On Tue, 15 Sep 2020 14:06:11 +0200 Tobias Geerinckx-Rice via Bug reports for GNU Guix <bug-guix@gnu.org> wrote:
> Hi Nathan, > > Nathan Dehnel 写道： > > bash-5.0$ youtube-dl -x > > https://www.youtube.com/watch?v=7Ijd_iN9Blk > > [youtube] 7Ijd_iN9Blk: Downloading webpage > > [download] Deadmau5 - Hit Save-7Ijd_iN9Blk.webm has already been > > downloaded > > [download] 100% of 15.45MiB > > ERROR: ffprobe/avprobe and ffmpeg/avconv not found. Please > > install one. > > It works fine without ‘-x’: > > λ youtube-dl https://www.youtube.com/watch?v=7Ijd_iN9Blk > [youtube] 7Ijd_iN9Blk: Downloading webpage > [download] Destination: Deadmau5 - Hit Save-7Ijd_iN9Blk.mp4 > [download] 100% of 37.09MiB in 00:02 > > This *is* functioning correctly in my view: that advanced options > optionally require run-time dependencies is not a bug but a > feature. The programme clearly explains which package could be > installed to continue, and the user can chose which one they > prefer - including neither, which suffices for the majority of > youtube-dling. > > Matters would be different if the error message were less clear, > or perhaps if ffmpeg weren't so insanely great: > > λ guix size youtube-dl | tail -n1 > total: 186.9 MiB > λ guix size youtube-dl ffmpeg | tail -n1 > total: 811.2 MiB > > (!) > > Kind regards, > > T G-R Maybe it's time we added an "optional dependencies" field? There seems to be a bug report or help request like every week that just boils down to "this package has an undocumented dependency".
