python opencv videowrite不写视频 [英] python opencv videowrite doesn't write video
问题描述
我刚刚开始使用opencv编程python. 我使用了来自opencv 3.0.0教程的以下页面
I just started programming python with opencv. I used the following page from opencv 3.0.0 tutorial
当我尝试使用保存视频的示例时，它不起作用. 它显示网络摄像头中的内容，并创建一个名为output.avi的文件，但是当我检查ouput.avi的大小时，它为零字节. 我还尝试使用其他编解码器，例如YUY2
When I tried to use the example that saves videos, it doesn't work. It displays the content from the webcam, and also creates a file called output.avi, but when I checked the size of ouput.avi, it was zero bytes. I also tried using different codecs, like YUY2
我使用python 2.7.8和opencv 3.0.0 和Windows 8.1
I use python 2.7.8 and opencv 3.0.0 and windows 8.1
推荐答案
我遇到了同样的问题，我通过将视频输出分辨率指定为与输入完全相同来解决了这个问题:
I had the same problem and i solved it by specifying the video output resolution to exactly the same as input:
cap = cv2.VideoCapture('vtest.avi')
...
out = cv2.VideoWriter('output.avi',fourcc, 20.0,(int(cap.get(3)),int(cap.get(4))))
当然，请确保您已安装ffmpeg并且可以正常工作.
Of course make sure you got ffmpeg installed and working.
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