There are tons of videos in the web that depend on the fdk-aac gst plugin to correctly play audio (see https://bugs.webkit.org/show_bug.cgi?id=201399). However the libfdk-aac-dev is not listed in the install-dependencies script so the gst plugin won't be built in most of the cases.
Created attachment 382903 [details]
Comment on attachment 382903 [details]
Clearing flags on attachment: 382903
Committed r252135: <https://trac.webkit.org/changeset/252135>
All reviewed patches have been landed. Closing bug.