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I want to be able to write out a color raster for each video from in python. However, when I pass a 3d array to video writer, it generates a bad output. What am I doing wrong?

Sampled code below....

 h,w = raster.shape
cmap = hot()
writer = cv2.VideoWriter('output.avi', cv2.VideoWriter_fourcc('P','I','M','1'), 25, (h,w), True)    
for i in range(len(images)):
    x = np.transpose((dsp.normalize(images[i]**(0.5))*255).astype('uint8'))
    x  = (cmap(x)*255).astype('uint8')
    for k in range(25):
        writer.write(x)  
del writer

I want to be able to write out a color raster for each video from in python. However, when I pass a 3d array to video writer, it generates a bad output. What am I doing wrong?

Sampled code below....

 h,w = raster.shape
cmap = hot()
writer = cv2.VideoWriter('output.avi', cv2.VideoWriter_fourcc('P','I','M','1'), 25, (h,w), True)    
for i in range(len(images)):
    x = np.transpose((dsp.normalize(images[i]**(0.5))*255).astype('uint8'))
    x  = (cmap(x)*255).astype('uint8')
    for k in range(25):
        writer.write(x)  
del writer

import cv2
import numpy as np
x = np.random.randint(0,255,(100,100)).astype('uint8')
writer = cv2.VideoWriter('output.avi', cv2.VideoWriter_fourcc('P','I','M','1'), 25, (100,100), True)
for k in range(100):
  writer.write(x)
del writer

I want to be able to write out a color raster for each video from in python. However, when I pass a 3d array to video writer, it generates a bad output. What am I doing wrong?

Sampled code below....

 h,w = raster.shape
cmap = hot()
writer = cv2.VideoWriter('output.avi', cv2.VideoWriter_fourcc('P','I','M','1'), 25, (h,w), True)    
for i in range(len(images)):
    x = np.transpose((dsp.normalize(images[i]**(0.5))*255).astype('uint8'))
    x  = (cmap(x)*255).astype('uint8')
    for k in range(25):
        writer.write(x)  
del writer

EDIT 1: Here is a simplier, stand alone version of the problem. This hangs VLC.

import cv2
import numpy as np
x = np.random.randint(0,255,(100,100)).astype('uint8')
np.random.randint(0,255,(100,100,3)).astype('uint8')
writer = cv2.VideoWriter('output.avi', cv2.VideoWriter_fourcc('P','I','M','1'), 25, (100,100), True)
for k in range(100):
  writer.write(x)
del writer