Hi,
It is possible that the changes to your disk and the continued use of your computer have overwritten and destroyed some of the deleted data.
However, you may still be able to recover some, or possible all of your missing files.
Download Recover My Files from
Data Recovery Software to Undelete Files; Disk recovery; Recover Deleted Files.
Run a Complete File Search on the drive letter for the MPEG file type.
Good luck.