Xiaoying_video_1629617123662mp4 -

This long number is a Unix timestamp , representing the exact time the video was created in milliseconds.

It is likely optimized for mobile viewing (9:16 aspect ratio). XiaoYing_Video_1629617123662mp4

This translates to "Little Shadow" or "Little Film." It is the parent company (QuVideo) and the original Chinese brand name for VivaVideo [1]. This long number is a Unix timestamp ,

Because it was produced by VivaVideo, it is almost certainly a user-generated mobile video created on a smartphone, likely for social media platforms like TikTok, Instagram, or Douyin. Given the date (August 2021), it might be a summer-themed video, a holiday recap, or a creative edit with music and transitions. Because it was produced by VivaVideo, it is

This file is a "time capsule" from August 2021, representing a specific moment in someone's life—a summer trip, a family event, or a creative project—captured and edited on their phone.