Le 13/03/2025 à 18:03, Lynne a écrit :
This series of commits adds a fully compliant version 3 and 4 hardware
accelerator code for FFv1 written in Vulkan.
Thank you for this hard work!
I tested today's master branch with lot of different pix_fmts and FFV1
encoder settings on both Linux and Windows, I found buggy decoding for
theses use cases:
wget https://mediaarea.net/temp/2K1.5K16-bit.dpx
./ffmpeg -y -i 2K1.5K16-bit.dpx -c:v ffv1 -context 1 -g 1 -level 3
2K1.5K16-bit.mkv
./ffmpeg -y -hwaccel vulkan -i 2K1.5K16-bit.mkv 2K1.5K16-bit.png
(wrong output)
wget https://mediaarea.net/temp/600x402x8-bit.dpx
./ffmpeg -y -i 600x402x8-bit.dpx -c:v ffv1 -coder 0 -context 1 -g 1
-level 3 600x402x8-bit.mkv
./ffmpeg -y -hwaccel vulkan -i 600x402x8-bit.mkv 600x402x8-bit.png
(stall)
./ffmpeg -y -i 600x402x8-bit.dpx -c:v ffv1 -coder 1 -context 1 -g 1
-level 3 600x402x8-bit.mkv
./ffmpeg -y -hwaccel vulkan -i 600x402x8-bit.mkv 600x402x8-bit.png
(wrong output)
Note that replacing " -context 1" by " -context 0" during encoding makes
the HW decoding fine.
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