A question of ytarchive

I tried to use ytarchive to record several live stream(because it was a test, I did not record the entire stream, but manually stopped the recording after recording for a while. The recorded files were about half an hour) but I found that after recording The file will freeze after a certain time point (about the last ten minutes or so) and only the sound will remain. I wanna know why this happens.

(I am not an English speaker, please forgive me for any mistakes in the content)