Support capturing already encoded video streams, which takes advantage of encoding done in hardware by devices which support this feature.
Avoid using experimental GStreamer elements for video demuxing.
Avoid using the legacy GStreamer VA-API decoding plug-ins, which often cause rendering issues and are not much maintained. Their usage can be re-enabled setting WEBKIT_GST_ENABLE_LEGACY_VAAPI=1 in the environment.
Fix playback of YouTube streams which use dynamic ad insertion.