VP9 profiles

Racape Fabien

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Nov 10, 2016, 4:21:32 AM11/10/16

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Dear all,

I have a question about VP9 profiling.

Do they respond to a sort of onion/overlap structures, e.g. is a decoder that support profile 2 expected to support profile 0 and 1 or only 0 (or none)?

The spec details how the profiles are parsed in section “6.2 Uncompressed header syntax”.

It is however unclear to me if the answer to the first question is positive, or if supporting profile 2, resp 3, means supporting also profile 0, resp 1 ( parse color_config), for example.

Thank you,

Fabien

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Yaowu Xu

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Nov 10, 2016, 9:19:35 PM11/10/16

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libvpx vp9 decoder, when configured and built with --enable-vp9-highbitdepth, supports decoding of all 4 profiles.

Racape Fabien

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Nov 15, 2016, 4:42:50 AM11/15/16

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Thank you for your answer.

I saw that in the reference software. The question is actually from the specification and conformance viewpoints.

For instance, will a decoder supporting profile 2 (10bit, 4:2:0) be able to decode a bitstream conforming to profile 1 (8bit, 4:4:4) and/or profile 0 (8bit, 4:2:0)?

Thank you,

Fabien

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Alexey Eromenko

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Nov 15, 2016, 6:05:32 AM11/15/16

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I think decoder profile 1 and 2 it must support profile 0, because it is a subset of their features, while decoder profile 3, must support ALL levels (0, 1, 2, 3). Profile 2 decoder doesn't need to support profile 1, because profile 1 is not a subset of profile 2.

-Alexey. E.

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Racape Fabien

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Nov 17, 2016, 3:24:55 AM11/17/16

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Thank you

Fabien

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