[Bug 797314] in some cases, no log can be printed

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797314

--- Comment #4 from Stephen Xiao <stephen.xiao.zh at outlook.com> ---
(In reply to Sebastian Dröge (slomo) from comment #1)
> Can you provide this as a "git format-patch"-style patch? See
> https://gstreamer.freedesktop.org/documentation/contribute/index.html#how-to-
> submit-patches
> 
> It doesn't look correct however. The comparison should be <= _gst_debug_min
> because that one is the global maximum (no idea why it is called min!) of
> all debug category levels that are enabled.
> 
> How can the problem you observe be reproduced?

Actually there have a MACRO GST_LEVEL_MAX, I think it means golbal maximum.
>From code, we can easy find the comment about _gst_debug_min.

 617 /* the min debug level, used for quickly discarding debug                  
 618  * messages that fall under the threshold. */                              
 619                                                                            
 620 GST_API GstDebugLevel            _gst_debug_min;     

It's very easy to reproduce. Just enable gstreamer's debug and set debug level
to a vaild value(eg:GST_LEVEL_DEBUG), you will find there is no info printing
from your debugging code.

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