Cannot Convert MP4 to WEBM

[ghost]

I got this message "If you have no idea what went wrong, open an issue on GitHub and copy paste the output of this window there." Hopefully someone answers this and can help other people with this issue as well.

Arguments: -i "C:\Users\marce\Downloads\testtest.mp4" -an -c:v libvpx -crf 32 -b:v 900K -threads 1 -metadata title="testtest" -quality best -lag-in-frames 16 -f webm -y "C:\Users\marce\Downloads\testtest.webm"
ffmpeg version N-62162-gec8789a Copyright (c) 2000-2014 the FFmpeg developers
built on Apr 4 2014 22:01:36 with gcc 4.8.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 74.100 / 52. 74.100
libavcodec 55. 57.100 / 55. 57.100
libavformat 55. 36.101 / 55. 36.101
libavdevice 55. 11.100 / 55. 11.100
libavfilter 4. 3.100 / 4. 3.100
libswscale 2. 6.100 / 2. 6.100
--- FFMPEG HAS EXITED ---
libswresample 0. 18.100 / 0. 18.100
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Users\marce\Downloads\testtest.mp4':
Metadata:
creation_time : 2020-05-07 22:13:40
encoder : vlc 3.0.10 stream output
encoder-eng : vlc 3.0.10 stream output
Duration: 00:00:00.00, bitrate: N/A
Codec AVOption crf (Select the quality for constant quality mode) specified for output file #0 (C:\Users\marce\Downloads\testtest.webm) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
Codec AVOption threads () specified for output file #0 (C:\Users\marce\Downloads\testtest.webm) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
Codec AVOption quality () specified for output file #0 (C:\Users\marce\Downloads\testtest.webm) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
Codec AVOption lag-in-frames (Number of frames to look ahead for alternate reference frame selection) specified for output file #0 (C:\Users\marce\Downloads\testtest.webm) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
Codec AVOption b (set bitrate (in bits/s)) specified for output file #0 (C:\Users\marce\Downloads\testtest.webm) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
Output #0, webm, to 'C:\Users\marce\Downloads\testtest.webm':
Metadata:
encoder-eng : vlc 3.0.10 stream output
encoder : vlc 3.0.10 stream output
title : testtest
Output file #0 does not contain any stream

ffmpeg.exe exited with exit code 1. That's usually bad.
If you have no idea what went wrong, open an issue on GitHub and copy paste the output of this window there.

I don't know why I cant convert an MP4 to a webM to use in this csgo panorama update. Just wanna use a good video from star wars as a background.