The "FRENCH HDTV" tag in the title indicates specific technical and regional details for this version:
This indicates the source of the video was a high-definition television broadcast. These files are typically encoded in formats like H.264 or x264 to balance high visual quality with a manageable file size.
9-1-1 is a massive international hit, and its popularity in French-speaking regions (such as France, Belgium, and Canada) is significant. In France, the series is titled and has historically been broadcast on networks like M6 . The release of episodes in "FRENCH HDTV" allows local fans to follow the high-octane drama of the Los Angeles first responders in their native language shortly after the original U.S. broadcast.