Some information for frequently used digital video terms for users who are not deeply familiar with digital video technologies.
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Standard Definition
Standard-definition television (SDTV) is a television system that uses a resolution that is lower than HDTV (720p and 1080p) or enhanced-definiton television (EDTV - 480p). The two common SDTV signal types are 576i, derived from the European-developed PAL and SECAM systems; and 480i based on the American NTSC system.
NTSC
NTSC,(named for National Television System Committee) is the analog TV standard that is used in most of North America, parts of South America and Pacific. It is developed in 1940s, featuring 525 lines, 60 fields per second as the standard (480i, 29.97 fps). Please note that, as a result of the market going to digital, big majority of over-the-air NTSC transmission is turned off in USA in 2009 and in Canada and most others in 2011.
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- Occupies less disk space, results in substantially lower costs.
- Reading, writing and file transferring is faster.
- The order of bytes is independent.
Disadvantages:
Requires computing resources, the more complex the algorithm the more resources required.
- Errors may occur while transmitting data.
- Loss in video quality, generation losses
- Video needs to be decompressed to be usable.
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V: Streaming Protocols
Media streaming is the act of transmitting compressed audiovisual content across a private or public network (like the Internet, a LAN, satellite, or cable television) to be processed and played back on a client player (such as a TV, smart phone or computer) while enabling real time or on-demand audio, video and multimedia content.
UDP
User Datagram Protocol (UDP) (designed in 1980) is one of the core members of the Internet protocol suite, the set of network protocols used for the Internet. With UDP, computer applications can send messages, in this case referred to as datagrams,to other hosts on an IP network without prior communications to set up special transmission channels or data paths.
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Real Time Messaging Protocol (RTMP) was initially a proprietary protocol developed by Macromedia for streaming audio, video and data over the Internet, between a Flash player and a server. Macromedia is now owned by Adobe, which has released an incomplete version of the specification of the protocol for public use. While the primary motivation for RTMP was to be a protocol for playing Flash video, it is also used in some different other applications.
RTMPS
RTMPS, which is RTMP over a Transport Layer Security (TLS/SSL) connection.
RTSP
The Real Time Streaming Protocol (RTSP) is a network control protocol designed for use in entertainment and communications systems to control streaming media servers. The protocol is used for establishing and controlling media sessions between endpoints. Clients of media servers issue VHS-style commands, such as play, record and pause, to facilitate real-time control of the media streaming from the server to a client (Video On Demand) or from a client to the server (Voice Recording).
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