https://bugs.webkit.org/show_bug.cgi?id=259357 removed the configuration of the "immediate-output" property for westeros sink, but it's still needed for mediastream content. See: https://github.com/WebPlatformForEmbedded/WPEWebKit/pull/1136
Pull request: https://github.com/WebKit/WebKit/pull/16479
Committed 266720@main (4861f4a2898f): <https://commits.webkit.org/266720@main> Reviewed commits have been landed. Closing PR #16479 and removing active labels.
<rdar://problem/113620574>