mrv2 v1.2.1

v1.2.1

• Fixed codec support (libvpx, dav1d and Svt-Av1) which had gotten broken due
  to new way of building FFmpeg.
• Fixed scrubbing behavior to be smooth when there's no audio. If there's
  audio the default behavior is to play the movie while scrubbing so audio
  can be heard, unless Preferences->Playback->Scrub With Audio is off.
• Fixed Settings->Gigabytes display resetting to the maximum memory even if the
  setting was actually using much less.
• Improved scrubbing behavior when audio is played and the mouse button is not
  released.
• Fixed Python ocioIcs(), ocioIcsList(), ocioView(), ocioViewList() to not
  return paths with '/' at the beginning.
• Made session (.mrv2s) files use OCIO names for default OCIO ics, view and
  look.
• Fixed HUD when saving images or movies not being correctly turned off.
• Added View->OCIO Presets to store and retrieve OCIO configurations.
• Fixed Background in OCIO Presets window on Windows 10.
• Fixed VP9 encoder to use .mp4 muxer instead of .webm as it was failing.
• Fixes STUDIOPATH variable so that it is used only with OCIO presets and
  Path Mapping.
• Fixed command-line seek value when starting a video.
• Fixed reverse playback when starting the video from the middle.
• Fixed rounding errors on reverse playback.
• Improved packaging size on Windows.