musics--- via Bug reports for GNU Guix 写道：
> What should I do now? Install this plugin from the source?

If you're OK with using patent-encumbered codex like MP4 simply:

  $ guix install gst-libav

if that doesn't fix your troubles:

  $ guix install gst-plugins-bad

(You won't need both.)

Kind regards,

T G-R