macbroadcast´s blog


WebRTC – Real-Time Communications via simple Javascript
September 6, 2011, 6:12 pm
Filed under: howto, linux, openCU, openCV, socialweb, society, streaming | Tags: , , , ,

 WebRTC is a free, open project that enables web browsers with Real-Time Communications (RTC) capabilities via simple Javascript APIs. The WebRTC components have been optimized to best serve this purpose.

Our mission: To enable rich, high quality, RTC applications to be developed in the browser via simple Javascript APIs and HTML5.

Our first milestone: To provide the key RTC components to the browser community and collaborate on implementing a universal set of Javascript APIs.

The WebRTC initiative is a project supported by Google, Mozilla and Opera.

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Expanding VP8 Hardware Decoder for Full WebP Support
June 23, 2011, 11:50 pm
Filed under: openCU, openCV, socialweb, streaming | Tags: , , , , ,

With the recent launch of WebP support in Chrome, Picasa and Gmail, we’re happy to announce that the third generation G-Series 1 VP8 hardware decoder, called “Chip Shot,” now offers full 256 Megapixel support for WebP still images. The G-Series 1 is available for licensing at no cost through the WebM Project hardware page.

Chip Shot is part of our new golf theme for VP8 hardware decoders, as we noticed that most of the engineers working on the G-Series decoder are very fond of the sport.

 

The G-Series 1 decoder offers both 1080p 30 frames per second WebM and 36.5 Megapixels per second WebP processing at around 100 MHz clock rate. It is a full hardware implementation, requiring a mere 2 MHz host CPU load even when processing 1080p video or any size WebP images. The decoder uses 380 kilogates of logic area and 52 kilobytes of embedded single-port memory. The logic consumes a negligible 27 mW of power at 1080p resolution, ensuring many hours of video playback time on battery-operated devices.

Based on the previous releases of the silicon-proven G-Series 1 decoder IP, Chip Shot is a low-risk solution for anyone who wants to enable WebM and WebP support on their chipsets or SOCs. Including all G-Series 1 versions that support WebM, we have released over 50 decoders to our semiconductor partners worldwide to date.



Bufferbloat: Dark Buffers in the Internet
June 7, 2011, 8:17 pm
Filed under: Big Brother, globalchange, openCU, socialweb, society, Softwarepatents, streaming


A history of video conferencing (VC) technology
April 21, 2011, 4:01 pm
Filed under: ipv6, linux, openCU, society, streaming, Urheberrecht | Tags: , , ,

Picurephone, 1964

  • 1956: AT&T builds the first Picturephone test system
  • 1964: AT&T introduces Picturephone at the World’s Fair, New York
  • 1970: AT&T offers Picturephone for $160 per month
  • 1971: Ericsson demonstrates the first trans-atlantic video telephone (LME) call
  • 1973 Dec: ARPAnet packet voice experiments [1]
  • 1976 Mar: Network Voice Protocol (NVP), by Danny Cohen, USC/ISI
  • 1981 Jul: Packet Video Protocol (PVP), by Randy Cole, USC/ISI [2]
  • 1982: CCITT (forerunner of the ITU-T) standard H.120 (2 Mbit/s) video coding, by European COST 211 project
  • 1982: Compression Labs begins selling $250,000 VC system, $1,000 per hour lines
  • 1986: PictureTel’s $80,000 VC system, $100 per hour lines
  • 1987: Mitsubishi sells $1,500 still-picture phone
  • 1989: Mitsubishi drops still-picture phone
  • 1990: TWBnet packet audio/video experiments, vt (audio) and pvp (video) from ISI/BBN[3]
  • 1990: CCITT standard H.261 (p x 64) video coding
  • 1990 Dec: CCITT standard H.320 for ISDN conferencing
  • 1991: PictureTel unveils $20,000 black-and-white VC system, $30 per hour lines
  • 1991: IBM and PictureTel demonstrate videophone on PC
  • 1991 Feb: DARTnet voice experiments, Voice Terminal (vt) program from USC/ISI [4]
  • 1991 Jun: DARTnet packet video test between ISI and BBN.
  • 1991 Aug: UCB/LBNL’s audio tool vat releases for DARTnet use
  • 1991 Sep: First audio/video conference (H.261 hardware codec) at DARTnet
  • 1991 Dec: dvc (receive-only) program, by Paul Milazzo from BBN, IETF meeting, Santa Fe [5]
  • 1992: AT&T’s $1,500 videophone for home market
  • 1992 Mar: World’s first MBone audio cast (vat), 23rd IETF, San Diego

