If your request is for creative or editorial content about this specific file (e.g., for a technical blog or video editing guide), here are key themes to explore:

: This is the most effective tool for fixing corrupted MP4 headers. It repairs the file by borrowing a clean header from a healthy clip recorded with the same settings. You can find it on GitHub .

If this video is showing a truncated duration or failing to play entirely, you can use these methods to restore the "long piece" of the original content:

: You can attempt a quick repair by using the "Convert / Save" feature in VLC Media Player. Selecting a standard profile like Video - H.264 + MP3 (MP4) can sometimes rebuild a garbled container.

: Often, "missing" parts of a video are due to Variable Frame Rate (VFR) or unsupported codecs like HEVC. Converting the file to a constant frame rate (CFR) using Handbrake or Shutter Encoder can force the software to recognize the entire clip.

: Sometimes the MP4 container itself is damaged, reporting a shorter duration than what is actually in the stream. Using ffmpeg or ffprobe can help you verify the actual stream duration versus what the container claims. Context for "Long Piece" Content