bug#53295: [PATCH] gnu: Add FFmpeg 5.0.

[Marius Bakke]

Ludovic Courtès <ludo@gnu.org> skriver:

> Hi,
>
> Leo Famulari <leo@famulari.name> skribis:
>
>> Here's the new major release of FFmpeg.
>>
>> We can add it right away and move users over to it incrementally as we
>> test them — having this new version is useful for people like me who use
>> FFmpeg directly.
>>
>> Also, I always found our FFmpeg packages' use of inheritance to be
>> confusing when making changes to them, so I didn't use it here.
>>
>> * gnu/packages/video.scm (ffmpeg-5): New variable.
>
> Could you remove input labels?  (I think ‘guix style’ can’t help because
> of the conditional in the middle.)
>
> That said, it seems to me there’s a lot of duplication here compared to
> version 4.  So I’d be in favor of inheriting from that one.

I went ahead and pushed this patch in 1cb10f696813ef23678029, with the
adjustments Ludo recommended + G-expressions; as well as a follow-up
that makes ffmpeg@4 inherit from it.

Thanks Leo & Ludo!

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