Video understanding basics in Prompt Engineering / GenAI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to load a video file using OpenCV.

Prompt Engineering / GenAI

import cv2
video = cv2.VideoCapture([1])

Drag options to blanks, or click blank then click option'

Avideo.mp4

B'video.mp4'

Copen('video.mp4')

Dcv2.VideoCapture('video.mp4')

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put the filename in quotes.

Passing the filename without quotes causing a NameError.

The cv2.VideoCapture function expects a string filename, so the filename must be in quotes.

2fill in blank

medium

Complete the code to read a frame from the video.

Prompt Engineering / GenAI

ret, frame = video.[1]()

Drag options to blanks, or click blank then click option'

Acapture

Bread_frame

Cread

Dget_frame

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent methods like get_frame or capture.

Confusing method names with other libraries.

The correct method to read a frame from a VideoCapture object is read().

3fill in blank

hard

Fix the error in the code to convert a frame to grayscale.

Prompt Engineering / GenAI

gray = cv2.cvtColor(frame, [1])

Drag options to blanks, or click blank then click option'

Acv2.COLOR_GRAY2BGR

Bcv2.COLOR_RGB2GRAY

Ccv2.COLOR_BGR2RGB

Dcv2.COLOR_BGR2GRAY

Attempts:

3 left

💡 Hint

Common Mistakes

Using COLOR_RGB2GRAY which is incorrect for OpenCV frames.

Using COLOR_GRAY2BGR which converts grayscale to color.

Frames from OpenCV are in BGR format, so to convert to grayscale use COLOR_BGR2GRAY.

4fill in blank

hard

Fill both blanks to create a dictionary of frame indices and their grayscale frames for frames with index less than 5.

Prompt Engineering / GenAI

frames_dict = {i: [1] for i, frame in enumerate(frames) if i [2] 5}

Drag options to blanks, or click blank then click option'

Acv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

B<

C<=

Dframe

Attempts:

3 left

💡 Hint

Common Mistakes

Not converting frames to grayscale in the dictionary.

Using wrong comparison operator like <= instead of <.

We convert each frame to grayscale and include frames with index less than 5.

5fill in blank

hard

Fill all three blanks to extract frames, convert to grayscale, and store only frames with brightness above 100.

Prompt Engineering / GenAI

filtered_frames = {i: [1] for i, frame in enumerate(video_frames) if cv2.mean([2])[0] [3] 100}

Drag options to blanks, or click blank then click option'

Acv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

Bframe

C>

Dcv2.cvtColor(frame, cv2.COLOR_RGB2GRAY)

Attempts:

3 left

💡 Hint

Common Mistakes

Using COLOR_RGB2GRAY which is incorrect for OpenCV frames.

Comparing brightness with < instead of >.

Applying cv2.mean on grayscale frame instead of original.

Convert frames to grayscale, check brightness with cv2.mean on original frame, and filter frames with brightness > 100.