The only PDS to MP4 conversion that would make sense is an export of *.pds projects from Cyberlink PowerDirector and export them to a Windows Media Audio (*.wma). As far as we know, there is not other PDS to WMA conversion possible.
Convert Cyberlink PowerDirector project to Windows Media Audio.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert pds to wma on Windows
Suite of tools for video editing
Convert from pds file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.