Bug#619530: ffmpeg: backport of 4:0.6.1-5 from unstable produces WARNING: library configuration mismatch

Faheem Mitha faheem at email.unc.edu
Mon Mar 28 11:54:12 UTC 2011

On Mon, 28 Mar 2011, Fabian Greffrath wrote:

> Am 28.03.2011 13:18, schrieb Faheem Mitha:
>> That "very verbose output" is part of the warning. :-)
> Yes, but you omitted it from your initial mail, which didn't make it easier 
> to find. ;)

No I didn't. Look again. It is all there. I wouldn't truncate such a 
warning. I said

"I backported ffmpeg 4:0.6.1-5 from unstable to squeeze. On running it,
I see the following warning

WARNING: library configuration mismatch

inter alia. The complete output of ffmpeg is given below."...

The complete output then follows. :-)

>> Hmm. Did you confirm this was the problem by changing the config flags?

> Yes, the culprit is that the ffmpeg frontend and the optimized shared 
> libraries are build with different configuration flags, which is quite 
> reasonable and obvious in this case.
>> If so, perhaps point out to the ffmpeg people that their warning is
>> (at least in some cases) a red herring (alternatively, produces a
>> false positive), and ask if it could be made more intelligent.
> The warning is only printed if the configurations differ. It does not tell 
> anything different, nor does it try to guess or suggest what may be the cause 
> of this. so again, I agree with siretart that on systems that support 
> differently configured shared libraries to work with the same backend, this 
> warning should be disabled, because it is a red herring and does not add 
> anything insightful.

Ok. So pointing this out to the ffmpeg people is a waste of time, in your 

                                                           Regards, Faheem

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