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Draft: V4L2 AV1 decoder

Randy Li requested to merge ayaka/gstreamer:review_v4l2_av1 into main

I think it is too early to fix the bitstream syntax format. Some hardware could decode obu.

Currently, it would be useful for developing the av1parse.

@ndufresne I think the framerate here is invalid, it should be removed. Many drivers don't like the timeperframe.denominator == 0

video/x-av1, alignment=(string)frame, width=(int)3840, height=(int)2160, framerate=(fraction)0/1, chroma-format=(string)4:2:0, bit-depth-luma=(uint)8, bit-depth-chroma=(uint)8, parsed=(boolean)true, stream-format=(string)obu-stream, profile=(string)main

caps = video/x-av1, alignment=(string)tu, width=(int)3840, height=(int)2160, framerate=(fraction)0/1, chroma-format=(string)4:2:0, bit-depth-luma=(uint)8, bit-depth-chroma=(uint)8, parsed=(boolean)true, stream-format=(string)annexb, profile=(string)main

Edited by Randy Li

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