Merge pull request #2589 from invigorzz313/videoreverse

video reversing

Author: avinashkranjan

Video reversing/ReadMe.md

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+# Video reversing
+This python script will allow us to reverse a video  
+
+## Setup Instructions
+### Install python3
+sudo apt-get install python3
+### Install pip (package installer for python)
+sudo apt-get install python3-pip
+### Install OpenCV library with pip
+pip3 install opencv-python
+### Install tkinter library
+sudo apt-get install python3-tk
+
+## Details/Output
+The input video is to be stored in the current folder.  
+When the script is run, the progress is updated every 100 frames.  
+The output reversed video is saved in the current folder.  
+
+## Author
+Github: invigorzz313

Video reversing/sampleOutput.mp4

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+import cv2
+import tkinter as tk
+from tkinter.filedialog import *
+
+window = tk.Tk()
+window.title("Video reversing")
+window.geometry('400x200')
+label = tk.Label(window, text="Input video file should be in the current folder").grid(row=0, column=0)
+label = tk.Label(window, text="Output/reversed video file is saved in the current folder").grid(row=1, column=0)
+label = tk.Label(window, text="Close this dialog box to proceed").grid(row=3, column=0)
+window.mainloop()
+
+
+cap = cv2.VideoCapture('sampleVideo.mp4')
+
+frames = cap.get(cv2.CAP_PROP_FRAME_COUNT)
+fps = cap.get(cv2.CAP_PROP_FPS)
+
+height = cap.get(cv2.CAP_PROP_FRAME_HEIGHT)
+width = cap.get(cv2.CAP_PROP_FRAME_WIDTH)
+size = (int(width*0.5), int(height*0.5))
+
+# defining/writing the output video and its format
+fourcc = cv2.VideoWriter_fourcc(*'mp4v')
+out = cv2.VideoWriter('sampleOutput.mp4', fourcc, fps, size)
+
+print("No. of frames: ", frames)
+print("FPS: ", fps)
+
+frameIdx = frames - 1 
+if(cap.isOpened()):
+    # printing the progress
+    print("Progress:\n")
+    while(frameIdx!=0): # iterating from last frame to first
+        cap.set(cv2.CAP_PROP_POS_FRAMES, frameIdx) # pointing to last frame
+        ret, frame = cap.read() 
+        frame = cv2.resize(frame, size)
+        frameIdx = frameIdx - 1
+        if(frameIdx%100 == 0): # progress updated every 100 frames
+            print(frameIdx)
+        out.write(frame)
+    
+out.release()
+cap.release()
+cv2.destroyAllWindows()