Re: [FFmpeg-devel] [PATCH v9 13/13] vvcdec: add vvc decoder

[Lynne <dev@lynne.ee>]

Jan 2, 2024, 10:39 by nuomi2021@gmail.com:

> On Mon, Jan 1, 2024 at 11:22 PM Lynne <dev@lynne.ee> wrote:
>
>> Jan 1, 2024, 16:14 by h.leppkes@gmail.com:
>>
>> > On Mon, Jan 1, 2024 at 3:54 PM Lynne <dev@lynne.ee> wrote:
>> >
>> >>
>> >> Jan 1, 2024, 15:16 by nuomi2021@gmail.com:
>> >>
>> >> > vvc decoder plug-in to avcodec.
>> >> > split frames into slices/tiles and send them to vvc_thread for
>> further decoding
>> >> > reorder and wait for the frame decoding to be done and output the
>> frame
>> >> >
>> >> > Features:
>> >> >  + Support I, P, B frames
>> >> >  + Support 8/10/12 bits, chroma 400, 420, 422, and 444 and range
>> extension
>> >> >  + Support VVC new tools like MIP, CCLM, AFFINE, GPM, DMVR, PROF,
>> BDOF, LMCS, ALF
>> >> >  + 295 conformace clips passed
>> >> >  - Not support RPR, IBC, PALETTE, and other minor features yet
>> >> >
>> >>
>> >> IBC == Intra-block copy?
>> >> Palette == palette (screen content) coding?
>> >>
>> >
>> > Yes; Both IBC and PALETTE modes are alternate block coding modes, with
>> > these two primarily optimized for screen content.
>> >
>>
>> IBC is more general purpose in AV1 afaik.
>> They are rather important these days, is there a chance they could be
>> implemented before merging?
>>
>
> Hi  Hendrik,
> Thank you for your help.
>
> Hi Lynne,
> A contributor submitted an IBC implementation at
> https://github.com/ffvvc/FFmpeg/pull/169, but it still needs time to
> finish.
> They are delta features. Even today, HEVC decoder does not support IBC and
> Palette coding.
>

HEVC got the palette/screen coding tools much later on as an extension
that no one really uses or implements, but with VVC they're there in the
original spec, so it's a bit different, but okay.


> We can submit the enhancement after the merge.
>

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