+	exit 2
+fi
+
+echo "file '${INPUT_1}'" > videos.txt
+echo "file '${INPUT_2}'" >> videos.txt
+
+ffmpeg -f concat \
+	-safe 0 \
+	-i videos.txt \
+	-c:v prores_ks \
+	-profile:v 3 \
+	-c:a aac \
+	"${OUTPUT}"
+
+# cleanup file list
+rm -f videos.txt