Checklist

Describe the problem to be solved
I have little experience with playlists on Peertube.
By default, when I create a playlist it is in "private" mode.
A few days later, I try to share my playlist, I press the "share" button, I get a sharing link.
Except that my playlist is in "private" mode... so if I share this link my friends will see a 404 error.

**Describe the solution you would l

Please add video length on the video thumbnail just like the official Developer app from Apple.

Right now, I can see the length if I click to go to detail screen, but I would have to do it one by one. It would be great to see the length of each video in a glance so that if i have like 15 minutes, I know which one I can watch.

From suggestion here, this should be implemented with audio_ffmpeg_params argument in write_videofile method.

Summa

~/.config/youtube-dlg should just contain configuration files and not logs (which should go to $XDG_DATA_HOME/youtube-dlg/ ) nor youtube-dl binary (which should go to $XDG_CACHE_HOME).

Please also consider using appdirs instead of hardcoding ~/.config/