Two six-digit numbers got outputted randomly

[ShockedCoder]

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Question

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I was downloading some music and yt-dl out putted this:

[1] 523123
[2] 523124

Are these magic numbers or are these error numbers?

The input and output:

void@thevoid:~/Desktop/Muzik$ audio -o "The Living Tombstone - What I Want.%(ext)s" https://www.youtube.com/watch?v=Bhaot-BchF8&list=TLPQMDUxMDIwMjA1qSoztYyoXA&index=3
[1] 523123
[2] 523124
void@thevoid:~/Desktop/Muzik$ [youtube] Bhaot-BchF8: Downloading webpage
[youtube] Downloading just video Bhaot-BchF8 because of --no-playlist
[youtube] Bhaot-BchF8: Downloading embed webpage
[download] Destination: The Living Tombstone - What I Want.webm
[download] 100% of 3.11MiB in 00:00
[ffmpeg] Destination: The Living Tombstone - What I Want.mp3
Deleting original file The Living Tombstone - What I Want.webm (pass -k to keep)

[s104346]

https://github.com/ytdl-org/youtube-dl#video-url-contains-an-ampersand-and-im-getting-some-strange-output-1-2839-or-v-is-not-recognized-as-an-internal-or-external-command