The MBone map

 

 

  • 1992 Jul: MBone audio/video casts (vat/dvc), 24th IETF, Boston [6]
  • 1992 Jul: INRIA Videoconferencing System (ivs), by Thierry Turletti from INRIA
  • 1992 Sep: CU-SeeMe v0.19 for Macintosh (without audio), by Tim Dorcey from Cornell [7]

 

 

  • 1992 Nov: Network Video (nv) v1.0, by Ron Frederick from Xerox PARC, 25th IETF, Washington DC [8]
  • 1992 Dec: Real-time Transport Protocol (RTP) v1, by Henning Schulzrinne
  • 1993 Apr: CU-SeeMe v0.40 for Macintosh (with multipoint conferencing)
  • 1993 May: Network Video (nv) v3.2 (with color video)
  • 1993 Oct: vic initial alpha, by Steven McCanne and Van Jacobson from UCB/LBNL[9]
  • 1993 Nov: VocalChat v1.0, an audio conferencing software for Novell IPX networks [10]
  • 1994 Feb: CU-SeeMe v0.70b1 for Macintosh (with audio) , audio code by Charley Kline‘s Maven[11]
  • 1994 Apr: CU-SeeMe v0.33b1 for Windows (without audio), by Steve Edgar from Cornell
  • 1995 Feb: VocalTec Internet Phone v1.0 for Windows (without video)
  • 1995 Aug: CU-SeeMe v0.66b1 for Windows (with audio)
  • 1996 Jan: Real-time Transport Protocol (RTP) v2, by IETF avt-wg[12]
  • 1996 Mar: ITU-T standard H.263 (p x 8) video coding for low bit-rate communication
  • 1996 Mar: VocalTec Telephony Gateway
  • 1996 May: ITU-T standard H.324 for POTS conferencing
  • 1996 Jul: ITU-T standard T.120 for data conferencing
  • 1996 Aug: Microsoft NetMeeting v1.0 (without video)
  • 1996 Oct: ITU-T standard H.323v1, by ITU-T SG 16[13]
  • 1996 Nov: VocalTec Surf&Call, the first Web to phone plugin
  • 1996 Dec: Microsoft NetMeeting v2.0b2 (with video) [14]
  • 1996 Dec: VocalTec Internet Phone v4.0 for Windows (with video)
  • 1997 Jul: Virtual Room Videoconferencing System (VRVS), Caltech-CERN project
  • 1997 Sep: Resource ReSerVation Protocol (RSVP) v1, by IETF rsvp-wg
  • 1998 Jan: ITU-T standard H.323 v2
  • 1998 Jan: ITU-T standard H.263 v2 (H.263+) video coding
  • 1998 Apr: CU-SeeMe v1.0 for Windows and Macintosh (with color video), from Cornell
  • 1998 May: Cornell’s CU-SeeMe development team has completed their work and has gone on to other projects
  • 1998 Oct: ISO/IEC standard MPEG-4 v1, by ISO/IEC JTC1/SC29/WG11 (MPEG)
  • 1999 Feb: Session Initiation Protocol (SIP) makes proposed standard, by IETF mmusic-wg[15]
  • 1999 Apr: Microsoft NetMeeting v3.0b (with gatekeeper)

 

