R_25_ev.mp4

All H.264 encoded videos just can be played at 25 fps - TI E2E

Identifies the file as an MP4 and lists compatible brands. r_25_ev.mp4

The actual compressed video and audio payloads. Common Technical Metadata r_25_ev.mp4

The "r_25" likely indicates a 25fps frame rate, and "ev" may refer to "event" or "exposure value," often found in automated recording systems like security cameras or automotive sensors. Container Structure r_25_ev.mp4