dav1d is the fastest AV1 decoder on all platforms :)
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Matthias Dressel eb0308bcdf x86/itx: Add 12-bit 4x4 transforms in AVX2 2 weeks ago
doc Move logo to doc/ folder 1 year ago
examples dav1dplay: Avoid using external libplacebo data symbols 2 weeks ago
include Fix compilation when using the gcc atomic wrappers 3 weeks ago
package CI: Fix PIC test on 32-bit x86 1 year ago
src x86/itx: Add 12-bit 4x4 transforms in AVX2 4 days ago
tests x86: Add sgr AVX-512 (Ice Lake) asm 5 days ago
tools Add automatic thread count selection 1 month ago
.gitignore tools: add optional xxh3 based muxer 9 months ago
.gitlab-ci.yml CI: Update CI images 5 days ago
CONTRIBUTING.md contributing: document the allowed internal use of anonymous structs/unions 1 year ago
COPYING Update copyright years 3 years ago
NEWS Update NEWS for 0.9.2 2 months ago
README.md Update README roadmap 2 months ago
THANKS.md Update THANKS.md 11 months ago
gcovr.cfg CI: Enable coverage reports 1 year ago
meson.build x86: Remove the option to disable AVX-512 5 days ago
meson_options.txt x86: Remove the option to disable AVX-512 5 days ago


dav1d logo


dav1d is a new AV1 cross-platform decoder, open-source, and focused on speed and correctness.

The canonical repository URL for this repo is https://code.videolan.org/videolan/dav1d

This project is partially funded by the Alliance for Open Media/AOM.

Goal and Features

The goal of this project is to provide a decoder for most platforms, and achieve the highest speed possible to overcome the temporary lack of AV1 hardware decoder.

It supports all features from AV1, including all subsampling and bit-depth parameters.

In the future, this project will host simple tools or simple wrappings (like, for example, an MFT transform).


dav1d is released under a very liberal license, a contrario from the other VideoLAN projects, so that it can be embedded anywhere, including non-open-source software; or even drivers, to allow the creation of hybrid decoders.

The reasoning behind this decision is the same as for libvorbis, see RMS on vorbis.


The plan is the following:


  1. Complete C implementation of the decoder,
  2. Provide a usable API,
  3. Port to most platforms,
  4. Make it fast on desktop, by writing asm for AVX2 chips.
  5. Make it fast on mobile, by writing asm for ARMv8 chips,
  6. Make it fast on older desktop, by writing asm for SSSE3+ chips,
  7. Make high bit-depth fast on mobile, by writing asm for ARMv8 chips.
  8. Make it fast on older mobile, by writing asm for ARMv7 chips,
  9. Make high bit-depth fast on older mobile, by writing asm for ARMv7 chips,
  10. Make high bit-depth fast on desktop, by writing asm for AVX2 chips,
  11. Make high bit-depth fast on older desktop, by writing asm for SSSE3+ chips,


  1. Improve C code base with various tweaks,
  2. Accelerate for less common architectures, like PPC, SSE2 or AVX-512.
  3. Improve threading.


  1. Use more GPU decoding, when possible.


Currently, we are looking for help from:

  • C developers,
  • asm developers,
  • platform-specific developers,
  • GPGPU developers,
  • testers.

Our contributions guidelines are quite strict. We want to build a coherent codebase to simplify maintenance and achieve the highest possible speed.

Notably, the codebase is in pure C and asm.

We are on IRC, on the #dav1d channel on Libera.chat. If you do not have an IRC Client at hand, use IRC Web Interface.

See the contributions document.


There is no CLA.

People will keep their copyright and their authorship rights, while adhering to the BSD 2-clause license.

VideoLAN will only have the collective work rights.


The VideoLAN Code of Conduct applies to this project.


  1. Install Meson (0.47 or higher), Ninja, and, for x86* targets, nasm (2.14 or higher)
  2. Run mkdir build && cd build to create a build directory and enter it
  3. Run meson .. to configure meson, add --default-library=static if static linking is desired
  4. Run ninja to compile

Cross-Compilation for 32- or 64-bit Windows, 32-bit Linux

If you're on a linux build machine trying to compile .exe for a Windows target/host machine, run

meson build --cross-file=package/crossfiles/x86_64-w64-mingw32.meson

or, for 32-bit:

meson build --cross-file=package/crossfiles/i686-w64-mingw32.meson

mingw-w64 is a pre-requisite and should be installed on your linux machine via your preferred method or package manager. Note the binary name formats may differ between distributions. Verify the names, and use alias if certain binaries cannot be found.

For 32-bit linux, run

meson build --cross-file=package/crossfiles/i686-linux32.meson

Run tests

  1. In the root directory, run git clone https://code.videolan.org/videolan/dav1d-test-data.git tests/dav1d-test-data to fetch the test data repository
  2. During meson configuration, specify -Dtestdata_tests=true
  3. Run meson test -v after compiling


This project is partially funded by the Alliance for Open Media/AOM and is supported by TwoOrioles and VideoLabs.

These companies can provide support and integration help, should you need it.


Why do you not improve libaom rather than starting a new project?

  • We believe that libaom is a very good library. It was however developed for research purposes during AV1 design. We think that an implementation written from scratch can achieve faster decoding, in the same way that ffvp9 was faster than libvpx.

Is dav1d a recursive acronym?

  • Yes.

Can I help?

I am not a developer. Can I help?

  • Yes. We need testers, bug reporters and documentation writers.

What about the AV1 patent license?

  • This project is an implementation of a decoder. It gives you no special rights on the AV1 patents.

Please read the AV1 patent license that applies to the AV1 specification and codec.

Will you care about <my_arch>? <my_os>?

  • We do, but we don't have either the time or the knowledge. Therefore, patches and contributions welcome.

Where can I find documentation?

  • The current library documentation, built from master, can be found here.