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'''Uncompressed video''' is digital [[video]] information that has not been [[video compression|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 camera]]s. The purpose is significant higher quality allowing even [[Image scaling|resolution upscaling]]. |
'''Uncompressed video''' is digital [[video]] information that has not been [[video compression|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 camera]]s. The purpose is significant higher quality compared to [[lossy compression]] allowing even [[Image scaling|resolution upscaling]]. |
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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 [[Real-time_computing#Real-time_in_Digital_Signal_Processing|realtime]] without any missing frames causing judder. |
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 [[Real-time_computing#Real-time_in_Digital_Signal_Processing|realtime]] without any missing frames causing judder. |
Revision as of 04:32, 29 November 2012
Uncompressed video 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 significant 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.
Currently uncompressed video is supported by Nikon DSLRs with the Expeed 3 (FR) image/video processor (currently Nikon D4, Nikon D800/D800E, Nikon D600 and Nikon D5200), the Canon EOS-1D C and professional video cameras like Arri Alexa.
Characteristics
Due to the high video compression in MPEG encoding, the video quality of uncompressed video delivers even more image resolution and sharpness increase as the related Raw image format.
It has the further advantage of higher quality due to no motion blur (no motion compensation) and no compression artifacts.
Currently there is no standardized uncompressed video file format, making it necessary to store it in a proprietary or raw format, best with a related description file about the used resolution and video mode. These can be combined with lossless compression with the use of file archivers.
Lossless video compression
Lossless video compression can be delivered with a variety of video codecs. In test some codecs performed an average compression of over factor 3.[1]
Storage and Data Rates for Uncompressed Video
Formula: Uncompressed data rate = color depths * vertical resolution * horizontal resolution * refresh frequency
- Examples
24bit @ 1080i @ 30fps :24*1920*1080*30=1.39 Gbps.
24bit @ 1080p @ 60fps :24*1920*1080*60=2.78 Gbps.
The storage and data rates for uncompressed video are listed below:
525 NTSC uncompressed
8 bit @ 720 x 486 @ 29.97fps = 20 MB per/sec, or 70 GB per/hr.
10 bit @ 720 x 486 @ 29.97fps = 27 MB per/sec, or 94 GB per/hr.
625 PAL uncompressed
8 bit @ 720 x 576 @ 25fps = 20 MB per/sec, or 70 GB per/hr.
10 bit @ 720 x 576 @ 25fps = 26 MB per/sec, or 93 GB per/hr.
720p HDTV uncompressed
8 bit @ 1280 x 720 @ 59.94field = 105 MB per/sec, or 370 GB per/hr.
10 bit @ 1280 x 720 @ 59.94field = 140 MB per/sec, or 494 GB per/hr.
1080i and 1080p HDTV uncompressed
8 bit @ 1920 x 1080 @ 24fps = 95 MB per/sec, or 334 GB per/hr.
10 bit @ 1920 x 1080 @ 24fps = 127 MB per/sec, or 445 GB per/hr.
8 bit @ 1920 x 1080 @ 25fps = 99 MB per/sec, or 348 GB per/hr.
10 bit @ 1920 x 1080 @ 25fps = 132 MB per/sec, or 463 GB per/hr.
8 bit @ 1920 x 1080 @ 29.97fps = 119 MB per/sec, or 417 GB per/hr.
10 bit @ 1920 x 1080 @ 29.97fps = 158 MB per/sec, or 556 GB per/hr.
1080i and 1080p HDTV RGB (4:4:4) uncompressed
10 bit @ 1280 x 720p @ 60fps = 211 MB per/sec, or 742 GB per/hr.
10 bit @ 1920 x 1080 @ 24fps = 190 MB per/sec, or 667 GB per/hr.
10 bit @ 1920 x 1080 @ 50i = 198 MB per/sec, or 695 GB per/hr.
10 bit @ 1920 x 1080 @ 60i = 237 MB per/sec, or 834 GB per/hr.
HDMI 1.3a Specifications
According to HDMI 1.3a Spec.
Detailed timing is found in CEA-861-D or a later version of CEA-861 for the following video format timings.
Primary Video Format Timings
• 640x480p @ 59.94/60Hz
• 1280x720p @ 59.94/60Hz
• 1920x1080i @ 59.94/60Hz
• 720x480p @ 59.94/60Hz
• 720(1440)x480i @ 59.94/60Hz
• 1280x720p @ 50Hz
• 1920x1080i @ 50Hz
• 720x576p @ 50Hz
• 720(1440)x576i @ 50Hz
Secondary Video Format Timings
• 720(1440)x240p @ 59.94/60Hz
• 2880x480i @ 59.94/60Hz
• 2880x240p @ 59.94/60Hz
• 1440x480p @ 59.94/60Hz
• 1920x1080p @ 59.94/60Hz
• 720(1440)x288p @ 50Hz
• 2880x576i @ 50Hz
• 2880x288p @ 50Hz
• 1440x576p @ 50Hz
• 1920x1080p @ 50Hz
• 1920x1080p @ 23.98/24Hz
• 1920x1080p @ 25Hz
• 1920x1080p @ 29.97/30Hz
• 2880x480p @ 59.94/60Hz
• 2880x576p @ 50Hz
• 1920x1080i (1250 total) @ 50Hz
• 720(1440)x480i @ 119.88/120Hz
• 720x480p @ 119.88/120Hz
• 1920x1080i @ 119.88/120Hz
• 1280x720p @ 119.88/120Hz
• 720(1440)x480i @ 239.76/240Hz
• 720x480p @ 239.76/240Hz
• 720(1440)x576i @ 100Hz
• 720x576p @ 100Hz
• 1920x1080i @ 100Hz
• 1280x720p @ 100Hz
• 720(1440)x576i @ 200Hz
• 720X576p @ 200Hz
Pixel Encodings and Color Depth
There are three different pixel encodings that may be sent across an HDMI cable: YCBCR 4:4:4,
YCBCR 4:2:2 and RGB 4:4:4.
There are four color depths supported: 24-, 30-, 36- and 48-bits per pixel.
References
See also
External links
- Video bitrate calculator Forret
- Uncompressed Digital Video Creative Planet Network
- Uncompressed vs. Compressed Video Creative Planet Network