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POhighgui complaining that it needs >=17.0.0 when I have 20.0
 

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  1. POhighgui complaining that it needs >=17.0.0 when I have 20.0
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    <p>This is kind of an ugly one, but I am stuck so here it goes:</p> <p>I am writing a dynamic library (henceforth 'mylib.dylib') that uses opencv (highgui and other parts) and is ultimately loaded by ffmpeg (libavfilter). The library compiles just fine. But when I try to dlopen() the dylib from within ffmpeg, I get the following error:</p> <pre><code>mylib.dylib: dlopen(mylib.dylib, 2): Library not loaded: /usr/local/lib/libpng15.15.dylib Referenced from: /usr/local/lib/libopencv_highgui.2.3.dylib Reason: Incompatible library version: libopencv_highgui.2.3.dylib requires version 17.0.0 or later, but libpng15.15.dylib provides version 16.0.0 </code></pre> <p>However, when I run <strong>otool -L /usr/local/lib/libpng15.15.dylib</strong> I get the following:</p> <pre><code>/usr/local/lib/libpng15.15.dylib: /usr/local/lib/libpng15.15.dylib (compatibility version 20.0.0, current version 20.0.0) /usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.5) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 159.0.0) </code></pre> <p>Last time I checked, 20.0.0 is later than 17.0.0, which is what highgui said it requires.</p> <p>I thought maybe it was an architecture problem (I am on a Mac running Lion, so I've encountered a lot of problems with i386/x86_64), but running 'file' on all of the libraries revealed that everything (highgui, libpng, mylib) is <strong>Mach-O 64-bit dynamically linked shared library x86_64</strong> </p> <p>I thought perhaps there was some other version of libpng hiding on my system somewhere, but the dlopen error specifically points to /usr/local/lib/libpng15.15.dylib</p> <p>There is obviously something that I am missing here -- admittedly I am no expert on how these dynamic libraries link. So if I forgot to include some pertinent info, please excuse me.</p> <p><strong>UPDATE</strong> I forgot to mention -- the lib works fine when I run ffmpeg through XCode (no dlopen error) which leads me to believe that it might have something to do with a environment variable that XCode is setting that I am not. </p> <p>Thanks!</p> <p><strong>SOLUTION</strong> 1. Don't be dumb I was using MAMP and since I was calling ffmpeg through a php script, it was using its own set of dylibs, which (surprise surprise) included libpng 16.0.0</p>
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