Missing 2.2 GB of space on my micro SD card
If there were problems with the file system (which your error message suggests), broken files may have been "re-allocated". For such things, *nix systems have a special directory on each file system, usually called LOST+FOUND or, on FAT file systems, LOST.DIR. Whenever things could not be "assigned to a file", they are placed there with some "cryptic" names.

So I'd suggest you mount the card on your Linux PC again, and check for that directory. If there's something in that directory, that could be the "broken" video files, and you simply could delete them to re-gain your space.