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Video Transmission over Ethernet using H.263 Codec

Video Transmission over Ethernet using H.263 Codec

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  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec
  • Video Transmission Over Ethernet Using H.263 Codec

H.263 Video Codec H.263 Video Codec Presentation Transcript

  • Video Transmission Over Ethernet Using H.263 Codec | 2013 VIDEO TRANSMISSION OVER ETHERNET USING•Click to edit Master text styles –Second level H.263 CODEC •Third level –Fourth level »Fifth level Presented by: Kavisha BTBTI09124 B.Tech(I.T.)-VII sem
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 AIM OF THE PROJECTThe project aims at capturing a real time video frame •Click to edit web camera and compressing thesequence by a Master text styles –Second levelcaptured frames with H.263 codec and transmitting •Third bitthe encodedlevel stream over Ethernet, subsequentlydecoding –Fourththe receiving end for display, by the it at level »Fifth levelimplementation of codec & analyzing its performance& its image quality.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 TOOLS USEDPlatform : Linux (Red Hat Enterprise Linux 6)•Click to edit Master text stylesLanguage : C –Second levelTools Used :level Eclipse •ThirdHardware–Fourth level Webcam : PC, »Fifth level
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 WHAT IS A VIDEO?Video consists of a time ordered sequence of •Click to edit Master text stylescorrelated images called frames. –Second level •Third levelLive streaming of video refers to the sequence of –Fourth levelframes constantlylevel »Fifth received by and presented to theend user while being delivered by the stream provider.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 WHY WE NEED COMPRESSION?One movie video without compression having:••Clickxto edit Master text styles 640 480 pixels per frame –Second level• 30 frames per second •Third level• Total 90 minutes –Fourth level• Full color »Fifth levelThe total quantity of data = 167.96 GB !!How to stream this large amount of data over network?The purpose of video compression is to cram more information into less space and bandwidth.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 VIDEO COMPRESSION•Click to edit Master text styles –Second level •Third level –Fourth level »Fifth level 1. Compress and in one frame. 2. Compress the motion of in remaining frames.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 VIDEO COMPRESSION• CODEC stands for enCOder/DECoder.•Click to edit Master text styles--convert video stream into a format that takes up less –Second level space when its stored or transmitted & then decode •Third level that format into video stream again. –Fourth level »Fifth level• A device or a program that compresses a video signal is called an encoder and a device or a program that decompresses the video signal is called a decoder.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 H.263• H.263 is a real time compression & decompression algorithm for video communication at low bitrates.•Click to edit Master text styles –Second level• It gives enhanced visual quality at very low bitrates •Third level say around 28 kbps. –Fourth level »Fifth level• It is used for Video on Demand and streaming services.• It is based on using the Discrete Cosine Transform (DCT) and Motion Estimation and Compensation to remove temporal redundancies.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 VIDEO ENCODING•Click to edit Master text styles –Second level •Third level –Fourth level »Fifth level Demonstration Flow Diagram
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 VIDEO CAPTURE• Video stream is captured by means of a webcam with •Click to of SDLMaster DirectMedia Layer). the help edit (Simple text styles –Second level• Simple DirectMedia Layer (SDL) is a free cross- •Third level platform multi-media development API. –Fourth level »Fifth level• The code for video capture is written using SDL libraries and Video For Linux 2 (V4L2) specifications.• The standard file for accessing webcam on linux is “/dev/video0”.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 VIDEO CAPTURE• The web cam captures video in YUV format but for rendering it on screen its converted to RGB format.• •Click to edit Master text styles In the application it is converted to RGB(BITMAP) –Second level format using the formulae: •Third level r = y + (1.370705 * (v-128)); –Fourth level g = y - (0.698001 * (v-128)) - (0.337633 * (u-128)); »Fifth level b = y + (1.732446 * (u-128)); where, y : represents Luminance. u (Cb): is the Chroma channel, blue component. v (Cr) : is the Chroma channel, red component.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 VIDEO CAPTURE•Click to edit Master text styles –Second level •Third level –Fourth level »Fifth level
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 VIDEO FRAME FORMATSAll versions of H.263 support five standardized pictureformats:•Click to edit Master text styles –Second level •Third level –Fourth level »Fifth level• The choice of frame resolution depends on application and available storage or transmission capacity.• CIF and QCIF are popular for the videoconferencing applications.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 VIDEO ENCODING• Video coding aims at providing a compact •Click to edit Masterinformation in the video frames representation of the text styles by removing spatial redundancies that exist within –Second level the frames, and also temporal redundancies that exist •Third level between successive frames. –Fourth level »Fifth level• Each picture is divided into Macroblocks (16x16) where each macroblock consists of 4 luminance blocks and 2 spatially aligned color difference blocks. Each block consists of 8 pixels x 8 lines of luminance or chrominance.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 VIDEO FORMAT•Click to edit Master text styles –Second level •Third level –Fourth level »Fifth level
