Support for VoxWare MetaVoice

[xd009642]

So I've found ffmpeg works well with Voxware metasound but there's another Voxware codec designed for more efficient encoding of speech data which don't appear to work. Below is the ffprobe output for my attached test file:

ffprobe speechtest-mvoice3.asf
ffprobe version 4.2.3 Copyright (c) 2007-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --disable-debug --disable-doc --disable-ffplay --disable-x86asm --enable-libgsm --enable-shared --enable-avresample --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-gpl --enable-libass --enable-fontconfig --enable-libfreetype --enable-libvidstab --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxcb --enable-libx265 --enable-libxvid --enable-libx264 --enable-nonfree --enable-openssl --enable-libfdk_aac --enable-postproc --enable-small --enable-version3 --enable-libbluray --enable-libzmq --enable-libilbc --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-libopenjpeg --enable-libkvazaar --enable-libaom --extra-libs=-lpthread --enable-libsrt --extra-cflags=-I/opt/ffmpeg/include --extra-ldflags=-L/opt/ffmpeg/lib
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
[asf @ 0x558d94756d00] Could not find codec parameters for stream 0 (Audio: none (t[0][0][0] / 0x0074), 8000 Hz, 1 channels, 2 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, asf, from 'speechtest-mvoice3.asf':
  Duration: 00:00:11.38, start: 0.000000, bitrate: 4 kb/s
    Stream #0:0: Audio: none (t[0][0][0] / 0x0074), 8000 Hz, 1 channels, 2 kb/s
Unsupported codec with id 0 for input stream 0

[xd009642]

Voxware MetaVoice - RT29V2

[xd009642]

Voxware MetaVoice - RT24V2

[xd009642]

I've just added some more voxware files that aren't yet supported