AV1 Decoding Shuttering on 4K HDR Clips

Hi,

I was wondering which deooder does fireCore uses for playback of AV1 Content?

The dav1d decoder from VIdeoLAN is really matured and also reached 1.0 recently, in vlc, firefox, chrome, we are able to decode 10bit 4k HDR videos without shuttering as uses more recent decoder and threading works very well,

I did not find any details of which decoder it uses under the hood, and on m1 pro 14", it is having choppy playback even if we have enough good hardware.