Out of nowhere we have started to get a lot of these:

[WARNING] switch_core_file.c:408 File has 1 channels, muxing to 2 channels will occur. 
[WARNING] switch_core_file.c:408 File has 1 channels, muxing to 2 channels will occur.  [WARNING] switch_core_file.c:408 File has 1 channels, muxing to 2 channels will occur. 

I've tried to look in the code for an explanation, without succes.

Does anyone know why this is appearing ?

Thank you,

  Allan