If the file is named exactly jur153mp4 (no dot), rename it to jur153.mp4 (insert the dot before mp4).
To strip unnecessary data or change container format without re-encoding: jur153mp4
ffmpeg -i jur153.mp4 -map 0 -c copy jur153_clean.mp4
To convert to MKV (useful if MP4 is corrupted): If the file is named exactly jur153mp4 (no
ffmpeg -i jur153.mp4 -c copy jur153.mkv
If you need the title, cast, release date, or cover art for JUR153: To convert to MKV (useful if MP4 is
Video conversion utilities (like HandBrake, FFmpeg, or VLC’s convert/save feature) sometimes create temporary working files named with internal process IDs. If the conversion was interrupted, jur153mp4 could be a leftover temporary file.