"resolution" and "framerate" parameters are ignored by VideoStream when using webcam source

[xoxota99]

According to https://github.com/jrosebr1/imutils/blob/master/imutils/video/videostream.py , the constructor arguments for resolution and fps are only used if the PI Camera is the source for the the videostream. Is this intentional?

[jrosebr1]

Yes. If you are using a cv2.VideoCapture then any properties would be need to be set via the .set method of the object.

[jrosebr1]

I'll add that a better implementation of VideoStream would accept a pre-initialized PiVideoStream and cv2.VideoCapture object. This would allow the user to add any customizations to the object that they see fit and then pass it into VideoStream to make it threaded.

However, this class must be kept backwards compatible as many other implementations rely on it, as do all (current) articles on the PyImageSearch blog.

Another option would be to have a stream parameter to the constructor which is a pre-instantiated PiVideoStream or WebcamVideoStream.

Checking the type of the src object would fix it, but the VideoStream class in particular would need an overhaul.

[xoxota99]

Feature request, then? Or "Won't Fix"?

[jrosebr1]

It's a feature request but it needs to be carefully done to ensure backwards compatibility.

[Momilijaz96]

So in conclusion how can we achieve a faster frame rate with videostream?

[jrosebr1]

@Momilijaz96 This PR, which I'll merge in next week, will allow for arbitrary cv2.VideoCapture parameters to be set within VideoStream.