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Text Elements#
video compression
^0HfIiZ8S
video
multiple frames ^eWYUkycM
each frame one image ^21l7UNuy
image compression ^cC6LxZ2y
jpeg
joint photographic experts group ^B1XHjNXp
mpeg
moving picture experts group ^RrGQycCJ
jpeg image compression
grey scale image 8 bits
^lHq1SXVd
grey scale pic divided into blocks of 8X8 pixels ^7l01PKsp
- jpeg changes pictures into vector
- redundancies can be removed by compression method
^aC2Qw0Ez
DCT: Discrete cosine transform
changes 64 values so that relative relationship are kept but redundencies are revealed ^XQPWmDXs
Quantization :
- reduce no of bits needed for encoding
- divide the no. by some constant and remove the fraction
- loss some info here
- therefore jpeg is lossy ^bynrQs3f
redundant zero are removed ^92GzKd85
Image Compression : jpeg
^1GxbQalo
video compression : Mpeg ^0zbfqpiP
- compressing set of frames
- spatial compression of each frame with jpeg
- temporal compression redundant frames are removed
- tv 50 frames per sec
- eg: when someone talking most of the frame are same except for the segment of frame around lips ^Kl3pyHXb
mpeg ^0l1Andvy
i-frames ^n87ePRfM
p-frames ^yNfFzZFa
b-frames ^Mh3x0mvj
Streaming stored audio/video
^lJ8iUOFN
using web server ^Gpnmm781
media server and RTS ^1lArZPX8
web server with metafile ^H6tmpO7Z
media server ^kP9QXM2b
drawback :
audio / video large even after compression
- video played only after complete video download
^dAarHKwW
both media player and browser are using http which designed to run over tcp
- tcp not appropriate for audio / vedio
- ver web server designed for TCP ^Pe44gwtN
- media player use URL in the metafile
- downloading of audio/video from media server
using udp
^R92qjzax
- real time streaming protocol
- control protocol
- add more functionalities, playing of audio/video
- out-of-band protocol (similar second to ftp) ^s3gNw0a2
Realtime Interactive audio/video
^fmtIE84B
video conferencing communicate visually and orally ^9U5eFOkp
characteristics
- time relationship :packets arrive in delays cause jitter
- timestamp :
- playback buffer
- ordering
- multicasting
- translation high-bandwdith to lower-bandwidth
- mixing - traffic made from mutiple streams ^wGqAhGhv
Tcp not suitted for interactive traffic
^MX30AtzB
RTP(real-time transport protocol)
- handle real time traffic on internet
- stands b/w udp and application program
- provide time-stamping, sequencing, mixing facilities
- encapsulated in udp
- use even number port
- allows flow of data
^xHq4HLbA
RTP packet header format ^B6upLS2q
payload
31-H.261
32 - mpeg2 video
33-mpeg2 vedio ^6XYQA6YK
2
^tG13wpTG
1 ^lXNDl2UV
1 ^GAJ8AiJt
4bit ^NlbYl5et
1 ^Eqa3Uuz9
7 bit ^SmbksoJs
16 bit ^A7Sb310k
32 bit ^ddqcvoo3
32 bit ^8lTGQiaQ
32 bit ^jcq0KIzC
32 bit ^fJEtHYPv
32 bit ^F7VQiqHA
RTCP
- contol flow and quality of data
- recipient send feedback to sources or sources
- ^wNggt420
sender report ^QM2n8gge
receiver report
^CuiGkIrV
Source Description Message ^ufotQ6bT
Bye Message ^11DPHyAa
Application specific message ^g23c1eti
SIP(session intercation protocol)
- session Initiation protocol
- app layer protocol
- establish , manage , terminates a multi media session call
- used to create two party, multiparty, multicastparty
- independent of protocol udp, tcp, sctp
- ipaddress, emailaddress, phonenumber indentify sender and reciver
^9edQhtjX
invite ^s61etckJ
Ack ^6HzxoXHB
bye ^ji8mezcj
options ^iXqN1a2r
cancel ^Agld8PXU
register ^ir2CaZg5
Messages ^dNyW7hY8
establishing : 3 way handshake
^XcGxd7Hr
caller: INVITE
callee: reply
caller: ack
^aiBS2bmH
connection
terminating : BYE ^cHYU3o2R
SIP ^hpFbpbwe
H.323 ^jy7RXAd8
- standard designed by ITU to allow telephones ^Sk2mIY2t
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