I'd suggest
GalleryMagic* and
CyberSEO plugins to batch import these FHG and video dumps into WordPress posts and/or pages with just two mouse clicks. I mean 1000's of galleries at once from CSV and raw text dumps of ANY format! Both plugins will automatically download the original-sized pictures and/or videos to your host, crop the thumbnails, create WordPress galleries and video and/or livecam embed posts/pages, schedule them according to your preferences and generate featured images for each of them on 100% autopilot.
GalleryMagic:
CyberSEO:
* Don't buy the GalleryMagic plugin if you already own the CyberSEO 7 license, because CyberSEO 7 is able to do everything that gallery magic does + much more.