av1parse: Correct the pts for frames inside a super frame.
The following discussion from !3155 (merged) should be addressed:
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@slomo started a discussion: (+6 comments) Copying from another discussion thread here
And AV1 has the same issue, which I need to improve. For the big input buffer, such as the super frame here and the whole TU buffer in AV1, when we split them into frames for the decoder, only the first frame has the correct PTS, and the left all have invalid PTS. But for most of the time(Spec really does not say that
😄 ), the last one is the only frame need to display.
CC @He_Junyan