Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, wav, from 'pipe:':
  Duration: N/A, bitrate: 1411 kb/s
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
Output #0, rtp, to 'rtp://192.168.254.31:1234':
  Metadata:
    encoder         : Lavf57.56.101
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, mono, s16p
    Metadata:
      encoder         : Lavc57.64.101 libmp3lame
SDP:
v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 192.168.254.31
t=0 0
a=tool:libavformat 57.56.101
m=audio 1234 RTP/AVP 14

Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16le (native) -> mp3 (libmp3lame))
^CAborted by signal Interrupt... bitrate=  64.6kbits/s speed=1.05x