python讀取mp4視訊_如何讀取由scikit圖像處理的mp4視訊？

Imageiopython包應該做您想要的事情。下面是使用此包的python片段：import pylab

import imageio

filename = '/tmp/file.mp4'

vid = imageio.get_reader(filename, 'ffmpeg')

nums = [10, 287]

for num in nums:

image = vid.get_data(num)

fig = pylab.figure()

fig.suptitle('image #{}'.format(num), fontsize=20)

pylab.imshow(image)

pylab.show()

for i, im in enumerate(vid):

print('Mean of frame %i is %1.1f' % (i, im.mean()))

要安裝imageio，可以使用pip：pip install imageio

另一個解決方案是使用moviepy(它使用類似的代碼來讀取視訊)，但我認為imageio更輕，可以完成任務。

對第一條評論的響應

為了檢查整個檔案的标稱幀速率是否相同，可以在疊代器中計算幀數：count = 0

try:

for _ in vid:

count += 1

except RuntimeError:

print('something went wront in iterating, maybee wrong fps number')

finally:

print('number of frames counted {}, number of frames in metada {}'.format(count, vid.get_meta_data()['nframes']))

In [10]: something went wront in iterating, maybee wrong fps number

number of frames counted 454, number of frames in metada 461

為了顯示每個幀的時間戳：try:

for num, image in enumerate(vid.iter_data()):

if num % int(vid._meta['fps']):

continue

else:

fig = pylab.figure()

pylab.imshow(image)

timestamp = float(num)/ vid.get_meta_data()['fps']

print(timestamp)

fig.suptitle('image #{}, timestamp={}'.format(num, timestamp), fontsize=20)

pylab.show()

except RuntimeError:

print('something went wrong')