Files with temp_video extension are temporary files that contain video file, usually recording or cached video. Common on older Samsung devices.
TEMP_VIDEO file extension - Android temporary video file
What is temp_video file? How to open temp_video files?
File type specification:
File extension temp_video is known to be used for a temporary video file created on some Android devices, most typically on Samsung smartphones since 2012. Often found when users are recording something, but the recording app glitches and doesn't save the video properly.
Renaming the suffix to mp4 or some other video doesn't typically work, but some users had success with VLC player that supposedly can somehow repair and recover the recording.
