Based on the filename provided, is a video file generated by VivaVideo , a popular mobile video editing app [1].
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. XiaoYing_Video_1629617123662mp4
The video probably features music, text overlays, transitions, and stickers. Based on the filename provided, is a video
Depending on the app version, it might have a "VivaVideo" watermark, though this can usually be removed. 3. A Time Capsule Based on the filename provided
Here is an interesting look at the context of this type of file: 1. The Story Behind the Name