Problem with stream_video

Hi, I’m actually trying to run this exemple code : " Post-processing a recorded video" which can be found on Olympe documentation at : User guide - Olympe 1.8.0 documentation

But I got a error : 2021-09-10 11:34:47,571 [ERROR] olympe.pdraw - _unregister_future - Failed to unregister future ‘<Future at 0x7f7e46241d68 state=finished returned bool>’

Did somebody have an Idea about that ?
Thank’s for your answer,

Kind regards

what’s your linux config ?

that is my linux config, is it impossible for me to do that ?