TRUDEF™ uses its own file extensions .FVF (Fractal Video File) and .FIF (Fractal Intra Frame). TRUDEF™ video can be compressed entirely as Intra Frames (for production editing) or as Inter Frames (for reducing file size used in distribution).
The term Intra Frame coding refers to compression techniques performed relative to image content only within the current frame, and not relative to any other frame in the video sequence. In other words, no temporal processing is performed outside of the current picture or frame. Intra frames are preferred for digital archiving since any storage media corruption will effect individual frames rather than an entire group of pictures (GOP) as is the case with Inter Frame compression. Intra Frame compression is also used in post production editing since video sequences can be split between any two frames.
There are two types of pictures (or frames) TRUDEF™ uses in video compression: I-frames and P-frames.
An I-frame is an 'Intra-coded picture', in effect a fully specified picture, like a conventional static image file. P-frames and B-frames hold only part of the image information, so they need less space to store than an I-frame, and thus improve video compression rates.
A P-frame ('Predicted picture') holds only the changes in the image from the previous frame. For example, in a scene where a car moves across a stationary background, only the car's movements need to be encoded. The encoder does not need to store the unchanging background pixels in the P-frame, thus saving space. P-frames are also known as delta-frames.