This white rectangle controls which row in a menu is highlighted during THP playback, for synchronization purposes. For example, some of the videos shown during menus will have a white rectangle move at integral positions at each multiplicity within this padding space. This padding is not only used to meet the specification, but sometimes used for control information. Often times the size of the subvideo array will not be enough to meet the specification, so padding is added to the bottom of the THP video array. As required by the file format specification, THP video files must have their dimensions be a multiple of 16px. The THP video files in Mario Kart Wii tend to be an array of multiple subvideo cells inside, with each cell playing back several other videos in multiple time chunks ("multiplicities").
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It can crop the THP video files (both physically and in terms of time length), and then convert them to MP4 (H.264 codec) video files, to WAV files (for videos with audio), and padding to BMP files. Thwimp can also view MKWii's THP files, as well as convert them to everyday video files. Thwimp can show the hard-coded information about how each THP file is formatted in Mario Kart Wii. Encoding JPG frames + WAV file into THP videos.Written in Visual Basic (from Visual Studio 2010 IDE), the Thwimp application calls some FOSS and other command line tools (not included) "from arms length" via the Command Prompt to perform its tasks. Thwimp is a hybrid GUI/CLI Windows utility which allows users easily to view, to rip, and to encode Nintendo THP video files for Mario Kart Wii (and for other GCN/Wii games, to an extent).