Could not open error · Issue #19 · SuslikV/untrunc-w - GitHub

: Many users encounter this filename when using video repair tools like untrunc-w on GitHub to fix broken MP4 files from cameras that didn't save correctly.

: If the file won't play, it may be "truncated" (unfinished). Use a tool like the VLC Media Player which can often play partially damaged files.

: Check the metadata (Right-click > Properties > Details on Windows) to see the "Date Modified" or "Camera Model." This will tell you exactly when and where the video was created.