Unable to encode vp8 with sound

[jamarparris]

I'm unable to encode vp8 using the disable_audio=false attribute in my _config.sh. It just errors out. H264 works just fine. If I remove the disable_audio line, it works but then I have no sound.

The error that I get is:

Only VP8 or VP9 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM. av_interleaved_write_frame(): Invalid argument and Error writing trailer of <file>: Invalid argument

This is my ffmpeg config. I do also have --enable-libvorbis and --enable-libvpx as you can see below.

  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --disable-lzma --enable-nonfree --enable-vda
  libavutil      55. 34.100 / 55. 34.100
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.100 / 57. 56.100
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libavresample   3.  1.  0 /  3.  1.  0
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100

Trying it via the command line: expose disable_audio=false doesn't error out but the video has no sound.