plugin mgp123 not compiled (and not properly loaded even compiled manually)

[Tim Müller]

On Thu, 2014-06-19 at 13:41 +0200, Weipeng He wrote:

Hi,

> I am trying to compile gst-plugins-bad from source on Pidora.
> At first, I used configure && make && make install. Everything is fine 
> except several plugins are not compiled (including mpg123). Obviously 
> there are external libraries missing. Then I downloaded the libmpg123 
> source and compiled it.
> 
> Now, here comes the question #1. When I try to configure gst-plugins-bad 
> again, it still says libmpg123 not found and plugin mpg123 will not 
> compiled. I am sure libmpg123.so is in /usr/local/lib and mpg123.h is in 
> /usr/local/include.

Try:

 $ export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
 $ ./configure

Your errors mean it didn't link against the library when building the
plugin, which is unsurprising seeing that configure didn't find it.

  Cheers
   -Tim

> So, I went to directory ext/mpg123 and do make && make install. It was 
> successfully compiled.
> 
> Now, question #2. When i tried:
> $ gst-inspect-1.0 /usr/local/lib/gstreamer-1.0/libgstmpg123.so
> 
> The plugin can't be properly loaded, giving the following output:
> (gst-plugin-scanner:29481): GStreamer-WARNING **: Failed to load plugin 
> '/usr/local/lib/gstreamer-1.0/libgstmpg123.so': 
> /usr/local/lib/gstreamer-1.0/libgstmpg123.so: undefined symbol: mpg123_new
> 
> (gst-inspect-1.0:29480): GStreamer-WARNING **: Failed to load plugin 
> '/usr/local/lib/gstreamer-1.0/libgstmpg123.so': 
> /usr/local/lib/gstreamer-1.0/libgstmpg123.so: undefined symbol: mpg123_new
> Could not load plugin file: Opening module failed: 
> /usr/local/lib/gstreamer-1.0/libgstmpg123.so: undefined symbol: mpg123_new
> 
> And I also tryied:
> $ LD_PRELOAD=/usr/local/lib/libmpg123.so gst-inspect-1.0 
> /usr/local/lib/gstreamer-1.0/libgstmpg123.so
> Then it gives the right result.
> 
> I don't want to add "LD_PRELOAD=/usr/local/lib/libmpg123.so" for every 
> run. How can I solve this?
> Thank you!
> 
> Best,
> Weipeng
> 
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-- 
Tim Müller, Centricular Ltd - http://www.centricular.com