OpenCV cap.get(cv2.CAP_PROP_FRAME_COUNT)返回-1 [英] OpenCV cap.get(cv2.CAP_PROP_FRAME_COUNT) returning -1

问题描述

我最近使用以下教程所以我运行以下代码来获取mp4视频的帧数

So I ran the following code to get the number of frames of an mp4 video

   import cv2

   cap = cv2.VideoCapture('vid.mp4')
   length = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))
   print length 

奇怪的是，我得到"-1"作为长度"的输出.视频确实加载了，我得到了准确的值

Strangely I get "-1" as output for "length". The video does infact load and I get accurate values for

   int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))  #480

和

   int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))   #640

所以这很好奇为什么帧计数不起作用.请帮忙.

so its a wonder why frame count doesn't work. Please Help.

推荐答案

问题与opencv构建有关(在c ++中也存在).我最终重新构建了opencv，之后一切正常

The problem was with the opencv build (as it also occured in c++). I ended up re-building my opencv and everything worked fine after

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