D:\encoding>ffmpeg -i input.wmv -map_metadata -1 -c copy output.wmv
ffmpeg version 4.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.1.1 (GCC) 20190807
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  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
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, asf, from 'input.wmv':
  Metadata:
    DeviceConformanceTemplate: AP@L3
    WM/WMADRCPeakReference: 32767
    WM/WMADRCPeakTarget: 32767
    WM/WMADRCAverageReference: 1723
    WM/WMADRCAverageTarget: 1723
    lyrics-eng      : publisher
    VideoOrientation: 0
    WMFSDKVersion   : 11.0.5721.5275
    WMFSDKNeeded    : 0.0.0.0000
    WM/URL          : publisher
    WM/UserWebURL   : publisher
    WM/CodedBy      : publisher
    WM/ItunesPodcastURL: publisher
    WM/TitleSortOrder: publisher
    WM/Show         : publisher
    title           : publisher
    artist          : publisher
    album           : publisher
    genre           : publisher
    composer        : publisher
    TOPE            : publisher
    copyright       : publisher
    encoded_by      : publisher
    comment         : publisher
    IsVBR           : 0
    MediaFoundationVersion: 2.112
  Duration: 01:04:55.07, start: 0.000000, bitrate: 6010 kb/s
    Stream #0:0: Audio: wmapro (b[1][0][0] / 0x0162), 44100 Hz, stereo, fltp, 256 kb/s
    Stream #0:1: Video: vc1 (Advanced) (WVC1 / 0x31435657), yuv420p, 1920x1080, 5744 kb/s, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 1k tbn, 1k tbc
Output #0, asf, to 'output.wmv':
  Metadata:
    WM/EncodingSettings: Lavf58.29.100
    Stream #0:0: Video: vc1 (Advanced) (WVC1 / 0x31435657), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 5744 kb/s, 30 fps, 30 tbr, 1k tbn, 1k tbc
    Stream #0:1: Audio: wmapro (b[1][0][0] / 0x0162), 44100 Hz, stereo, fltp, 256 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
[asf @ 000001ba7c7bf540] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
frame=116851 fps=23602 q=-1.0 Lsize= 2901864kB time=01:04:55.05 bitrate=6103.1kbits/s speed= 787x
video:2721616kB audio:121751kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.057323%