The -1pon tag is less standard but often refers to one of the following:
This is a standard MPEG-4 video container. It is widely used because it provides high-quality video with relatively small file sizes, making it the go-to format for everything from social media clips to professional archives. 091522_001-1pon.mp4
In some systems, a "1" or "-1" suffix is automatically added when a file is a duplicate or a slightly modified version of an original. The -1pon tag is less standard but often
Are you trying to track down the origin of this specific file, or 091522_001-1pon.mp4