The other HTML-based filters demonstrate doing JavaScript animation outside of Web Animations API using the WebVfx JavaScript extension (to synchronize the animation with the time in Shotcut) and to demonstrate various HTML graphical techniques using canvas and WebGL. Beware that you can easily hang Shotcut with a bad script. It also comes with a template called “Blank with Web Animations” that you can use to create your own by using the visual editor to lay down some basic content and then switch to the Source tab to put in some custom JavaScript for the animation. The Overlay HTML filter comes with a template called “Simple Scroll” that uses this to show how to make a basic animation of the entire document. Shotcut comes with a fairly old version of WebKit that does not support everything and some things in CSS require using a “-webkit-” prefix. There are all sorts of polyfills for various new HTML5 capabilities to make them compatible across browsers. The W3C web committee has proposed a new way of producing javascript animations that mimic and extend those produced by CSSĪnd there is a javascript library that does this. It important not to rush it as I want to make it as easy as possible for people with little or no coding experience to use - watch this space. I hope then to be able to provide documentation and code for people to use for their own animations within the next week or so. I shall be making the the filter available for people to use within the next day or so. I’ve been chasing a problem for the last week and finally found the reason for it only this morning (thanks to Dan for pointing me in the right direction). ![]() I have been “messing about” with this for a couple of weeks now, with the aim to provide a relatively simple way for users of Shotcut to convert CSS animations that are readily available on the web to use this Javascript interface to translate these into filters to use within Shotcut. TechRadar Verdict A free, regularly updated multi-platform video editing application, filled with interesting ideas, powerful features, and the odd niggle. The W3C web committee has proposed a new way of producing javascript animations that mimic and extend those produced by CSS and there is a javascript library that does this. But it is too rigid and I’ve been looking for an alternative for a while. ![]() My webvfx framework ( was the first attempt to produce some useful animations for people who weren’t experts at coding javascript. They don’t work! You need to convert the CSS animation to animation using Javascript and then use the Overlay HTML filter with the MLT webvfx library to synchronise the animation frames with the video frames. The problem with CSS animation, a lot of examples of which are on Codepen, is that there is no way to synchronize the CSS animation with the video frames that Shotcut deals with.
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