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Date: Thu, 21 Mar 2024 00:09:52 +0100 (CET)
From: Lynne <dev@lynne.ee>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
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Subject: Re: [FFmpeg-devel] sizeof(HEVCVPS)
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Mar 20, 2024, 23:24 by michael@niedermayer.cc:

> Hi
>
> why is sizeof(HEVCVPS) is 7463476 ?
>
> If you think about this for a moment, a VPS in the bit stream is what, 5 bytes ?
>
> Now iam not even talking about someone proving you a 10mb file with a million VPSs
> 7TB allocation, memsets memcpies, ...
>
> But even with a totally normal file 7mb is easily bigger than the frame buffer
> that wastes memory, it wastes cpu time, it wastes data cache
>

As discussed on IRC, Vulkan ran into this.
The size of all HEVC structs (SPS, VPS, PPS) at their maximum array sizes is ~120 Mb.
That's why there's a function in Vulkan to allocate them on demand.
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