Featured Research

from universities, journals, and other organizations

Disruption-free Videos

Date:
September 6, 2008
Source:
Fraunhofer-Gesellschaft
Summary:
Standardized video coding techniques still have their snags – digitally transmitted images are not always disruption-free. An extension of the H.264/AVC coding format allows to protect the most important data packets to ensure they arrive safely at the receiver.

Standardized video coding techniques still have their snags – digitally transmitted images are not always disruption-free. An extension of the H.264/AVC coding format allows to protect the most important data packets to ensure they arrive safely at the receiver.

Your favorite detective series has just reached its most exciting moment when it happens: The thunderstorm raging outside interferes with the digital image on your TV. The picture keeps getting stuck – and the murderer goes undetected. The reason for such interferences is that crystal-clear image quality, such as in HDTV, involves an increased volume of data.

But the data packets are at risk during transmission, as information can be lost along the way. This poses a serious problem for developers of video coding techniques. Once the data packets are lost, it is very difficult to correct the error.

Researchers at the Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut, HHI in Berlin are therefore working to improve standardized video coding techniques such as the H.264/AVC format, which is used by the YouTube video portal and Apple’s QuickTime player, for example. If an Internet node is overloaded, for instance, data packets are randomly discarded during transmission.

This causes a jerky picture. “Our extension of the H.264/AVC coding format protects the most important parts of the data packets so that they can be broadcast without error,” says Dr. Thomas Wiegand, head of department at the HHI and a professor at the Berlin Institute of Technology. The data packets in question are precisely those required for a disruption-free video.

The researchers use additional data to protect them. “If, say, two video packets need to be transmitted, we equip an additional data packet with the result of the sum of the bytes in the two video data packets. If any of these three data packets gets lost, we can deduce the content of the original two,” explains Wiegand. The new coding format makes it possible to restrict these additional data packets to the most important part of the video. In this way, if anything does get lost, only the quality will fluctuate.

The extension of the H.264/AVC format is called SVC (scalable video coding). It runs on all H.264/AVC-compatible devices, so customers do not need to buy new ones. Moreover, it works independently of the overall data volume and can ensure fault-free reception even for high-resolution TV. SVC standardization has now been completed and will come into use in various applications: for HDTV, the Internet, video conferences, surveillance technology or mobile radio.

The researchers will present the new extended format at the IBC conference in Amsterdam (Hall 8, Stand 381) on September 12 through 16.


Story Source:

The above story is based on materials provided by Fraunhofer-Gesellschaft. Note: Materials may be edited for content and length.


Cite This Page:

Fraunhofer-Gesellschaft. "Disruption-free Videos." ScienceDaily. ScienceDaily, 6 September 2008. <www.sciencedaily.com/releases/2008/09/080905072130.htm>.
Fraunhofer-Gesellschaft. (2008, September 6). Disruption-free Videos. ScienceDaily. Retrieved October 21, 2014 from www.sciencedaily.com/releases/2008/09/080905072130.htm
Fraunhofer-Gesellschaft. "Disruption-free Videos." ScienceDaily. www.sciencedaily.com/releases/2008/09/080905072130.htm (accessed October 21, 2014).

Share This



More Computers & Math News

Tuesday, October 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Japanese Scientists Unveil Floating 3D Projection

Japanese Scientists Unveil Floating 3D Projection

Reuters - Innovations Video Online (Oct. 20, 2014) Scientists in Tokyo have demonstrated what they say is the world's first 3D projection that floats in mid air. A laser that fires a pulse up to a thousand times a second superheats molecules in the air, creating a spark which can be guided to certain points in the air to shape what the human eye perceives as an image. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Apple Enters Mobile Payment Business

Apple Enters Mobile Payment Business

AP (Oct. 20, 2014) Apple is making a strategic bet with the launch of Apple Pay, the mobile pay service aimed at turning your iPhone into your wallet. (Oct. 20) Video provided by AP
Powered by NewsLook.com
Apple Pay Goes Live

Apple Pay Goes Live

Reuters - Business Video Online (Oct. 20, 2014) Apple launches an ambitious new mobile service, Apple Pay, which aims to change the way consumers pay for goods and services, doing away with cash and traditional credit cards. Jeanne Yurman reports. Video provided by Reuters
Powered by NewsLook.com
Google To Protect Against Piracy ... At A Cost

Google To Protect Against Piracy ... At A Cost

Newsy (Oct. 20, 2014) Google is changing its search-engine results to protect content producers from piracy — for a price. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins