added a ffmpeg script for creating prores 4444 videos

bash/make_pr4444.sh

@@ -0,0 +1,3 @@
+for i;
+	do ffmpeg -i "$i" -f mov -c:v prores_ks -profile:v 4444 -pix_fmt yuva444p10le -strict -2 -vendor ap10 "${i%.*}_pr4444.mov" ;
+done;