AV1 Hardware decoding not available on M3 Max chip

[CrushedAsian255]

System Details

• OS: [MacOS Sonoma 14.2.1]
• Thorium Version [116.0.5845.169]

Problem
The new M3 series of chips have native AV1 hardware decoding support. When playing a 4k AV1 encoded YouTube video, Safari uses around 20% of a single CPU core, however when playing in Thorium, the "Thorium Helper (Renderer)" uses 247% CPU usage.

Screenshots

Additional Notes
Video used: https://www.youtube.com/watch?v=nJRYDbV7jr0
YouTube Codec: av01.0.13M.08 (401) / opus (251)

[p7r0x7]

Please definitely compare not only to Safari but also to Chrome

[midzer]

Please try again with M120 whether the issue still exists.

[PriZmRL]

Same here. No problem on brave, firefox, safari, arc, and my ungoogled chromium build. The AV1 videos on youtube are stuttering like hell.

The only way i could go around it is going into youtube settings and set AV1 only for SD videos. Then 4K videos doesn't stutter.