You can download it from GitHub.
This version adds support for MLT v6.20.0’s preview scaling.
For the MLT integration, if the resource starts with “plain:” webvfx does
automatic scaling by changing the zoom level. This works fine for content that
is simply produced or overlayed by the filter. However, content that uses the
mlt_resolution_scale is set to 1. New properties
mlt_profile_scale_height are real numbers that
reflect the new MLT scale properties used to do low-res preview scaling.
Content script can access this via
webvfx.getNumberParameter() to scale its
parameters and elements.