1. Multimedia Content in the Internet: Synchronization, Processing & Delivery Introduction 3/11/2016
Vasilis Maglaris
Mary Grammatikou
Dimitris Kalogeras

2. Outline
Introduction
Video coding (H264, MPEG-4, DivX codecs), description of multimedia content (metadata standards, RDF, SAML), containers (AVI, MP4, FLV)
Synchronization of multimedia applications (SMIL, HTML5), related tools (Mozilla Popcorn) and platforms (NETMODE Synchronized eLearning Content – SeLCont)
Multimedia content delivery in the Internet: Content Delivery Networks CDNs, real time streaming, video on demand servers/clouds, multimedia platforms & video service providers (YouTube, Wowza, Wistia), Massive Open On-Line Courses (MOOCs) - the Coursera business model
CDN performance analysis and simulation (quality of experience, queuing models), simple video source models, advanced long-term memory models
Fixed- Mobile Convergence: Multimedia applications in smart phones/tablets, Ultra High Definition TV (4Κ) in optical high-speed networks
Term project (to be agreed with the course coordinator)

3. What is Video Format. https://library. rice
Video formats involve two distinct, and very different technology concepts:
Containers (sometimes called wrappers)
Codecs (short for coder/decoder). Codecs are used within a container

4. What is a Container. http://en. wikipedia
The container describes the structure of the file:
where the various pieces are stored
how they are interleaved
which codecs are used by which pieces.
It may specify an audio and/or video codec
It is used to package the video & its components (audio/metadata) and is identified (usually) by a file extension such as .AVI, .MP4 or .MOV.

5. Most Common Containers http://en. wikipedia
AVI (Audio Video Interleave): a Windows’ standard multimedia container.
MPEG-­‐4 Part 14 (known as .mp4): is the standardized container for MPEG-­‐4.
FLV (Flash Video): the format used to deliver MPEG video through Flash Player.
MOV: Apple‘s QuickTime container format.
OGG, OGM & OGV: open-­‐standard containers.
MKV (Mastroska): another open-­‐specification container that you've seen if you've ever downloaded anime.
VOB (DVD Video Object): It's DVD‘s standard container.
ASF: a Microsoft format designed for WMV and WMA—files can end in .wmv or .asf

6. What is a Codec. http://en. wikipedia
A codec (short for "coder/decoder") is a way of encoding audio or video into a stream of bytes. It is the method used to encode the video and is the main determiner of quality. Methods: Intra-frame (M-JPEG…), Inter-frame (MPEG 2, 4)

7. Most Common Codecs
MPEG (Moving Pictures Expert Group): three video formats, MPEG 1, 2, and 4.
MPEG-­‐1: Old, supported by everything (at least up to 352x240), reasonably efficient. A good format for the web.
MPEG-­‐2: A version of MPEG-­‐1, with better compression. 720x480. Used in HDTV, DVD, and SVCD.
MPEG-­‐4: A family of codecs, some of which are open, others Microsoft proprietary.
H.264: Most commonly used codecs for videos uploaded to the web. Part 10 of the MPEG-­‐4 codec.
M-JPEG (Motion JPEG): Used by video-capture devices (digital cameras, IP cameras, webcams), non-linear video editing systems, QuickTime.
WMV (Windows Media Video): A collection of Microsoft proprietary video codecs. Since version 7, it has used a special version of MPEG4.
RM (RealMedia): a closed codec developed by Real Networks for streaming video and audio.
DivX: in early versions, essentially an ASF (incomplete early MPEG-­‐4) codec inside an AVI container; DivX 4 and later assume complete MPEG-­‐4 codecs.

8. Container - Codec
A container is the file itself while codec is its content.
Most container formats can hold many codecs. For example a .MOV container can hold almost any kind of codec data.
The same goes for .MP4 and even .AVI files can hold a wide variety of codecs as their contents. In no way does the container decide the quality or features of the video itself, that is up to the codec.
The proper way to describe video is to indicate both: .MOV file containing H.264 data; .AVI file containing DivX data.

9. Container – Codec

10. File Size & Quality http://www.dr-lex.be/info-stuff/videocalc.html
Frames per Second (FPS): the standard is 29.97; increasing the FPS allows for more images per second thus a smoother image; decreasing the FPS will make the video a bit choppy and not nearly as smooth.
Bitrate: number of bits that are transmitted over a set length of time. Your overall bitrate is a combination of your video stream, audio stream & metadata in your file with the majority coming from your video stream. The higher the bit rate, the better the quality, the bigger the size.
Resolution: number of pixels present in the images of the video. This determines whether your video is standard definition or high definition. The higher the resolution, the clearer the image, the bigger the file.
Video File: depends on resolution, FPS, length
Compressed H.264: 1920x1080 / 23,98 Frame Rate / 1h length ~ 34GB
Uncompressed, Clean HDMI: 1920x1080 / 23,98 Frame Rate / 1h length ~ 500GB

11. Video Resolution Standards

12. Trends & Analysis 2013 – 2018 http://www. netmode. ntua
Every second, nearly a million minutes of video content will cross the network by 2018.
Globally, IP video traffic will be 79 percent of all IP traffic (both business and consumer) by 2018, up from 66 percent in 2013.
Internet video to TV grew 35 percent in It will continue to grow at a rapid pace, increasing fourfold by 2018.
Consumer VoD traffic will double by The amount of VoD traffic in 2018 will be equivalent to 6 billion DVDs per month.
Content delivery network traffic will deliver over half of all Internet video traffic by By 2018, 67 percent of all Internet video traffic will cross content delivery networks, up from 53 percent in 2013.
Fixed broadband speeds will nearly triple by 2018 (FTTH access, Wi-Fi Hotspots)
IP Video accelerates IP traffic growth (but upstream/downstream asymmetry seems to persist, due to Clouds and CDNs)
Other factors: expected IPv6 growth; pricing and user quota imposed by Service Providers; migration from offline to online (clouds); from multicast to unicast; Ultra HD demand (4K); growth of Internet-of-Everything (M2M)

13. Global Consumer Internet Video

14. 4K Video Traffic

15. Increasing Video Definition
By 2018, more than 20% of connected flat-panel TV sets will be 4K

16. References Video Formats Guide [pdf]: Wikipedia:
Wikipedia:
The Zettabyte Era: Trends & Analysis (Cisco White Paper)
Video on the Web:
Video size calculators:
Video resolution standards: