: Use a slow fade (3+ seconds) for dramatic endings.

If you are trying to apply this effect or manipulate the file, here are the most effective tools: 1. Command Line (FFmpeg)

For quick, automated transitions without a full editor, use FFmpeg :

: Usually serves as a "buffer" clip in video editing projects. 💡 🛠️ How to Use and Edit

: -filter:v 'fade=out:21000:50' (starts at frame 21,000). Combined : -filter:v 'fade=in:0:50,fade=out:21000:50' . 2. Desktop Video Editors

: Seamlessly shifts a video from full visibility to a total black screen.