While the filename itself is generic, files with this naming structure that gain enough search interest to warrant a report are often associated with from boards like /v/ (Video Games) or /pol/ (Politically Incorrect).
The numeric string 1591301395228 is a server-generated timestamp. On 4chan, files are automatically renamed to the time of upload to ensure unique filenames across its boards. 1591301395228.webm
.webm is an open, royalty-free media file container designed for the web. It typically uses VP8/VP9 video codecs and Vorbis/Opus audio. While the filename itself is generic, files with
