It seems to me that the S922x does not support the AV1.
S922X’s Amlogic Video Engine (AVE-10) supports MVC, MPEG-1/2/4, VC-1/WMV, AVS, AVS+, AVS2 RealVideo, MJPEG streams, H.264, H265-10 and VP9.
AV1 hardware acceleration isn’t supported.
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