Looks like in new Mesa you will have to explicitly enable codec support for the ones that are patent encumbered:
option( 'video-codecs', type : 'array', value : [], choices: [ 'vc1dec', 'h264dec', 'h264enc', 'h265dec', 'h265enc' ], description : 'List of patent encumbered codecs to build support for. Distros might want to consult their legal department before enabling these. This is used for all video APIs (vaapi, vdpau, vulkan). Non-patent encumbered codecs will be enabled by default.')
