What format do video files have to be in to play in TranscriptPad?

TranscriptPad can import and play almost all videos that are compatible with the iPad. If you are having issues with the compatibility of a video file you can use the free Handbrake desktop program which is available for macOS and Windows (https://handbrake.fr) to convert the video into a compatible format. It has various presets to make the conversion process easy, with the Apple 1080p30 Surround option being a good choice for most situations. Please see this TrialPad support article for more details: https://support.litsoftware.com/what-format-do-video-files-have-to-be-in-to-play-in-trialpad