Using ADB to capture the screen

I’m trying to get a screenshot of the phone screen as fast as possible. Currently, I am doing:

adb shell screencap -p /sdcard/screencap.png && adb pull /sdcard/screencap.png

However it is too slow and takes up to 3 seconds. Is there any better way to do this? I intend to use this function with an unrooted phone.

Also what are the different arguments I can use for screencap?

Thanks.

EDIT (extra information): I intend to use this method to be able to get a live feed of the screen onto my pc. The current method works however it is too slow. I can’t use adb shell screenrecord because I won’t be able to access the video file while it is being recorded.

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