IPTV Video Compression
IPTV Video Compression
The industry standard is currently MPEG-2 Video Compression. Although MPEG-4 Video Compression equipment is available, it is very expensive and the standard has not been yet agreed by the IPTV major players. |
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| Bandwidth Calculation (Case study)
Trunk Network: 1 Gbit/s User Segment: 100 Mbit/s Switches: IGMP + QoS Cabling: Min CAT6 [<90m CAT6, [>100m MM Fiber, [>550m SM Fiber] IP protocol need (3.5%) : 35 Mbit Available BW : 1000 – 35 = 965 Mbit 100 channels DVD quality channel need MPEG2 SD: 100 X 3.8 Mbit = 380 Mbit , Free: 585 Mbit 20 channels HDTV MPEG2 HD: 20 X 20 Mbit = 400 Mbit, Free: 565 Mbit Video On Demand 3.8 x Max number of concurrent users |
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Video on demand
Video on Demand (VOD) or Audio Video on Demand (AVOD) systems allow users to select and watch/listen to video or audio content on demand.
VOD systems either stream content through a set-top box, allowing viewing in real time, or download it to a device such as a computer, digital video recorder, personal video recorder or portable media player for viewing at any time. The majority of cable- and telco-based television providers offer both VOD streaming, such as pay-per-view, whereby a user buys or selects a movie or television program and it begins to play on the television set almost instantaneously, or downloading to a DVR rented from the provider, for viewing in the future.
Internet Telephony
Internet telephony refers to communications services — voice, facsimile, and/or voice-messaging applications — that are transported via the Internet, rather than the public switched telephone network (PSTN). The basic steps involved in originating an Internet telephone call are conversion of the analog voice signal to digital format and compression/translation of the signal into Internet protocol (IP) packets for transmission over the Internet; the process is reversed at the receiving end.