Removing Metadata Title in mp4 files
You can try FFMpeg.  There are examples showing how to strip all metadata and removing just a single item isn't much different.
Try
ffmpeg -i in.mp4 -metadata title= -c:v copy -c:a copy out.mp4
This can also be done with exiftool as of version 11.39. Exiftool can also do it in batch without need of a script.
exiftool -ext mp4 -Title= /path/to/files/
This command creates backup files.  Add -overwrite_original to suppress the creation of backup files.  Add -r to recurse into subdirectories.