How to run encoding using multiple cores?

[kundanshrivastava]

Overview

Unable to run PyAV container encoding on multiple CPU's

Expected behavior

by adding flags:
self.stream.thread_count = 4
self.stream.thread_type = 3
Its should work on 4 thread but i don't see that is working as performance not improved at all

Actual behavior

Encoding should start working on multicore passed by self.stream.thread_count = 4 and self.stream.thread_type = 3 arguments.

Research

I have done the following:
Inside _init():
self.container = av.open(path, mode="w")
self.stream = self.container.add_stream("h264", rate=round(frame_rate))
self.stream.pix_fmt = "yuv420p"
self.stream.thread_count = 4
self.stream.thread_type = 3
self.stream.bit_rate = bit_rate

Adding data to container:
#type of src is numpy array
frame = av.VideoFrame.from_ndarray(src, format="rgba")
self.container.mux(self.stream.encode(frame))

Additional context

I am writing the webm video form numpy array data and its working fine but its too slow, therefor exploring the multi core option