Discord.Net: Voice Is Not Working

I’m trying to transmit video to discord with ffmpeg. It opens the file and I can see it reading(I tested it) but I can’t hear anything on discord. The bot is in the voice channel and it is not muted.

private async Task TransmitAudio(Song.Song song)
       {
           // Create FFmpeg 
           try
           {
               var ffmpeg = CreateStream(song);
               var output = ffmpeg.StandardOutput.BaseStream;
               var discord = audioClient.CreatePCMStream(AudioApplication.Mixed);
               await output.CopyToAsync(discord);
               await discord.FlushAsync();
           }
           catch (Exception e)
           {
               Console.WriteLine(e);
           }
       }

       private Process CreateStream(Song.Song song)
       {
           Console.WriteLine(song.filename);
           var ffmpeg = new ProcessStartInfo
           {
               FileName = "ffmpeg",
               Arguments = $"-i \"{song.filename}\" -ac 2 -f s16le -ar 48000 pipe:1",
               UseShellExecute = false,
               RedirectStandardOutput = true,
               CreateNoWindow = false
           };
           return Process.Start(ffmpeg);
       }

output:

22:34:00 Discord     Discord.Net v1.0.1 (API v6)
22:34:01 Gateway     Connecting
22:34:02 Gateway     Connected
22:34:03 Gateway     Ready
Channel botmessaging set as the bot channel.
22:34:09 Audio #1    Connecting
22:34:09 Audio #1    Unknown OpCode (8)
22:34:10 Audio #1    Connected
c:\users\boti\documents\visual studio 2017\Projects\LemonBOT\LemonBOT\bin\Debug\downloads\kXYiU_JCYtU.webm
ffmpeg version N-83657-g7e4f32f Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --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-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  libavutil      55. 47.100 / 55. 47.100
  libavcodec     57. 81.100 / 57. 81.100
  libavformat    57. 66.102 / 57. 66.102
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 74.100 /  6. 74.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Input #0, matroska,webm, from 'c:\users\boti\documents\visual studio 2017\Projects\LemonBOT\LemonBOT\bin\Debug\downloads\kXYiU_JCYtU.webm':
  Metadata:
    encoder         : google
  Duration: 00:03:06.14, start: -0.007000, bitrate: 125 kb/s
    Stream #0:0(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
Output #0, s16le, to 'pipe:1':
  Metadata:
    encoder         : Lavf57.66.102
    Stream #0:0(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s (default)
    Metadata:
      encoder         : Lavc57.81.100 pcm_s16le
Stream mapping:
  Stream #0:0 -> #0:0 (opus (native) -> pcm_s16le (native))
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