Error converting .mov to .webm

[peteraldridge1985]

Arguments: -i "C:\Users\Peter\Documents\Twitch\Video Overlays\Test00000000.mov" -an -c:v libvpx -crf 32 -b:v 900K -threads 1 -metadata title="Test00000000" -f webm -y "C:\Users\Peter\Documents\Twitch\Video Overlays\Test00000000.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
libswresample 0. 18.100 / 0. 18.100
--- FFMPEG HAS EXITED ---
libpostproc 52. 3.100 / 52. 3.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 001fdfe0] Could not find codec parameters for stream 0 (Video: none (AVdh / 0x68645641), 1920x1080, 659942 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Users\Peter\Documents\Twitch\Video Overlays\Test00000000.mov':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Blackmagic Design DaVinci Resolve
Duration: 00:00:07.94, start: 0.000000, bitrate: 662249 kb/s
Stream #0:0(eng): Video: none (AVdh / 0x68645641), 1920x1080, 659942 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc (default)
Metadata:
handler_name : Core Media Data Handler
timecode : 00:00:00:00
Stream #0:1(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, stereo, s32, 2304 kb/s (default)
Metadata:
handler_name : Core Media Data Handler
Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
Metadata:
handler_name : Core Media Data Handler
timecode : 00:00:00:00
[buffer @ 04956100] Unable to parse option value "-1" as pixel format
Last message repeated 1 times
[buffer @ 04956100] Error setting option pix_fmt to value -1.
[graph 0 input from stream 0:0 @ 04956080] Error applying options to the filter.
Error opening filters!

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.