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

: 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.

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

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

: 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.

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

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