The Slow Motion Video FX app is a powerful tool that allows users to easily convert any video into a slow motion or fast motion video. With this app, users can selectively change speeds at multiple parts of the same video, and preview their creations in fast and slow motion before saving them without losing video quality. The app supports different formats of video and offers fast processing and best quality output.

To use the app, users simply need to select a video from their gallery, photos, or files, and long press on the video timeline to add a speed selector. They can add multiple speeds on the same video and mix them up at different time segments of the video. The app offers intuitive controls for adding selectors from the video timeline, and users can adjust the start and end time of the speed selector by simply dragging the thumbs on the timeline.

The Slow Motion Video FX app also offers a range of features, including a background process feature, notification feature, and the ability to share videos directly from the app on social media. Users can preview their slow motion and fast motion videos before saving them, and the app offers auto-play and mute/unmute options during preview. With the 'Notify me when completed' feature, users can process their videos in the background and receive a notification when the process is complete.

Overall, the Slow Motion Video FX app is a great tool for creating impacting videos by changing speeds. With its user-friendly interface and powerful features, it is a must-have app for anyone looking to create high-quality slow motion and fast motion videos.