gst-ffmpeg conflicting lib versions

[John Stebbins]

Trying to get a clue...
I've got a application that has a snapshot of ffmpeg libs statically
linked.  I'm attempting to use the version of gst-ffmpeg plugin (0.10.5)
packaged with the distribution (ubuntu 8.10) which unfortunately has
been linked against the system ffmpeg libs.  Whenever gstreamer tries to
use the ffmpeg plugin, I'm getting a segfault.  My best guess is that
it's somehow accessing something in my statically linked ffmpeg
snapshot.  But I can't see how it would do that as its loaded
dynamically at run time and should not be able to see the symbols for
the static version.

Anybody have any ideas?


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[Sebastian Dröge-7]

Am Montag, den 01.12.2008, 11:06 -0800 schrieb John Stebbins:

> Trying to get a clue...
> I've got a application that has a snapshot of ffmpeg libs statically
> linked.  I'm attempting to use the version of gst-ffmpeg plugin (0.10.5)
> packaged with the distribution (ubuntu 8.10) which unfortunately has
> been linked against the system ffmpeg libs.  Whenever gstreamer tries to
> use the ffmpeg plugin, I'm getting a segfault.  My best guess is that
> it's somehow accessing something in my statically linked ffmpeg
> snapshot.  But I can't see how it would do that as its loaded
> dynamically at run time and should not be able to see the symbols for
> the static version.
>
> Anybody have any ideas?

Your application with the statically linked ffmpeg should somehow make
sure that the ffmpeg symbols are not exported. Also there's IIRC some
linked flag to make sure that global symbols inside the executable are
not overriden by some shared library (maybe -Bsymbolic ?).

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[John Stebbins]

Sebastian Dröge wrote:

> Am Montag, den 01.12.2008, 11:06 -0800 schrieb John Stebbins:
>  
>> Trying to get a clue...
>> I've got a application that has a snapshot of ffmpeg libs statically
>> linked.  I'm attempting to use the version of gst-ffmpeg plugin (0.10.5)
>> packaged with the distribution (ubuntu 8.10) which unfortunately has
>> been linked against the system ffmpeg libs.  Whenever gstreamer tries to
>> use the ffmpeg plugin, I'm getting a segfault.  My best guess is that
>> it's somehow accessing something in my statically linked ffmpeg
>> snapshot.  But I can't see how it would do that as its loaded
>> dynamically at run time and should not be able to see the symbols for
>> the static version.
>>
>> Anybody have any ideas?
>>    
>
> Your application with the statically linked ffmpeg should somehow make
> sure that the ffmpeg symbols are not exported. Also there's IIRC some
> linked flag to make sure that global symbols inside the executable are
> not overriden by some shared library (maybe -Bsymbolic ?).
>  
>

Sebastian, your a genius.  ld flag --exclude-libs solves the problem.  
Many thanks.

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