I have created a Flutter app that can take video file from phone's gallery/photos and convert it to GIF using FFmpeg. Also the generated gifs are stored in application documents directory and later they are displayed in grid list view. This video is walkthrough of the code this app.
Follow on Twitter
/ gyakhoe
Follow on Github
https://github.com/gyakhoe
App source code:
https://github.com/gyakhoe/gif_maker.git
Reference
@Fireship - • WASM + React... Easily build video ed...
https://engineering.giphy.com/how-to-...
http://ffmpeg.tv