Several Issues With Capturing A Screen Video With Python

i have already asked a similar question on stackoverflow, but its not the same :-) I have three problems with my code: The framerate is not steady. When i execute the code without

Solution 1:

Alrighty, after looking around for a while, I've gotten these links together. First, this is similar to writing a refresh screen loop in a game. Read this for some of the pitfalls with sleeping. For a better solution, you really want to have your program wait until the kernel updates the display, which should be a kernel event in linux. You'd do this by setting up a event queue with the select library.

The only name I could find for the event queue to monitor was here, with fbdev_evtchn as the channel. This may not apply.

If you find yourself on windows, or can't get notified of screen refreshes, then both the select library and the signal library have real-time timers. Those will give you an accurate wait, and depending on the implementation, should put the program under until the timer runs out.

Solution 2:

The documentation for time.sleep

time.sleep(secs)¶

Suspend execution for the given number of seconds. The argument may be a floating point number to indicate a more precise sleep time. The actual suspension time may be less than that requested because any caught signal will terminate the sleep() following execution of that signal’s catching routine. Also, the suspension time may be longer than requested by an arbitrary amount because of the scheduling of other activity in the system.

time.sleep is not an accurate timing mechanism. It'll usually end up sleeping for longer then you requested. The typical is solution is to sleep for a very short amount of time in a loop until enough time has passed.