On 02.11.2025 00:38, Niklas Haas via ffmpeg-devel wrote:
Hi all,at VDD'25 multiple people discussed interest in the ability to improve the filter negotiation around hardware filters; specifically about avoiding the need to constantly set the pixel formats manually when going from HW to SW, and also automatically insert hwupload/hwdownload filters when needed. I raised the possibility of funding it via an SPI bounty, and received widespread approval. I am familiar with this code and have previously attempted solving this exact problem on my own time, so I feel like I have a good understanding of what needs to be done to make it possible. I would like to formally propose allocating a bounty of 10,000 EUR for this task; which would cover all necessary prerequisite changes (such as fixing the hwupload/hwmap), full negotiation of swformats, and automatic hwupload/hwdownload insertion.
Definitely one of the bigger pain-points when using FFmpeg with hardware accelerated filter chains, specially when you start mixing different flavours like Vulkan, VAAPI, CUDA, ... in one chain.
So I'm all for it.
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