: Download VLC Media Player —it includes built-in codecs for almost every type of MP4 file.
Based on common file naming conventions, is likely a video file where the "1545" prefix refers to a specific timestamp (3:45 PM), an ID number from a camera/recording device, or a part of a sequential batch. 1545mp4
: Some models (like older Sony or Canon units) use four-digit numbering for sequences (e.g., MVI_1545.mp4). Are you having trouble playing this specific file, or Video Codec Checker | Online Test Tool - AdValify : Download VLC Media Player —it includes built-in
If the file won't play or you need to know its origin, you can check its metadata: you can check its metadata: