We do not support disabling of hardware H264 encoder in GPU Process.
Created attachment 414546 [details] Patch
Created attachment 414554 [details] Patch
Created attachment 414555 [details] Patch
Committed r270117: <https://trac.webkit.org/changeset/270117> All reviewed patches have been landed. Closing bug and clearing flags on attachment 414555 [details].
<rdar://problem/71628248>