: For a quick, one-off project, use web-based tools like Clideo , Adobe Express , or Kapwing . You simply upload your pieces (like "2776.mp4"), arrange them, and download the combined file.

: If you have many pieces and want to join them without losing quality (lossless), use the FFmpeg command-line tool. You can use the "concat" command to stitch files with the same codec (like H.264/AVC) together instantly.

: Files should ideally match (e.g., 30fps) to avoid audio sync issues.

To "put together" or combine video files like "2776.mp4" (assuming 2776 is a file name), you can use several free and professional tools depending on your technical comfort level. Recommended Methods for Joining MP4 Files

Before joining, ensure your files share the same technical specs for the best result: : Most modern MP4s use H.264/AVC.

: Combining a 1080p video with a 720p video might cause stretching or black bars.

: A versatile media player that also has a "Convert/Save" feature which allows you to open multiple files and "stream" them into one single output file.

Are you trying to (like 2776.mp4, 2777.mp4) or just repair a single corrupted file ? What is H.264? | Advanced Video Coding (AVC) - Cloudflare