Convert Autodesk FLI to vtt

Download and install the latest version of Filestar.
Right click on one or more Fli file(s) on your desktop and select Convert with Filestar.
Type convert to vtt in the search box.
Press Convert.

What is the difference between Autodesk FLI and .vtt?

Name: Autodesk FLI; WebVTT
Extension: .fli; .vtt
Format: Binary; Text
Category: Raster Image; Subtitles
Developer: Autodesk; W3C
Description: WebVTT (Web Video Text Tracks) is a text file format that is used to store subtitles and captions for online video content. It is supported by many web browsers and can be used to add captions and subtitles to HTML5 videos.
MIME Type: text/vtt
Sample: sample.vtt
Wikipedia: .vtt on Wikipedia