ffmpeg version N-69351-gfb34c58 Copyright (c) 2000-2015 the FFmpeg developers
  built on Jan 28 2015 02:36:35 with gcc 4.9.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  libavutil      54. 18.100 / 54. 18.100
  libavcodec     56. 21.100 / 56. 21.100
  libavformat    56. 19.100 / 56. 19.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5.  9.101 /  5.  9.101
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, wav, from 'Unknown Artist - Unknown Title.wav':
  Duration: 00:50:06.00, bitrate: 1411 kb/s
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, s16, 1411 kb/s
Output #0, flac, to 'Unknown Artist - Unknown Title.flac':
  Metadata:
    encoder         : Lavf56.19.100
    Stream #0:0: Audio: flac, 44100 Hz, stereo, s16, 128 kb/s
    Metadata:
      encoder         : Lavc56.21.100 flac
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16le (native) -> flac (native))
Press [q] to stop, [?] for help
size=   17095kB time=00:02:30.56 bitrate= 930.1kbits/s    
size=   36020kB time=00:05:07.40 bitrate= 959.9kbits/s    
size=   57627kB time=00:07:46.12 bitrate=1012.8kbits/s    
size=   74086kB time=00:10:25.16 bitrate= 970.8kbits/s    
size=   95511kB time=00:13:01.37 bitrate=1001.3kbits/s    
size=  113750kB time=00:15:42.91 bitrate= 988.3kbits/s    
size=  134562kB time=00:18:18.39 bitrate=1003.6kbits/s    
size=  153004kB time=00:20:58.57 bitrate= 995.9kbits/s    
size=  172768kB time=00:23:29.98 bitrate=1003.8kbits/s    
size=  191786kB time=00:26:11.73 bitrate= 999.6kbits/s    
size=  213130kB time=00:28:48.57 bitrate=1010.1kbits/s    
size=  231853kB time=00:31:24.99 bitrate=1007.6kbits/s    
size=  252954kB time=00:34:01.52 bitrate=1015.0kbits/s    
size=  272194kB time=00:36:39.40 bitrate=1013.8kbits/s    
size=  291008kB time=00:39:09.34 bitrate=1014.7kbits/s    
size=  308799kB time=00:41:49.84 bitrate=1007.9kbits/s    
size=  329063kB time=00:44:26.78 bitrate=1010.8kbits/s    
size=  346390kB time=00:47:06.03 bitrate=1004.1kbits/s    
size=  365961kB time=00:49:44.64 bitrate=1004.5kbits/s    
size=  367023kB time=00:50:06.00 bitrate=1000.2kbits/s    
video:0kB audio:367015kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.002205%