Bug#490319: ffmpeg2theora: FTBFS: ld: cannot find -ldc1394_control

[Fabian Greffrath]

Hi all,

Reinhard Tartler schrieb:
>> It looks like the dependencies of libavdevice-dev are a bit messed up
>> as follows:
>>  - libavdevice-dev Depends on libavdevice52
>>  - libavdevice52 Depends on libdc1394-13 (*Note*: not libdc1394-22)

WTF? Why does libavdevice52 depend on the old libdc1394 library 
although the new one is listed first in the Build-Depends?!

>>  - the file /usr/lib/pkgconfig/libavdevice.pc that ships with
>>    libavdevice-dev should not explicitly add -llibdc1394_control
>>    to the build flags.

Right. This should happen automatically in ffmpeg's configure script 
in lines 1656ff. However, the Debian package seems to have built 
against the old lib - which is highly unexpected - and pulls in the 
new lib as a dependency for the libavformat-dev package.

> Since you have changed the dependencies for libdc1394-13-dev to
> libdc1394-22-dev, could you please investigate this issue? I don't know
> much about firefire libs, but it seems to me that the version of ffmpeg
> we ship is not prepared use the newer version. I'd therefore suggest to
> revert the switch to libdc1394-22-dev, but I wanted to give you the
> oppurtunity to comment on the issue.

Sure, we can switch it back. But to be honest, I cannot explain why 
this issue arose at all. As far as I cann tell all Build-Depends and 
Depends are set correctly.

We have both the new and the old lib in the Build-Depends as 
alternatives. Since we list the new one first, we expect ffmpeg to 
build against it. Thus we set the new lib as a dependency for the 
resulting libavformat-dev package.
The package at hand has however been built against the old lib. The 
pkg-config file has been set correctly to link against the old lib, 
but we pull in the new one via the libavformat-dev dependencies.

That's strange...




-- 
Dipl.-Phys. Fabian Greffrath

Ruhr-Universität Bochum
Lehrstuhl für Energieanlagen und Energieprozesstechnik (LEAT)
Universitätsstr. 150, IB 3/134
D-44780 Bochum

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E-Mail:  greffrath at leat.ruhr-uni-bochum.de