Add filename to the title metadata for all video files in a directory

setTitleFromFilename.sh

#!/usr/local/bin/zsh

for entry in *."$1"
do
  Filename=${entry%.*}
  echo "setting title -> " $Filename
  FileTitle=$(exiftool -s -Title "$entry" | awk '{print $3}');
  echo "file title: " $FileTitle
  if [ "$FileTitle" = "$Filename" ]; then
    echo "File title is the same as filename, skipping..."
  else
   exiftool -P -overwrite_original -Title="$Filename" $entry
  fi
done

This needs exiftool which can be downloaded from https://exiftool.org/
Call this file inside a folder with all your video files with the extension of the files. For example, if extension is mp4 then run:
-> ./setTitleFromFilename.sh mp4

Should also work for any other type of file that has Title in metadata.