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6. Writing video using openCV

Notebook
Video

Notes

cv2.VideoWriter_fourcc(*'XVID') doesn't work for me. I have to use *'avc1' or *'mp4v'

For the two pieces of code below, you need to open the Notebook from a web browser and not from the IDE environment.

mp4 = open("race_car_out_x264.mp4", "rb").read()
data_url = "data:video/mp4;base64," + b64encode(mp4).decode()

HTML(f"""<video width=700 controls><source src="{data_url}" type="video/mp4"></video>""")
video = YouTubeVideo("2Gju7YLfkP0", width=700, height=438)
display(video)

Quiz

  1. VideoWriter in OpenCV is used to:
  • To capture video from a webcam
  • To play video files
  • To write frames to a video file
  • To read frames from a video file
  1. How can you check if cap.read() was successful (Here: cap = cv2.VideoCapture())
  • By checking the value of the isOpened() function.
  • By checking the value of the capOpened() variable
  • By checking the return value of the function cap.read()
  • None of the above
  1. The importance of checking cap.isOpened() in an OpenCV program:
  • It ensures that the video file is opened successfully before reading or writing it.
  • It helps in detecting any errors or issues with the VideoCapture object.
  • Both a and b
  • None of the above
  1. How can you handle errors that may occur when using cap.read()?
  • By checking the return value of the function and handling any errors accordingly.
  • By using a try-except block to catch any exceptions that may be raised.
  • By using the isOpened() function to check if the video capture object is still open before calling cap.read()
  • All of the above
  1. What does fourcc mean in cv2.VideoWriter()?
  • It refers to the four-character code used to specify the codec to be used for video compression
  • It is a parameter to set the frame rate of the output video
  • It is the size of the video frame in pixels
  • It is the file extension of the output video file