Uncompressed video
 | This article needs additional citations for verification. (March 2023) |
Uncompressed video is
Some
Uncompressed video should not be confused with raw video. Raw video represents largely unprocessed data (e.g. without demosaicing) captured by an imaging device.
Recording
A standalone video recorder is a device that receives uncompressed video and stores it in either uncompressed or compressed form. These devices typically have a video output that can be used to monitor or playback recorded video. When playing back compressed video, the compressed video is uncompressed by the device before being output. Such devices may also have a communication interface, such as Ethernet or USB, which can used to exchange video files with an external computer, and in some cases control the recorder from an external computer as well.
Recording to a computer is a relatively inexpensive alternative to implementing a digital video recorder, but the computer and its video storage device (e.g.,
HDMI, DVI and HD-SDI inputs are available as
Software for recording uncompressed video is often supplied with suitable hardware or available for free e.g. Ingex.[8]
Network transmission
Wireless interfaces such as Wireless LAN (WLAN, Wi-Fi), WiDi, and Wireless Home Digital Interface can be used to transmit uncompressed standard definition (SD) video but not HD video because the HD bit rates would exceed the network bandwidth. HD can be transmitted using higher-speed interfaces such as WirelessHD and WiGig. In all cases, when video is conveyed over a network, communication disruptions or diminished bandwidth can corrupt the video or prevent its transmission.
Data rates
Uncompressed video has a constant bitrate that is based on pixel representation, image resolution, and frame rate:
- refresh frequency [citation needed]
For example:
- 16-bit, 480i @ 24 Mbit/s
- 24-bit, 480p @ 30 fps: 24 × 640 × 480 × 30 = 221 Mbit/s.
- 24-bit, 720p @ 30 fps: 24 × 1280 × 720 × 30 = 663 Mbit/s.
- 24-bit, 720p @ 60 fps: 24 × 1280 × 720 × 60 = 1.32 Gbit/s
- 24-bit, 1080i @ 60 fps: 24 × 1920 × 540 × 60 = 1.49 Gbit/s.
- 24-bit, 1080p @ 60 fps: 24 × 1920 × 1080 × 60 = 2.98 Gbit/s.
- 24-bit, 4K UHD@ 60 fps: 24 × 3840 × 2160 × 60 = 11.9 Gbit/s.
- 24-bit, 4K UHD @ 120 fps: 24 × 3840 × 2160 × 120 = 23.8 Gbit/s.
- DCI 4K@ 144 fps: 48 × 4096 × 2160 × 144 = 61.1 Gbit/s.
The actual data rate may be higher because some transmission media for uncompressed video require defined blanking intervals, which effectively add unused pixels around the visible image.
See also
- Data compression
- DPX and MXFfiles – used in professional video files systems
- List of cameras supporting a raw format
- List of codecs § Lossless video compression
- Nikon Expeed Video processor
- TIFF files – used in AV and professional video files systems
- Uncompressed audio
Notes
- ^ Most of the time color depth can be calculated as 3 × single color depth. For example, values of a single color can be represented with a range from 0 to 255 (8 bits) which gives a total color depth as 3 × 8 = 24.
- ^ Interlaced video formats transmit every other line, half the picture content, per field period. Two fields are required for a full frame so the vertical resolution is halved in this calculation.
References
- ^ Using Uncompressed Audio and Video Streams Microsoft
- ^ Compare USB Video Grabbers Epiphan
- ^ Intensity models Blackmagic
- ^ HD-SDI Express/34 Imperx
- ^ OEM video card for 8-10-12-bit HD-SD SDI digital video to PCI Express Deltacast
- ^ Capture Card Series Magewell
- ^ DeckLink models Blackmagic
- ^ Ingex Studio - Multi-camera Tapeless Recording
External links
- Video bitrate calculator
- Uncompressed Digital Video, Creative Planet Network
- Uncompressed vs. Compressed Video, Creative Planet Network
- Master Guide to Rigging a Nikon D800 or D800E for Video, Wolfcrow