To watch a livestream, I use
yt-dlp -o - <YouTube_URL> | vlc -
and to interrupt it, I type Ctrl-C. While Ctrl-C always kills vlc,
yt-dlp is sometimes still running. I get a message
Last message repeated 73 times
where the above number increases, until I type Ctrl-C a second time,
which gives:
^C[ffmpeg] Interrupted by userimes
[download] 100% in 01:37:30
Here, the text "imes" after "Interrupted by user" comes from the above
"Last message repeated 73 times" message, which hasn't been cleared.
This message comes from /usr/lib/x86_64-linux-gnu/libavutil.so.60