I would consider this a fontconfig bug. It's their fault that their
#3310: Missing Font cache messages when using libass? -------------------------------------+------------------------------------- Reporter: DeadSix27 | Owner: Type: defect | Status: new Priority: normal | Component: Version: unspecified | undetermined Keywords: libass | Resolution: Blocking: | Blocked By: Analyzed by developer: 0 | Reproduced by developer: 0 -------------------------------------+------------------------------------- Comment (by DeadSix27): Replying to [comment:6 gjdfgh]: library is unusable on many systems.
Related bug report: https://bugs.freedesktop.org/show_bug.cgi?id=64766
Firts you have to convince the fontconfig devs that there is a problem.
Well, I also asked, if its intended that ffmpeg doesn't tell you anything. E.g "Scanning fonts, please wait" or similiar. -- Ticket URL: <https://trac.ffmpeg.org/ticket/3310#comment:7> FFmpeg <http://ffmpeg.org> FFmpeg issue tracker