[FFmpeg-devel] Re: [Question] Learning about VVC and wasm

[Frank Plowman via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

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On 13/11/2025 16:46, Sidd via ffmpeg-devel wrote:
> Hi, I was curious on learning more about VVC and wasm within the
> ffmpeg project and would like some guidance on where to find the docs
> and references to go through
> 
> I am simply trying to get my hands dirty with a past GSoC project to
> get the feel of working on the source code (hopefully to understand it
> better)
> 
> Any help on this would be much appreciated

If you have prior experience with AVC and HEVC, [1] is an overview of
what was introduced in VVC.  If not, a good place to start would be with
Iain E. Richardson's "The H.264 Advanced Video Compression Standard".
He's also got a new book out, "Coding Video: A Practical Guide to HEVC
and Beyond", but I'm not sure if that’s a good introductory text or
whether it assumes some knowledge.

As far as FFmpeg’s implementation goes, probably the most notable thing
is the wavefront parallel processing (WPP) multithreading model, which
is documented to some extent at [2].  The code for the multithreading
aspect is pretty well-contained to libavcodec/vvc/thread.c so you can
get a sense of how the decoder works at a high level there.  There
aren't many docs for the decoder though really: it's an implementation
of the standard.  In terms of the progress on the decoder and what needs
work, its C code is in a good state but it needs more assembly written
for it, particularly on x86.

If you have any specific questions about VVC or the FFmpeg
implementation, feel free to ask me.  I don't know anything about wasm.

[1] https://ieeexplore.ieee.org/document/9503377/
[2] https://archive.fosdem.org/2024/events/attachments/fosdem-2024-3538-
ffmpeg-vvc-decoder/slides/22900/VVC_decoder_in_FFmpeg_Handout-1_FP3o8rS.pdf

--
All the best,
Frank

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