Why, after uploading a music video to YouTube, does the sound and image get out of sync?

Question

YouTube

when you just look from the camera and from the computer everything is fine.

Answer 1

Most likely, the problem was in the incorrect "packing" of audio and video into the AVI container - which was normally read by local players, but the YouTube scripts choked with optimized conversion and out of sync appeared.
The message [avi @ 000000000043f780] non-interleaved AVImeans that the entire video is recorded separately in one piece in the AVI file, then all the audio is recorded in a separate continuous piece. And it was thought that they would often alternate, and the player, having read a piece into the buffer, could play the video and the corresponding audio at once.
Local conversion with ffmpeg helped:

ffmpeg -i 01.avi -c:v libx264 -c:a aac 01_youtube.mp4