Python - Extracting and Saving Video Frames

Question

So I ve followed this tutorial but it doesn t seem to do anything  Simply nothing  It waits a few seconds and closes the program  What is wrong with this code    import cv2 vidcap   cv2 VideoCapture  Compton mp4   success image   vidcap read   count   0 success   True while success    success image   vidcap read     cv2 imwrite  frame d jpg    count  image        save frame as JPEG file   if cv2 waitKey 10     27                        exit if Escape is hit       break   count    1   Also  in the comments it says that this limits the frames to 1000  Why   EDIT  I tried doing success   True first but that didn t help  It only created one image that was 0 bytes

User · Answer

The previous answers have lost the first frame. And it will be nice to store the images in a folder.

# create a folder to store extracted images
import os
folder = 'test'  
os.mkdir(folder)
# use opencv to do the job
import cv2
print(cv2.__version__)  # my version is 3.1.0
vidcap = cv2.VideoCapture('test_video.mp4')
count = 0
while True:
    success,image = vidcap.read()
    if not success:
        break
    cv2.imwrite(os.path.join(folder,"frame{:d}.jpg".format(count)), image)     # save frame as JPEG file
    count += 1
print("{} images are extacted in {}.".format(count,folder))

By the way, you can check the frame rate by VLC. Go to windows -> media information -> codec details

User · Answer

Following script will extract frames every half a second of all videos in folder   Works on python 3 7  import cv2 import os listing   os listdir r D  Images AllVideos   count 1 for vid in listing      vid   r quot D  Images AllVideos  quot  vid     vidcap   cv2 VideoCapture vid      def getFrame sec           vidcap set cv2 CAP PROP POS MSEC sec 1000          hasFrames image   vidcap read           if hasFrames              cv2 imwrite  quot D  Images Frames image quot  str count   quot  jpg quot   image    Save frame as JPG file         return hasFrames     sec   0     frameRate   0 5   Change this number to 1 for each 1 second          success   getFrame sec      while success          count   count   1         sec   sec   frameRate         sec   round sec  2          success   getFrame sec

User · Answer

This is a tweak from previous answer for python 3 x from  GShocked  I would post it to the comment  but dont have enough reputation  import sys import argparse  import cv2 print cv2   version     def extractImages pathIn  pathOut       vidcap   cv2 VideoCapture pathIn      success image   vidcap read       count   0     success   True     while success        success image   vidcap read         print   Read a new frame     success        cv2 imwrite  pathOut      frame d jpg    count  image        save frame as JPEG file       count    1  if   name       main         print  aba       a   argparse ArgumentParser       a add argument  --pathIn   help  path to video       a add argument  --pathOut   help  path to images       args   a parse args       print args      extractImages args pathIn  args pathOut

User · Answer

I am using Python via Anaconda s Spyder software  Using the original code listed in the question of this thread by  Gshocked  the code does not work  the python won t read the mp4 file   So I downloaded OpenCV 3 2 and copied  opencv ffmpeg320 dll  and  opencv ffmpeg320 64 dll  from the  bin  folder  I pasted both of these dll files to Anaconda s  Dlls  folder    Anaconda also has a  pckgs  folder   I copied and pasted the entire  OpenCV 3 2  folder that I downloaded to the Anaconda  pckgs  folder    Finally  Anaconda has a  Library  folder which has a  bin  subfolder  I pasted the  opencv ffmpeg320 dll  and  opencv ffmpeg320 64 dll  files to that folder   After closing and restarting Spyder  the code worked  I m not sure which of the three methods worked  and I m too lazy to go back and figure it out  But it works so  cheers

User · Answer

After a lot of research on how to convert frames to video I have created this function hope this helps  We require opencv for this    import cv2 import numpy as np import os  def frames to video inputpath outputpath fps      image array         files    f for f in os listdir inputpath  if isfile join inputpath  f       files sort key   lambda x  int x 5 -4       for i in range len files           img   cv2 imread inputpath   files i          size     img shape 1  img shape 0          img   cv2 resize img size         image array append img     fourcc   cv2 VideoWriter fourcc  D    I    V    X      out   cv2 VideoWriter outputpath fourcc  fps  size     for i in range len image array           out write image array i      out release     inputpath    folder path  outpath     video file path video mp4  fps   29 frames to video inputpath outpath fps    change the value of fps frames per second  input folder path and output folder path according to your own local locations

