Hi team.!

In Centos7 with libpng 1.5 version 
When I dial conference number I can witness an ERR 
[ERR] switch_core_video.c:2879 This function is not available, libpng not installed... 
Conference call doesn't use video its just audio call.. The calls works properly but this error bothers me of what the problem is? 
Someone please help in fixing this. 
I run another FS setup in Debian machine where there s no such error as libpng 1.6 version is available 
Note: 
libpng is up to date in my centos 7(libpng1.5 which is what available for centos7) but freeswitch needs libpng 1.6, I guess.

Thanks in advance

Akshaya J