Python OpenCv: How to Write text on video? output .mp4 empty-CodePudding

I would like to insert a text in a video dynamically. When I run the code below it displays a window with the text inside the video, but the .mp4 output generated file is empty (0kb)

EDIT: problem persists after right indentation

path = r'C:\\Users\\semnome\\Desktop\\automatizacoes\\m\\'
video_file = 'a.mp4'
x = True
cap = cv.VideoCapture(video_file) #cap for "Video Capture Object"
fourcc = cv.VideoWriter_fourcc(*'mp4v')
out = cv.VideoWriter('outpu2t.mp4', fourcc, 20.0, (640,480))
try:
    while(True):
    
        # Capture frames in the video
        ret, frame = cap.read()

        font = cv.FONT_HERSHEY_SIMPLEX
        
        cv.putText(frame,
                    'TEXT ON VIDEO',
                    (50, 50),
                    font, 1,
                    (0, 640, 480),
                    2,
                    cv.LINE_4)
        out.write(frame)
        cv.imshow('video', frame)
        
        if cv.waitKey(1) & 0xFF == ord('q'):
            break

    
    cap.release()
    

    cv.destroyAllWindows()
except:
    print("Video has ended.")
cap.release()
cv.destroyAllWindows()

CodePudding user response：

this is simply an indentation error. (and it's got nothing to do with writing text !)

you want out.write(frame) inside the loop, not after it (currently it only writes a single frame)