AVIF images with AOM Decoder problem - the error AOM_CODEC_UNSUP_BITSTREAM is returned on all images

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This question is for those familiar with the AVIF image format, and AOM Decoder.

While trying to open any AVIF image at all via the AOM decoder, which I built on Windows via Visual Studio 2019, I always get the error AOM_CODEC_UNSUP_BITSTREAM.

I traced it to the function decoder_peek_si_internal(), and the line of code that is returning the error is:

if (frame_marker != AOM_FRAME_MARKER) return AOM_CODEC_UNSUP_BITSTREAM;

frame_marker is always 0 on all the AVIF images I tested this with.

Can anyone please shed some light?

Thanks in advance.

decoderavif