Changes between Version 7 and Version 8 of Other/Summer/2015/hVideo
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- Jul 13, 2015, 9:42:45 PM (9 years ago)
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Other/Summer/2015/hVideo
v7 v8 1 = = Dynamic Video Encoding ==1 = Dynamic Video Encoding = 2 2 3 3 [[TOC(Other/Summer/2015*, depth=3)]] 4 4 5 == = Introduction ===5 == Introduction == 6 6 7 7 Live-streaming video from a device to the Internet in an efficient manner can be a tricky task. The concept of video-streaming itself is simple; the device records whatever is going on and then streams the video file information live to a video-hosting website. The problem arises with the nature of internet/data/WiFi connections. Having an unstable connection will result in a low, partially corrupted, and blurry video file on the streaming server. The original video file can always be uploaded later on to wherever the video was streamed to, but just simply re-uploading the same video file is a waste of bandwidth and time. Bits and pieces of the video file were already sent to the streaming server during the live-streaming process; why not use the information previously sent to figure out and upload whatever is missing? That's the goal and name of our project: Dynamic Video Encoding. 8 8 9 == = What We've Accomplished So Far ===9 == What We've Accomplished So Far == 10 10 11 -Attempt ORBIT tutorials.[[BR]] 12 -Establish WiFi connectivity between two nodes in the ORBIT network.[[BR]] 13 -Simulate video corruption using a network emulator (netem) by transmitting videos from one node to another with varying degrees of packet loss.[[BR]] 14 -Establish a working knowledge of Ruby.[[BR]] 11 * Attempt ORBIT tutorials. 12 * Establish WiFi connectivity between two nodes in the ORBIT network. 13 * Simulate video corruption using a network emulator (netem) by transmitting videos from one node to another with varying degrees of packet loss. 14 * Establish a working knowledge of Ruby. 15 15 16 == = Goals ===16 == Goals == 17 17 18 -Automation of bash script procedures via Ruby scripts.[[BR]] 19 -Dynamic adaptive streaming over HTTP (DASH).[[BR]] 18 * Automation of bash script procedures via Ruby scripts. 19 * Dynamic adaptive streaming over HTTP (DASH). 20 20 21 == = Background Information ===21 == Background Information == 22 22 23 -Anatomy of a Video File:[[BR]] 23 === Anatomy of a Video File === 24 24 25 1. Container [[BR]]26 Defined by file extension[[BR]] 27 Holds various audio/video streams[[BR]] 28 Specifies contained encoding scheme[[BR]] 29 Encoding scheme defines algorithm(s) used to encode/decode video[[BR]] 25 1. Container 26 * Defined by file extension 27 * Holds various audio/video streams 28 * Specifies contained encoding scheme 29 a. Encoding scheme defines algorithm(s) used to encode/decode video 30 30 31 2. Content stream [[BR]]32 Contains encoded audio/video streams[[BR]] 33 Limits video use to only specific codecs[[BR]] 31 2. Content stream 32 * Contains encoded audio/video streams 33 * Limits video use to only specific codecs 34 34 35 What is a CODEC?[[BR]] 36 Encoder-Decoder[[BR]] 37 Algorithms defined in compression standard[[BR]] 38 Can sometimes encode/decode several compression algorithms[[BR]] 39 Popular compression algorithms include JPEG/MPEG family[[BR]] 35 === What is a CODEC? === 36 1. Encoder-Decoder 37 * Algorithms defined in compression standard 38 * Can sometimes encode/decode several compression algorithms 39 * Popular compression algorithms include JPEG/MPEG family 40 40 41 === People === 41 === H.264 Compression Algorithm === 42 1. Defined in MPEG-4 Part 10: Advanced Video Coding 43 * Implements many common image/video compression techniques 44 a. Discrete Cosine Transform (DCT) 45 b. Motion Compensation 46 47 === Scalable Video Coding === 48 1. Uses various methods to split a high quality bit stream into component layers 49 * Temporary Scalability 50 * Spatial Scalability 51 * SNR Scalability 52 2. Decoder recombines selected layers to form output video stream 53 54 [[Image()]] 55 56 == People == 42 57 Professor Anand Sarwate[[BR]] 43 58 Professor Roy Yates[[BR]]
