Metadata tags for mmsT:// streams

[max79]

Please add oportunity to deliver metadata tags from mmsT:// Radio-streams. Now it works only for mms:// streams. Example:

mmst://wm12.spacialnet.com/Julianradio

[James]

$ ./ffmpeg -i mmst://wm12.spacialnet.com/Julianradio
ffmpeg version N-86808-g32cdbd1bd9 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 7.1.0 (Rev2, Built by MSYS2 project)
  configuration: --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libwebp --cpu=haswell --extra-cflags='-D_WIN32_WINNT=0x0602' --cc='ccache gcc' --samples=../samples --prefix=/mingw64
  libavutil      55. 67.100 / 55. 67.100
  libavcodec     57.101.100 / 57.101.100
  libavformat    57. 75.100 / 57. 75.100
  libavdevice    57.  7.100 / 57.  7.100
  libavfilter     6. 95.100 /  6. 95.100
  libswscale      4.  7.101 /  4.  7.101
  libswresample   2.  8.100 /  2.  8.100
  libpostproc    54.  6.100 / 54.  6.100
[wmv3 @ 00000000006eb9e0] Extra data: 8 bits left, value: 0
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, asf, from 'mmst://wm12.spacialnet.com/Julianradio':
  Metadata:
    IsVBR           : 0
    MediaFoundationVersion: 2.112
    title           : Utesov - 1
    artist          : Julian TV
  Duration: N/A, start: 491.113000, bitrate: 878 kb/s
    Stream #0:0(eng): Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 384x288, 750 kb/s, SAR 1:1 DAR 4:3, 30 fps, 30 tbr, 1k tbn, 1k tbc
    Stream #0:1(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo, fltp, 128 kb/s
At least one output file must be specified

Metadata seems to work with ffmpeg for that stream.