ffmpeg version 2020-10-31-git-3da35b7cc7-full_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.0 (Rev3, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-lib
snappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --en
able-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --e
nable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --
enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwben
c --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --en
able-libsoxr --enable-chromaprint
  libavutil      56. 60.100 / 56. 60.100
  libavcodec     58.112.100 / 58.112.100
  libavformat    58. 64.100 / 58. 64.100
  libavdevice    58. 11.102 / 58. 11.102
  libavfilter     7. 88.100 /  7. 88.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
[matroska,webm @ 0000022af8fee740] Could not find codec parameters for stream 3 (Subtitle: hdmv_pgs_subtitle (pgssub)): unspecified size
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
[matroska,webm @ 0000022af8fee740] Could not find codec parameters for stream 4 (Subtitle: hdmv_pgs_subtitle (pgssub)): unspecified size
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, matroska,webm, from 'Y:\Video\Series\Dexter\Season 01\Dexter - S01E01.mkv':
  Metadata:
    CREATION_TIME   : 2015-08-31 07:12:21
    ENCODER         : Lavf56.40.101
  Duration: 00:53:01.18, start: 0.000000, bitrate: 4786 kb/s
    Chapter #0:0: start 0.000000, end 568.526289
    Metadata:
      title           : Capitolo 01
    Chapter #0:1: start 568.526289, end 1348.096733
    Metadata:
      title           : Capitolo 02
    Chapter #0:2: start 1348.096733, end 1945.360067
    Metadata:
      title           : Capitolo 03
    Chapter #0:3: start 1945.360067, end 2568.732822
    Metadata:
      title           : Capitolo 04
    Chapter #0:4: start 2568.732822, end 3088.043289
    Metadata:
      title           : Capitolo 05
    Chapter #0:5: start 3088.043289, end 3180.468956
    Metadata:
      title           : Capitolo 06
    Chapter #0:6: start 3180.468956, end 3181.178000
    Metadata:
      title           : Capitolo 07
    Stream #0:0: Video: h264 (Main), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Metadata:
      ENCODER         : Lavc56.58.100 libx264
      DURATION        : 00:53:01.178000000
    Stream #0:1(ita): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (default)
    Metadata:
      LANGUAGE        : ita
      DURATION        : 00:53:01.184000000
    Stream #0:2(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s (default)
    Metadata:
      LANGUAGE        : eng
      DURATION        : 00:53:01.184000000
    Stream #0:3(ita): Subtitle: hdmv_pgs_subtitle
    Metadata:
      LANGUAGE        : ita
      DURATION        : 00:53:00.552000000
    Stream #0:4(eng): Subtitle: hdmv_pgs_subtitle
    Metadata:
      LANGUAGE        : eng
      DURATION        : 00:51:23.789000000
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> vp9 (libvpx-vp9))
  Stream #0:2 -> #0:1 (ac3 (native) -> vorbis (libvorbis))
  Stream #0:3 -> #0:2 (copy)
Press [q] to stop, [?] for help
[libvpx-vp9 @ 0000022af901eb40] v1.9.0-100-g220e4331b
[webm @ 0000022af99d6c00] Only VP8 or VP9 or AV1 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 --
[libvorbis @ 0000022af901e6c0] 47 frames left in the queue on closing
Conversion failed!