media-driver VS SVT-AV1

You might need to install the non-free intel media driver: https://github.com/intel/media-driver

Intel had VP9 decode since Kaby Lake (7th gen); original Skylake (6th gen) could not handle it (see here).

I've heard intel-media-driver was the way to go for supported hardware, but I also heard that it could decode slower than libva-intel-driver (like #925), and that Intel doesn't officially support some kind of decode feature in intel-media-driver, but it's implemented in libva-intel-driver.

I reproduced the issue on my end and opened a ticket to let intel devs know. https://github.com/intel/media-driver/issues/1628

I can see 22.6.6 was released in December ( Releases · intel/media-driver (github.com) ), but I'm having troubles getting it installed.

You should be able to choose FFmpeg VAAPI encoder, though it is suggested that kernel 6.2 is needed for this to actually work. I can confirm that it's broken with my A770, while I can choose the device, encoder is failing. No such problem with my Rapter Lake iGPU.

On GitHub there are similar problems reported: https://github.com/intel/media-driver/issues/1282

Source: https://github.com/intel/media-driver/blob/master/docs/media_features.md

I wrote a little script that uses ffmpeg with settings similar to those in the guide, and then another ffmpeg run to extract the subtitles as vtt. I would be happy to share more of my settings if you are interested. Of course, your needs and mine may differ.

How about use the parameter "HighDynamicRangeInput" with command line "--enable-hdr 1"? It's from the official page: https://github.com/AOMediaCodec/SVT-AV1/blob/master/Docs/Parameters.md