I there a way when saving converting to PDF an existing PPTX file that contains videos keep them as videos in the PDF? By default, Aspose inserts just an image where was the vdeo in the original PPTX file.
At the moment, Aspose.Slides does not have such a capability to export videos to PDF so that they play. I linked this forum thread to an appropriate task with ID SLIDESNET-36963 in our tracking system. You will be notified when this feature is implemented.