Python/Open CV：從cos圖像序列創建視頻，視頻爲空

Question

我試圖從我創建的cos圖像創建視頻，但是我製作的avi視頻爲空。我不得不使用cv2.VideoWriter（）。通過創建的視頻正確顯示幀是0字節。你知道如何解決這個問題嗎？

如果我從avi視頻中獲得一個幀，然後我創建了一個新的可播放視頻。

預先感謝您！

我的代碼是

import cv2 
import math 
import numpy as np 

N=128 
Icos_1 = np.zeros((N,N)) 
Icos_2 = np.zeros((N,N)) 
for i in range(0,N): 
    for j in range(0,N): 
     myPi = 2*math.pi/N 
     th1 = 1*i + 3*j 
     th2 = 2*i + 4*j 
     Icos_1[i,j] = 255*(math.cos(myPi*th1)) 
     Icos_2[i,j] = 255*(math.cos(myPi*th2)) 
fourcc = cv2.VideoWriter_fourcc(*'XVID') 
out = cv2.VideoWriter('sample_video.avi',fourcc, 25.0, (128,128)) 

or x in range(1, 100): 
    if (x % 2) != 0: 
     frame = Icos_1 
    else: 
     frame = Icos_2 

    out.write(np.uint8(frame)) 
    cv2.imshow('frame',np.uint8(frame)) 
    if cv2.waitKey(1) & 0xFF == ord('q'): 
     break 

# Release video objects if job is finished 
out.release() 

Answer 1

我找到了解決辦法！

我在out = cv2.VideoWriter('sample_video.avi',0, 25.0, (128,128))

完整的代碼使用0作爲編解碼器：

import cv2 
import math 
import numpy as np 

N=128 
Icos_1 = np.zeros((N,N)) 
Icos_2 = np.zeros((N,N)) 
for i in range(0,N): 
    for j in range(0,N): 
     myPi = 2*math.pi/N 
     th1 = 1*i + 3*j 
     th2 = 2*i + 4*j 
     Icos_1[i,j] = 255*(math.cos(myPi*th1)) 
     Icos_2[i,j] = 255*(math.cos(myPi*th2)) 

out = cv2.VideoWriter('sample_video.avi',0, 25.0, (128,128)) 

or x in range(1, 100): 
    if (x % 2) != 0: 
     frame = Icos_1 
    else: 
     frame = Icos_2 

    out.write(np.uint8(frame)) 
    cv2.imshow('frame',np.uint8(frame)) 
    if cv2.waitKey(1) & 0xFF == ord('q'): 
     break 

# Release video objects if job is finished 
out.release() 

如果你使用`np.uint8（框架）`你爲什麼不使用在屏幕上顯示，然後