Don't rely on a single platform. Back up 2015-era files to modern cold storage (like AWS Glacier or Google One).
Get-ChildItem *.mp4 | ForEach-Object ffmpeg -i $_.FullName -c copy -movflags +faststart "fixed_$($_.Name)" nippy user since 2015 mp4 fix
Untrunc is a specialized command-line utility designed to repair broken MP4 videos. It operates by cross-referencing your broken file with a healthy file recorded using the exact same software profile. Locate a generated by your same system. Execute the following repair command: untrunc healthy_sample.mp4 corrupt_video.mp4 Use code with caution. Don't rely on a single platform