Tuesday, July 25, 2017
Search
  
Submit your own News for
inclusion in our Site.
Click here...
Breaking News
Spotify Close to Deal With Warner - sources
Western Digital Announces Four-bits-per-cell Technology On 3D NAND
Samsung Galaxy J3 and J7 are now Unlocked
Second Version of HoloLens HPU Will Incorporate AI Coprocessor For implementing DNNs
LG Electronics Unveils Audio-focused Q8 Smartphone
Lyft Forms Autonomous Vehicle Unit
More Than Half German Companies Hit by Sabotage, Spying, BSI says
Intel, Microsoft and Amazon Side with Apple in Qualcomm's iPhone Ban Dispute
Active Discussions
Which of these DVD media are the best, most durable?
How to back up a PS2 DL game
Copy a protected DVD?
roxio issues with xp pro
Help make DVDInfoPro better with dvdinfomantis!!!
menu making
Optiarc AD-7260S review
cdrw trouble
 Home > News > Optical Storage > Five Ja...
Last 7 Days News : SU MO TU WE TH FR SA All News

Tuesday, April 10, 2001
Five Japanese Companie's Proposal Wins Industry Acceptance for MPEG-4 Transfer Protocol Standardization


Five Japanese companies today announced that their jointly proposed format for transferring MPEG-4 streams over the Internet has now been accepted by three key organizations that promote development of Internet protocols. Toshiba Corporation, NEC Corporation, Oki Electric Industry Co., Ltd., Matsushita Electric Industrial Co., Ltd. and Nippon Telegraph and Telephone Corporation confirmed that the 3G Partnership Project (3G-PP) has joined the Internet Engineering Task Force (IETF) and the International Telecommunications Union (ITU) in supporting the standard, a move expected to bring uniformity to MPEG-4 content on the Internet and delivered over mobile networks.

The new transfer format is based on the Real-time Transport Protocol (RTP) standardized by IETF in 1996, rather than TCP/IP, which IP networks typically use for their transfer protocol. However, if TCP/IP detects any loss of data during transmission, it automatically retransmits it. The practical result is delays in data transfers that are unacceptable for real-time transfers of audio and video signals, particularly in streaming video and audio.

RTP is functionality suited for carrying real-time content as it provides support for applications with real-time properties, including timing reconstruction and loss detection. RTP uses UDP/IP, which doesn't have resending process characteristics. It places RTP headers in each packet that contains a timestamp, enabling synchronized display of audio and video signals at receivers, and sequence numbers to support packet loss detection. These characteristics enable timely data delivery with less degradation. RTP is widely used for audio and video distribution over the Internet, Internet tele-conferencing systems and Voice over IP (VoIP).

RTP is designed to define payload formats for each audio-video medium transferred. This is the area where the solution proposed by the five Japanese companies has been accepted for MPEG-4 audio and video signals.

A characteristic of the RTP payload format for MPEG-4 video is the provision of MPEG-4 error resiliency tools, to reduce packet loss. In order to improve transmission error resiliency, the MPEG-4 coding exploits the video packet approach within MPEG-4's error resilience tools, which subdivides the picture frames while coding. MPEG-4 also employs a technique called Header Extension Code (HEC), a 1-bit field introduced in each video packet. If this bit is set, the important header information that describes the video frame is repeated in the video packet. By checking this header information in the video packets against the information received at the beginning of the video frame, the decoder can ascertain if the video frame header is received correctly. If the video frame is corrupted, the decoder can still decode the rest of the data in the video frame using the header information that is repeated in the video packets.

The RTP payload format for MPEG-4 audio is an adoption of Low-overhead Audio Transport Multiplexing (LATM) technology, which effectively transfers multiple audio frames with a very low overhead.

It also offers an advantage in the comparative simplicity of the RTP format, in that audio and video streams are directly mapped onto the RTP packet and do not require specific headers or multiplexing.

The five companies held interoperability tests on the transfer format and confirmed its stability and reliability. The format was adopted by the IETF as the RTP payload format for MPEG-4 audio and video signals, by the 3G Partnership Project (3G-PP) in its packet switched multimedia streaming service standard for 3G mobile phones, and by the ITU Telecommunications Standardization Sector (ITU-T) in its recommendation for multimedia conferencing over packet-based networks such as LANs and the Internet.

The standardization will greatly contribute to promoting audio-video distribution on the Internet and in bringing the distribution service to next-generation cellular phones. It is especially important for such applications as Internet telephony and cellular telephony, where a high level of interoperability is required


Previous
Next
Plextor and Liquid Audio Deliver a Digital Music Solution To CD-R/RW Users        All News        Plextor and Liquid Audio Deliver a Digital Music Solution To CD-R/RW Users
Plextor and Liquid Audio Deliver a Digital Music Solution To CD-R/RW Users     Optical Storage News      Plextor and Liquid Audio Deliver a Digital Music Solution To CD-R/RW Users

Source Link Get RSS feed Easy Print E-Mail this Message

Related News
Toshiba Resumed Blocking Western Digital Access to JV Database
HMD Launches New Nokia 105 and Nokia 130 Basic Phones
Court Says Western Digital Should Have Access Toshiba's Technical Databases
Toshiba in Talks with Western Digital, Foxconn Over Memory Unit Sale
Western Digital Responds to Toshiba's Actions
Toshiba Delays Chip Unit Deal, Sues Western Digital
Western Digital Resubmits Bid for Toshiba Chip Unit
Nokia 6 Smartphone Will be Available on Amazon
Toshiba Chip-Unit Final Agreement Said to be Delayed, WD Opposes Participation of SK Hynix
Toshiba Open to Further Talks With Western Digital About Chip Unit Sale
Japan-led Consortium Wins Toshiba Memory Bidding
Toshiba Applies Spintronics Technology to Strain-gauge Sensor Element to Boost Sensitivity

Most Popular News
 
Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2017 - All rights reserved -
Privacy policy - Contact Us .