Bug#482717: Latest gstreamer0.10-ffmpeg breaks gnome

[Fabian Greffrath]

Reinhard Tartler schrieb:
> In the end I think we should disable 005_runtime_cpudetect.diff. It is 2
> years old, and its purpose is to "fix" runtime cpu detection on m68k and
> i386. Runtime CPU detection isn't really favored upstream, see
> http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2008-March/043886.html
> and the resulting thread here.

Allright, on patch less that diverges us from upstream.

> However, a doable solution has been proposed here. lu_zero, the gentoo
> ffmpeg maintainer suggested that we should install an altivec disabled
> libavcodec in /usr/lib and an altivec enabled version in
> /usr/lib/altivec. First very simple tests show the expected result.

Erm, does any other package in Debian do it this way? Is this even FHS 
compliant? Will altivec systems know where to find 'their' libs or 
will there be other magic involved?

> In any case, I think I will work on reorganising the debian/rules build
> target to ease building different flavors, at best in paralell. I intend
> to do so to copy (using `cp -rl`) the ffmpeg source in build directories
> ('build/$flavor') and build there. 

Well, allright. This sounds complicated but seems to be the cleanest 
solution to provide all possible sets of optimized and unoptimized 
libraries for all supported architectures.

> Furthermore this leads to maintaining
> a build matrix for the following flavors:
> 
>  - static
>  - dynamic, noopt
>  - dynamic, MMX (amd64, i386)
>  - dynamic, altivec (powerpc)
>  - dynamic, VIS (sparc)
> 
> and so on.

May I assume that packages like gstreamer0.10-ffmpeg depend on 
'dynamic, noopt' in the first place and that other, optizmized library 
packages may be installed additionally or as a replacement on 
architectures that support it? If it is possible at all, why don't we 
provide non-altivec shared libs by now?


-- 
Dipl.-Phys. Fabian Greffrath

Ruhr-Universität Bochum
Lehrstuhl für Energieanlagen und Energieprozesstechnik (LEAT)
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