Bug 918613

Summary:	media-video/ffmpeg-6.1[svg] fails to build against <gnome-base/librsvg-2.52.0
Product:	Gentoo Linux	Reporter:	jonys <vidra.jonas>
Component:	Current packages	Assignee:	Gentoo Media-video project <media-video>
Status:	UNCONFIRMED ---
Severity:	minor	Keywords:	PATCH
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
See Also:	https://trac.ffmpeg.org/ticket/10635
Whiteboard:
Package list:		Runtime testing required:	---
Attachments:	Patch fixing FFmpeg-6.1 compilation against librsvg <=2.51

Description jonys 2023-11-26 18:38:32 UTC

Created attachment 875732 [details]
Patch fixing FFmpeg-6.1 compilation against librsvg <=2.51

FFmpeg 6.1 contains a bug in include guards in librsvgdec.c, which causes compilation against older librsvg versions (<gnome-base/librsvg-2.52.0) to fail with the following error:

```
src/libavcodec/librsvgdec.c:93:5: error: ‘viewport’ undeclared (first use in this function)
```

Newer librsvg (>=gnome-base/librsvg-2.52.0) uses a different API and is not affected.

After adding the necessary include guards (see attached patch), FFmpeg compiles. I've tested SVG handling with the patched version and it works fine, including scaling.

Upstream bug: https://trac.ffmpeg.org/ticket/10635