[FFmpeg-devel] [RFC] webp decoding

[FFmpeg-devel] [RFC] webp decoding

[Michael Niedermayer]

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Hi

some people use webp apparently, and we have no decoder

There are 2 patchsets
Thilos v13 (native decoder)
Peters libwebp based one

I tested both and thilos code decodes the files from the 4709 ticket
i was not able to decode anything with peters patch. Iam not sure it
needs some demuxer changes that are missing it also didnt work with
the demuxer chanegs from thilos pacthset.

What i suggest is ... can we just apply thilos patchset ?

what do people think about that idea ?

It does have a review comment about use of nested decoders and direct
rendering not working. But honestly. That decoder (maybe marked as
experimental?) seems better than having no decoder

Do we have someone willing to work on webp ?
(Iam pretty sure we can fund that work someehow if interrest is conditional on US$)
Or is someone even already working on it ?

thx

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

No human being will ever know the Truth, for even if they happen to say it
by chance, they would not even known they had done so. -- Xenophanes

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Re: [FFmpeg-devel] [RFC] webp decoding

[Hendrik Leppkes]

On Thu, Jun 26, 2025 at 2:58 AM Michael Niedermayer
<michael@niedermayer.cc> wrote:
>
> Hi
>
> some people use webp apparently, and we have no decoder
>

libavcodec/webp.c is a decoder.

- Hendrik
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Re: [FFmpeg-devel] [RFC] webp decoding

[James Zern via ffmpeg-devel]

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From: James Zern <jzern@google.com>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [RFC] webp decoding
Date: Thu, 26 Jun 2025 10:33:43 -0700
Message-ID: <CABWgkX+SMJZvGsQez1RhnR_BUXyVfdSt=UURZEJCkEt_pyHBsA@mail.gmail.com>

On Thu, Jun 26, 2025 at 12:00 AM Hendrik Leppkes
<h.leppkes-at-gmail.com@ffmpeg.org> wrote:
>
> On Thu, Jun 26, 2025 at 2:58 AM Michael Niedermayer
> <michael@niedermayer.cc> wrote:
> >
> > Hi
> >
> > some people use webp apparently, and we have no decoder
> >
>
> libavcodec/webp.c is a decoder.
>

The missing piece is animated webp demuxing/decoding:

[webp @ 0x56227253be80] skipping unsupported chunk: ANIM
[webp @ 0x56227253be80] skipping unsupported chunk: ANMF
    Last message repeated 30 times
[webp @ 0x56227253be80] skipping unsupported chunk: XMP
[webp @ 0x56227253be80] image data not found

Thilo's implementation worked pretty well from what I remember of my
earlier testing. There may be some corner cases that behaved
differently from libwebp's animated decoder, but I don't remember the
details. If nothing else, functionally speaking, it seemed like a good
place to start.

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Re: [FFmpeg-devel] [RFC] webp decoding

[Michael Niedermayer]

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On Thu, Jun 26, 2025 at 10:33:43AM -0700, James Zern via ffmpeg-devel wrote:
> Date: Thu, 26 Jun 2025 10:33:43 -0700
> From: James Zern <jzern@google.com>
> To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
> Subject: Re: [FFmpeg-devel] [RFC] webp decoding
> 
> On Thu, Jun 26, 2025 at 12:00 AM Hendrik Leppkes
> <h.leppkes-at-gmail.com@ffmpeg.org> wrote:
> >
> > On Thu, Jun 26, 2025 at 2:58 AM Michael Niedermayer
> > <michael@niedermayer.cc> wrote:
> > >
> > > Hi
> > >
> > > some people use webp apparently, and we have no decoder
> > >
> >
> > libavcodec/webp.c is a decoder.
> >
> 
> The missing piece is animated webp demuxing/decoding:

yes, i forgot the "animated" in my mail :)
i of course meant animated webp


[...]

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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Some Animals are More Equal Than Others. - George Orwell's book Animal Farm

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