[gentoo-user] firefox-bin:esr-140.4.0(also firefox-bin:rapid-144.0) could not find appropriate html5-video-player in some website(bilibili.com) after ffmpeg-8.0 updated.

[essensea]

As title says, it works perfect before ffmpeg updated. And I also file a
bug in bugs.gentoo.org.
The idea of this mail is how to get more information about this bug,
besides of ffmpeg's building log.