[FFmpeg-devel] [PATCH v2 1/4] avcodec/h2645_vui: Ensure color primaries/trc/space isn't reserved value

[Zhao Zhili]

> On May 27, 2025, at 02:48, Kieran Kunhya via ffmpeg-devel <ffmpeg-devel at ffmpeg.org> wrote:
> 
> On Mon, May 26, 2025 at 8:13 PM Zhao Zhili
> <quinkblack-at-foxmail.com at ffmpeg.org> wrote:
>> 
>> 
>> 
>>> On May 22, 2025, at 13:06, Zhao Zhili <quinkblack-at-foxmail.com at ffmpeg.org> wrote:
>>> 
>>> From: Zhao Zhili <zhilizhao at tencent.com>
>>> 
>>> Fix error reported by swscaler:
>>> Unsupported input (Operation not supported): fmt:yuv420p csp:unknown prim:reserved trc:bt709 -> fmt:yuv420p csp:bt709 prim:reserved trc:bt709
>>> —
>> 
>> 
>> Will apply soon.
> 
> Surely this should be filtered in swscale?
> I think we need to pass through future reserved values of csp and stuff.

Both of H.264 and H.265 spec says:

> Decoders shall interpret reserved values of colour_primaries as equivalent to the value 2.

The code matches the spec.

There is another similar topic in 2024

https://ffmpeg.org/pipermail/ffmpeg-devel/2024-December/337160.html

cc haasn. This is a regression. Should the fixes go into swscale/avfilter, or the decoder, or both?

Pass through reserved value of csp has its use case. However, it’s more common that those samples are generated by buggy software.

> 
> Kieran
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