Use Handbrake or VLC Media Player to convert the file if it is not playing in certain applications [1, 2].
A clip from a media project, training video, or specific video library. RCT-721.mp4
(e.g., Is it security footage, a project file, or a corrupted file?) Use Handbrake or VLC Media Player to convert
Depending on what you need to do with this video, here are the most useful features and tools commonly used: Use LosslessCut to trim, cut, or merge segments
Use ExifTool or ffmpeg to view or edit the creation date, camera model, or file information embedded in the MP4 file.
Use LosslessCut to trim, cut, or merge segments of the MP4 without re-encoding, preserving quality [3].
Based on my search results, there is no widely known or specific software feature, article, or technical document directly covering a file named "RCT-721.mp4".