User · Answer

To extend on this question   amp  answer by  user2700065  for a slightly different cases  if anyone does not want to extract every frame but wants to extract frame every one second  So a 1-minute video will give 60 frames images    import sys import argparse  import cv2 print cv2   version     def extractImages pathIn  pathOut       count   0     vidcap   cv2 VideoCapture pathIn      success image   vidcap read       success   True     while success          vidcap set cv2 CAP PROP POS MSEC  count 1000        added this line          success image   vidcap read           print   Read a new frame     success          cv2 imwrite  pathOut      frame d jpg    count  image        save frame as JPEG file         count   count   1  if   name       main         a   argparse ArgumentParser       a add argument  --pathIn   help  path to video       a add argument  --pathOut   help  path to images       args   a parse args       print args      extractImages args pathIn  args pathOut

User · Answer

This function extracts images from video with 1 fps  IN ADDITION it identifies the last frame and stops reading also   import cv2 import numpy as np  def extract image one fps video source path        vidcap   cv2 VideoCapture video source path      count   0     success   True     while success        vidcap set cv2 CAP PROP POS MSEC  count 1000               success image   vidcap read             Stop when last frame is identified       image last   cv2 imread  frame   png  format count-1         if np array equal image image last             break        cv2 imwrite  frame d png    count  image        save frame as PNG file       print     sec reading a new frame       format count success        count    1

User · Answer

This code  extract frames from the video and save the frames in  jpg formate   import cv2 import numpy as np import os    set video file path of input video with name and extension vid   cv2 VideoCapture  VideoPath     if not os path exists  images        os makedirs  images     for frame identity index   0 while True         Extract images     ret  frame   vid read         end of frames     if not ret           break       Saves images     name      images frame    str index      jpg      print   Creating       name      cv2 imwrite name  frame         next frame     index    1

User · Answer

This is Function which will convert most of the video formats to number of frames there are in the video  It works on Python3 with OpenCV 3   import cv2 import time import os  def video to frames input loc  output loc          Function to extract frames from input video file     and save them as separate frames in an output directory      Args          input loc  Input video file          output loc  Output directory to save the frames      Returns          None             try          os mkdir output loc      except OSError          pass       Log the time     time start   time time         Start capturing the feed     cap   cv2 VideoCapture input loc        Find the number of frames     video length   int cap get cv2 CAP PROP FRAME COUNT   - 1     print   Number of frames     video length      count   0     print   Converting video   n         Start converting the video     while cap isOpened              Extract the frame         ret  frame   cap read             Write the results back to output location          cv2 imwrite output loc       05d jpg     count 1   frame          count   count   1           If there are no more frames left         if  count  gt   video length-1                  Log the time again             time end   time time                 Release the feed             cap release                 Print stats             print   Done extracting frames  n d frames extracted    count              print   It took  d seconds forconversion      time end-time start               break  if   name       main          input loc     path to video 00009 MTS      output loc     path to output frames       video to frames input loc  output loc    It supports  mts and normal files like  mp4 and  avi  Tried and Tested on  mts files  Works like a Charm

User · Answer

From here download this video so we have the same video file for the test  Make sure to have that mp4 file in the same directory of your python code  Then also make sure to run the python interpreter from the same directory   Then modify the code  ditch waitKey that s wasting time also without a window it cannot capture the keyboard events  Also we print the success value to make sure it s reading the frames successfully   import cv2 vidcap   cv2 VideoCapture  big buck bunny 720p 5mb mp4   success image   vidcap read   count   0 while success    cv2 imwrite  frame d jpg    count  image        save frame as JPEG file         success image   vidcap read     print  Read a new frame     success    count    1   How does that go

[python] Python - Extracting and Saving Video Frames

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