It's not much maintained anymore and prone to rendering issues. In the mid-term we will leverage the new stateless VA decoders.
Pull request: https://github.com/WebKit/WebKit/pull/790
Committed r294540 (250795@main): <https://commits.webkit.org/250795@main> Reviewed commits have been landed. Closing PR #790 and removing active labels.
<rdar://problem/93643205>
For more discussion of the history behind this, see bug #197752.