Image files- Up to 200 MB.
Video files- Up to 200 MB with no length limitation.
Audio files- For initial upload up to 200 MB with a 2 hour length limitation. For use within the editor a 10 minute length limitation.
In other words, if you upload a 1 hour podcast into Headliner you would then select 10 minutes or less of audio out of that 1 hour to make your video.