Hi,
I had a fully upgraded system.

The solution was to run 'youtube-dl --all-formats --get-filename URL'. The output was something like 'filename-XY.flv \\ filename-XY.mp4'. After that, I could run 'youtube-dl -f XY URL', and the warning disappeared. However, the download still took a lot of time. Cclive is much faster, by running 'cclive -p mp4 URL'.

Cheers

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