[FFmpeg-devel] [PATCH v5 4/4] lavc: implement a Vulkan-based VC-2 encoder Implements a Vulkan based dirac encoder. Supports Haar and Legall wavelets and should work with all wavelet depths.

[Michael Niedermayer]

On Fri, May 23, 2025 at 11:23:48PM +0300, IndecisiveTurtle wrote:
> From: IndecisiveTurtle <geoster3d at gmail.com>
> 
> Performance wise, encoding a 3440x1440 1-minute video is performed in about 2.4 minutes with the cpu encoder running on my Ryzen 5 4600H, while it takes about 1.3 minutes on my NVIDIA GTX 1650
> 
> Haar shader has a subgroup optimized variant that applies when configured wavelet depth allows it
> ---
>  configure                                    |   1 +
>  libavcodec/Makefile                          |   3 +
>  libavcodec/allcodecs.c                       |   1 +
>  libavcodec/vc2enc.c                          |   2 +-
>  libavcodec/vc2enc_vulkan.c                   | 777 +++++++++++++++++++
>  libavcodec/vulkan/vc2_dwt_haar.comp          |  82 ++
>  libavcodec/vulkan/vc2_dwt_haar_subgroup.comp |  75 ++
>  libavcodec/vulkan/vc2_dwt_hor_legall.comp    |  82 ++
>  libavcodec/vulkan/vc2_dwt_upload.comp        |  96 +++
>  libavcodec/vulkan/vc2_dwt_ver_legall.comp    |  78 ++
>  libavcodec/vulkan/vc2_encode.comp            | 173 +++++
>  libavcodec/vulkan/vc2_slice_sizes.comp       | 170 ++++
>  12 files changed, 1539 insertions(+), 1 deletion(-)
>  create mode 100644 libavcodec/vc2enc_vulkan.c
>  create mode 100644 libavcodec/vulkan/vc2_dwt_haar.comp
>  create mode 100644 libavcodec/vulkan/vc2_dwt_haar_subgroup.comp
>  create mode 100644 libavcodec/vulkan/vc2_dwt_hor_legall.comp
>  create mode 100644 libavcodec/vulkan/vc2_dwt_upload.comp
>  create mode 100644 libavcodec/vulkan/vc2_dwt_ver_legall.comp
>  create mode 100644 libavcodec/vulkan/vc2_encode.comp
>  create mode 100644 libavcodec/vulkan/vc2_slice_sizes.comp

changes fate results:

--- ./tests/ref/vsynth/vsynth1-vc2-420p	2025-05-23 14:14:31.544448136 +0200
+++ tests/data/fate/vsynth1-vc2-420p	2025-05-26 00:35:09.596187444 +0200
@@ -1,4 +1,4 @@
-74df65b15463f098587d8c09d87286a1 *tests/data/fate/vsynth1-vc2-420p.mov
-1155415 tests/data/fate/vsynth1-vc2-420p.mov
+bea01eb2c6212e8828802fdb28dc7eaf *tests/data/fate/vsynth1-vc2-420p.mov
+1045964 tests/data/fate/vsynth1-vc2-420p.mov
 387696707c79cf1a6c9aeff4024226b9 *tests/data/fate/vsynth1-vc2-420p.out.rawvideo
 stddev:    0.00 PSNR:999.99 MAXDIFF:    0 bytes:  7603200/   760320
Test vsynth1-vc2-420p failed. Look at tests/data/fate/vsynth1-vc2-420p.err for details.


[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Everything should be made as simple as possible, but not simpler.
-- Albert Einstein
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