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 VIDEO ENCODING•Click to edit Master text styles –Second level •Third level –Fourth level »Fifth level
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 VIDEO ENCODING 16 × 16 Macroblocks•Click to Frame n Master text styles edit –Second level •Third levelFrame n-1 Y –Fourth level DCT, Quantization, »Fifth level Residual Zigzag, Entropy coding Cb CrMotion vector Search range
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 ENCODING PARAMETERS• Input sequence is YUV format video with frame rate•Click25fps. This is the video we get directly for of to edit Master text styles webcam. –Second level• Bitmap format is used for rendering the image on •Third level screen.–Fourth level »Fifth level• In encoder, profile is with 8x8 transform and VLC (Variable Length Coding) Entropy coding method is used.• Frame rate is initialized with 25fps.• Initialization Quantization Parameter is taken as 10.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 PACKETIZATION• Datagram Sockets are created at both ends for sending & receiving encoded video bitstream.••Clickencoded Master text styles packets of size The to edit bitstream is made into –Second to be 1300 byteslevel transmitted over network. •Third packet_struct defines the packet header.• Structure level –Fourth level »Fifth level#define DATA_SIZE1300typedef struct packet_struct{ int seq_no; int packets; int data_len;}packet_struct;
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 PACKETIZATION• The packets are formed after attaching the packet •Click toto data. header edit Master text styles –Second level• The packets are pushed into the queue to be •Third level transmitted over the network. –Fourth level PACKET QUEUE »Fifth level
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 PACKETIZATION /* to count the number of packets */ •Click to edit% data_size) styles if(data_length Master text –Second level total_packets = data_length/data_size+1; •Third level else –Fourth level total_packetslevel »Fifth = data_length/data_size;• At the receiver side the incoming packets are pushed in the queue until the complete buffer is received.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 PACKETIZATION•Click to edit Master text styles –Second level •Third level –Fourth level »Fifth level
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 PACKETIZATION•Click to edit Master text styles –Second level •Third level –Fourth level »Fifth level
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 VIDEO DECODING•Click to edit Master text styles –Second level •Third level –Fourth level »Fifth level
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 VIDEO DECODING•Click to edit Master text styles –Second level •Third level –Fourth level »Fifth level
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 OUTPUT•Click to edit Master text styles –Second level •Third level –Fourth level »Fifth level Captured Image Decompressed Image
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 COMPRESSION RATIO• The size of a single YUV frame (176x144) is about 50KB.• The captured YUV frame is converted to RGB (176x144) •Click to edit rendered for display. Bitmap image Master text styles –Second level• The size of a single RGB frame is about 75 KB. •Third level• The size–Fourth level of compressed bitstream for a single frame is ~9.6 KB. »Fifth level CR = Compressed Size / Uncompressed Size CR= 9.6 / 49.5 = 0.19 ~ 0.2• The image is thus compressed nearly by 5 times with respect to the original one.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 Quality Measurement & PSNR• •Click(Peak Signal to Noise Ratio) calculation of two PSNR to edit Master text styles images, one level –Second original and an altered image, describes how far two level •Third images are equal.• A higher–Fourth level PSNR would normally indicate that the »Fifth level reconstruction is of higher quality. . PSNR formulaMSE: Mean-Square error.x: width of image.y: height.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 Quality Measurement & PSNRThe Peak Signal to Noise Ratio (PSNR) for a QCIF Frame •Click to calculated at text styles(176x144) is edit Masterdifferent frame rates say 25 fps, –Second level30fps. •Third level Component –Fourth level PSNR(dB) »Fifth level PSNR_Y 30.74 PSNR_Cb 29.95 PSNR_Cr 30.58 PSNR at 30 fps
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 Quality Measurement & PSNR Component PSNR(dB)•Click to edit Master text styles PSNR_Y 31.16 –Second level PSNR_Cb •Third level 30.47 –Fourth level PSNR_Cr 29.79 »Fifth level PSNR at 25 fps
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 References[1] ITU-T Draft H.263, “Video Coding for Low Bit RateCommunication”, May 1996. •Click to edit Master text styles –Second level[2] Michael H. Schimek, “V4L2 (Video for Linux 2) •Third Revision 0.24”, 2008.Specifications:level –Fourth level »Fifth level [3] Sam Lantinga, “Simple DirectMedia Layer (SDL):Revision 1.2”, Loki Entertainment Software, 2007.[4] ITU Telecom.“ Video Codec Test Model Near- term,Version 8 (TMN-8), H.263 Ad Hoc Group, June 1997.EricWeitzel, “Basic Video Compression Techniques”,Ouroborros Publications, March 2004.
  • Video Transmission Over Ethernet Using H.263 Codec | 2013 References [5] Ismail Erturk, Yildiray Yalmal, “A new color image qualitymeasure based on YUV transformation and PSNR for human vision •Click to edit Master text stylessystem”, Department of Computer Engineering, Turgut Ozal –Second levelUniversity, Turkey, 2011. •Third level[6] Karel –Fourth level Rijkse, “H.263: Video Coding for Low-Bit-Rate »Fifth levelCommunication”, KPN Research, IEEE Communications Magazine,pp.42-45, December 1996.