Reverses a video

reverse_video.sh

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+#!/bin/bash
+
+#######################
+#Check for requirments#
+#######################
+zenity=$(which zenity)
+if [ "$zenity" == "" ]; then
+    echo "You must have zenity installed"
+    exit 1
+fi
+#avconv=$(which avconv)
+#if [ "$avconv" == ""]; then
+#    zenity --error --text="You must have avconv installed"
+#    exit 1 
+#fi
+
+avconv=$(which avconv)
+if [ "$avconv" == "" ]; then
+    echo "You must have avconv installed"
+    exit 1
+fi
+##################################
+#Spawn frames into images/ folder#
+##################################
+mkdir images
+cd images
+#avconv -i ../$1 %d.jpg
+avconv -i ../$1 %d.jpg
+
+##############
+#Count images#
+##############
+images=0
+
+for i in $(ls | grep .jpg); do
+    let images=images+1
+done
+#####################################
+#Rename images in the opposite order#
+#####################################
+i=1
+factor=0
+while [ $factor -lt $images ]; do
+    new_name=$((images-factor))
+    echo $new_name
+    mv $i.jpg image$new_name.jpg
+    let factor=factor+1
+    let i=i+1
+done
+###############################################
+#Finally convert newly named images into video#
+###############################################
+#avconv -f image2 -i image%d.jpg -vcodec mpeg4 ../$2
+avconv -f image2 -i image%d.jpg -vcodec mpeg4 ../$2
+
+
+#######################
+#Remove temporal files#
+#######################
+rm *.jpg