Audio and video sync issue

[kg1980]

When downloading audio and video separately, as suggested here:
https://stackoverflow.com/questions/72965406/no-sound-in-video-downloaded-from-youtube-using-pytube

I noticed that there is a small time difference between the audio and the video lenghts.
For example, for this video:
https://www.youtube.com/watch?v=-WDjGekVtYg
The video duration is 823.97 seconds, while the audio buffer length is 824.08 seconds.

When downloading the same video in different tool, I noticed a difference of about 2240 samples between the audio signals, see figure below: