Uncompressed video, also called Clean HDMI, is digital video information that has not been compressed, or was not processed with compression on it when the video was captured directly from a digital camera. It stands for the related data stream or the file format used by digital video cameras. The purpose is significantly higher quality compared to lossy compression, allowing even resolution upscaling.
The HDMI specification specifies several modes of uncompressed digital video. Although often HD video capable cameras include a HDMI interface for playback or even live preview, the image processor and the video processor of cameras usable for uncompressed video must be able to deliver the full image resolution at the specified frame rate in realtime without any missing frames causing judder. Therefore usable uncompressed video out of HDMI is often called "Clean HDMI".
Currently uncompressed video is supported by Nikon DSLRs with the Expeed 3 (FR) image/video processor (currently Nikon D4, Nikon D800/D800E, Nikon D600, Nikon D7100 and Nikon D5200), the Canon EOS-1D C, the Canon 5D Mark III with firmware 1.2.1 and professional video cameras (see list of video cameras supporting a raw format), which use proprietary raw video formats like CinemaDNG (open format) or ArriRaw with similarities to the raw image format.
Read more about Uncompressed Video: Characteristics, Practical Configuration and Recording, Storage and Data Rates For Uncompressed Video, HDMI 1.3a Specifications, See Also
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