Installed opencv from PIP (python 3.8) and just cant write any video properly.
Using this general constructor pattern:
```writer = cv.VideoWriter('myvideo.avi',cv.VideoWriter_fourcc('m','j','p','g'),25,(h,w))```
And trying many different codecs (divx, mp4v, avc1...) - none of them works.
Just getting an unreadable file 'myvideo.avi' that weights just a few KB.
The irony is that if I write the video using opencv c++ code (been using [this example](https://github.com/opencv/opencv/blob/b39cd06249213220e802bb64260727711d9fc98c/samples/cpp/videowriter_basic.cpp)), it works perfect.
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