CODEWITHSUNDEEP
video-captureopencvpython
lianshuailong
lianshuailong

Reputation: 147

TypeError: VideoWriter() missing required argument 'frameSize' (pos 5) with opencv-python ==4.4.0.42

I want to create VideoWriter with the following code:

  fourcc = cv2.VideoWriter_fourcc(*'mp4v')

  video_writer = cv2.VideoWriter('out.mp4',fourcc,fps,(frame_width,frame_height))

but i get the error:

   TypeError: VideoWriter() missing required argument 'frameSize' (pos 5)

when i change my code to:

   fourcc = cv2.VideoWriter_fourcc(*'mp4v')

   video_writer = cv2.VideoWriter(filename='out.mp4',fourcc=fourcc,fps=fps,frameSize=(frame_width,frame_height))

i get another error:

   TypeError: VideoWriter() missing required argument 'apiPreference' (pos 2)

so i change my code to :

   fourcc = cv2.VideoWriter_fourcc(*'mp4v')

   video_writer = cv2.VideoWriter(filename='out.mp4',apiPreference=0,fourcc=fourcc,fps=fps,frameSize=(frame_width,frame_height))

i get error:

   TypeError: VideoWriter() missing required argument 'params' (pos 6)

How could i solve it? Could anyone tell me how to use the api:VideoWriter()?Thanks a lot

Upvotes: 6

Views: 10709

Answers (3)

Coloss
Coloss

Reputation: 45

I had the same problem. Turns out I was passing a pathlib.Path instead of a string for the filename. Converting to string helped. Seems openCV is not very good with reporting that it received the wrong types. So make sure you check all types of the arguments you are passing.

Upvotes: 0

Rahul Chauhan
Rahul Chauhan

Reputation: 135

fourcc = cv2.VideoWriter_fourcc(*'DIVX')
out = cv2.VideoWriter(path,apiPreference = 0,fourcc = fourcc, fps = 30,frameSize = (256,256) )
 
for i in range(len(predictions)):
    out.write((img_as_ubyte(predictions[i])))
out.release()

it did worked for me used skimage's image_as_ubyte to convert float to int.

Upvotes: 1

lianshuailong
lianshuailong

Reputation: 147

ok, the following code works for me :

frame_num = int(Cap.get(cv2.CAP_PROP_FRAME_COUNT))
frame_width = int(Cap.get(cv2.CAP_PROP_FRAME_WIDTH))
frame_height = int(Cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
fourcc = cv2.VideoWriter_fourcc(*'mp4v')
video_writer = cv2.VideoWriter(result,fourcc,fps,(frame_width,frame_height))

the type of Cap.get(cv2.*) is float, so i change it to integer

Upvotes: 5

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