![]() ![]() Storage and data rates for Uncompressed VideoĬonstant bitrate formula: Uncompressed data rate = color depths * vertical resolution * horizontal resolution * refresh frequency ExamplesĢ4-bit 1080i 60 fps: 24× 1920x1080*60/2=1.49 Gbit/s.Ģ4-bit 1080p 60 fps: 24× 1920x1080*60=2.99 Gbit/s. However, any disruption or bandwidth decrease of the wireless connection will reduce quality, or even stop the video recording. The Wireless Gigabit Alliance also aims to use a 60 GHz wireless link. The WirelessHD interface, however, which uses a 60 GHz wireless link, can transmit uncompressed digital video. ![]() Wireless interfaces such as Wireless LAN (WLAN, Wi-Fi), WiDi, Wireless Home Digital Interface (WHDI), can be used to transmit uncompressed digital video at lower resolutions, but typically not at HD resolutions as even requires a 1.2 Gbit/s data rate, which exceeds the maximum bandwidth of these interfaces (e.g., IEEE 802.11ac). Software for uncompressed video is often supplied with suitable hardware or available for free: Ingex ( open source). HDMI, DVI and HD-SDI inputs are available as PCI Express (partly multi-channel) or ExpressCard, USB 3.0 and Thunderbolt interface also for 2160p ( 4K resolution). Hard disk drives have to be fast solid-state drives (SSDs) and/or RAID to be capable of the data-rate of HD videos and/or multiple channels. Disconnection of not needed computer networks and increasing the process priority of the recording realtime process often helps to use most of the computer speed. Any other significant program activity including background processes – for example not needed Windows startup processes (use for example Autoruns) or Windows services (use Service Control Manager), including automatic updates or virus scanners – may disrupt, distort or stop the video recording. ![]() Recording to a computer enables low-cost to highest performance solutions for laptop or desktop computers, but the computer should be prepared as it must act like a real-time operating system (RTOS). 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. When playing back compressed video, the compressed video is uncompressed by the device before being output. These devices typically have a video output which can be used to monitor or playback recorded video. التسجيل Standalone recordersĪ standalone video recorder is a device that receives uncompressed video and stores it in either uncompressed or compressed form. In test some codecs performed an average compression of over factor of 3. Lossless video compression can be delivered with a variety of video codecs. The built in video interface in cameras is mostly an HDMI or, in professional cameras, a serial digital interface (SDI or HD-SDI). These files can be combined with lossless compression with the use of file archivers. This makes it necessary to store it best with a related description file about the used resolution and video mode. السماتĬurrently there is no standardized lossless video file format except for HDMI, which uses the YCbCr and RGB formats listed below. 4 Storage and data rates for Uncompressed Video.
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