The VideoLAN Forums

I have a video file I recorded on my Samsung S9 phone that has no file extension. I had to restart the phone to stop recording a few times. I copied the files to my hard drive. For two files, the convert/save function worked. For the third file, it only converted it to 1KB file. The original file is 464,632 KB. What am I doing wrong? Oh, Windows 11 on a Dell PC.

Please post the Media Info report of your file:
https://mediaarea.net/en/MediaInfo/Download/Windows

I hope this is what you are looking for.
General
Complete name : C:\Users\Owner\Downloads\1695084008234
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (isom/mp42)
File size : 454 MiB
IsTruncated : Yes
FileExtension_Invalid : braw mov mp4 m4v m4a m4b m4p m4r 3ga 3gpa 3gpp 3gp 3gpp2 3g2 k3g jpm jpx mqv ismv isma ismt f4a f4b f4v

Give it an .MP4 extension but this file is damaged:

IsTruncated : Yes

How do I do that and can it be repaired?

Thanks. But how can I give it an MP4 extension? I tried renaming it in WIndows but that doesn't work.

It must work but default Windows setting are hiding known extensions. Change this behaviour in Windows Explorer settings.

Thanks for all the help. I was able to add the extension. All the "free" programs to repair the file all cost like $30 to save the fixed file. NOT worth it for one recorded song.

Same problem here with a video file downloaded from Google Drive (without extension).
The file is not corrupted, I'm using VLC version 3.0.20.

With a video file without extension I can't convert to mp3.
If I add .mp4 as extension the conversion works like a charm.