Update attribution and modify the export script to not work if file is not provided and is not found.

README.md

@@ -4,6 +4,8 @@ Scripts and templates for making "filmless", cameraless analog films using free
 
 Building off of the [v2f](https://github.com/sixteenmillimeter/v2f) application for generating film-sized strips of images, this is a set of tools for building pixel-perfect image sequences for printing and laser cutting into viable 16mm film strips. Create 16mm films from non-film materials and convert video to strips of film using [Processing](https://processing.org/).
 
+This project was made in collaboration with [Wenhua Shi](https://shiwenhua.net/) for a workshop run during the [Revolutions Per Minute Festival](https://revolutionsperminutefest.org/) held at UMass Boston.
+
 ### [Download](https://github.com/sixteenmillimeter/filmless/archive/master.zip)
 
 ## What this repository contains

scripts/export.sh

@@ -1,6 +1,12 @@
 #!/bin/bash
 
-WITH_SOUND=true		#change to false for a silent film
+if [[ "${1}" == "" ]]; then
+   echo "Please include path to video file as first argument"
+   exit 1
+fi
+
+
+WITH_SOUND=false		#change to false for a silent film
 
 #changes based on printer DPI, this is for 1440
 #check the output of the calibration script
@@ -11,6 +17,11 @@ AUDIO_RATE=10368
 #or hardcode it by changing VIDEO=${1} to VIDEO=/path/to/my/video.mov
 VIDEO="${1}"
 
+if [ ! -f "${VIDEO}" ]; then
+    echo "Video file ${VIDEO} does not exist, exiting script..."
+    exit 2 
+fi
+
 # change these to directory where you will store your frames and audio
 FRAMES_DIR=~/Desktop/frames/
 AUDIO_DIR=~/Desktop/audio/