  • 1999 Aug: ITU-T H.26L Test Model Long-term (TML) project , by ITU-T SG16/Q.6 (VCEG)
  • 1999 Sep: ITU-T standard H.323 v3
  • 1999 Oct: NAT compatible version of iVisit, v2.3b5 for Windows and Mac
  • 1999 Oct: Media Gateway Control Protocol (MGCP) v1, IETF
  • 1999 Dec: Microsoft NetMeeting v3.01 service pack 1 (4.4.3388)
  • 1999 Dec: ISO/IEC standard MPEG-4 v2
  • 2000 May: Columbia SIP user agent sipc v1.30
  • 2000 Oct: Samsung releases the first MPEG-4 streaming 3G (CDMA2000-1x) video cell phone
  • 2000 Nov: ITU-T standard H.323 v4
  • 2000 Nov: MEGACO/H.248 Protocol v1, by IETF megaco-wg and ITU-T SG 16
  • 2000 Dec: Microsoft NetMeeting v3.01 service pack 2 (4.4.3396))
  • 2000 Dec: ISO/IEC Motion JPEG 2000 (JPEG 2000, Part 3) project, by ISO/IEC JTC1/SC29/WG1 (JPEG)
  • 2001 Jun: Windows XP Messenger supports the SIP
  • 2001 Sep: World’s first trans-atlantic tele gallbladder surgery (operation Lindbergh)
  • 2001 Oct: NTT DoCoMo sells $570 3G (WCDMA) mobile videophone
  • 2001 Oct: TV reporters use $7,950 portable satellite videophone to broadcast live from Afghanistan
  • 2001 Oct: Microsoft NetMeeting v3.01 (4.4.3400) on XP
  • 2001 Dec: JVT video coding (H.26L and MPEG-4 Part 10) project, by ITU-T SG16/Q.6 (VCEG) and ISO/IEC JTC1/SC29/WG 11 (MPEG)
  • 2002 Jun: World’s first 3G video cell phone roaming
  • 2002 Dec: JVT completes the technical work leading to ITU-T H.264
  • 2003 May: ITU-T recommendation H.264 advanced video coding
  • 2010 Chatroulette ?

Sources : Wall Street Journal (27 February 1996), The MBone FAQ, rem-conf listserv, The MBone listserv, CU-SeeMe listserv, RTP: Historical Notes, and few PostScripts (*.ps).

Notes and References

[1] Danny Cohen, “Specifications for the Network Voice Protocol (NVP)”, RFC 741, Internet Engineering Task Force, November 1977.
“The major objective of ARPA’s Network Secure Communications (NSC) project is to develop and demonstrate the feasibility of secure, high-quality, low-bandwidth, real-time, full-duplex (two-way) digital voice communications over packet-switched computer communications networks. The Network Voice Protocol (NVP), implemented first in December 1973, and has been in use since then for local and transnet real-time voice communication over the ARPANET.”

[2] Randy Cole, “PVP – A Packet Video Protocol”, Internal Document, USC/ISI, July 1981.
“The Packet Video Protocol (PVP) is a set of extensions to the Network Voice Protocol (NVP-II) and consists mostly of a data protocol for transmission of video data. No specific changes to the NVP-II protocol are necessary for the PVP.”

[3] Eve M. Schooler, “A Distributed Architecture for Multimedia Conference Control”, ISI research report ISI/RR-91-289, November 1991.
“Voice Terminal (VT) program and Packet Video Program (PVP) were originally implemented on a BBN Butterfly multiprocessor. VT and PVP digitize and packetize data, using the Netowrk Voice Protocol (NVP) for audio and the Packet Video Protocol (PVP) for video. They transmit this data across the network using the experimental Stream Protocol (SP) and the Terrestrial Wideband Network (TWBnet).”

[4] DARTnet : A trans-continental IP network of about a dozen research sites connected by T1 trunks.
November 1988, small group (MIT, BBN, UDel, ISI, SLI, PARC, LBL) led by Bob Braden of USC/ISI proposes testbed net to DARPA. This becomes DARPA Research Testbed Net (DARTnet).
DARTnet has since evolved to CAIRN, which presently connects 27 institutions in the US and Britain.

[5] Tim Dorcey, “CU-SeeMe Desktop VideoConferencing Software”, Connexions, Volume 9, No.3, March 1995.
“In fact, it was Paul Milazzo’s demonstration of such a tool in 1991 that inspired development of CU-SeeMe.”

[6] The video used for the July 1992 Internet Engineering Task Force (IETF) was the Desktop Video Conferencing (DVC) program from BBN, written by Paul Milazzo and Bob Clements.
They have made available a receive-only program, but they retain a proprietary interest in the version that is capable of sending.
This program has since become a product, called PictureWindow.

[7] “When development of CU-SeeMe began in July 1992, the only real-time videoconferencing software for the Internet required expensive hardware which severely limited the number of potential senders and receivers. Working with Richard Cogger in the summer of 1992, Tim Dorcey wrote the original version of CU-SeeMe.”
URL: http://cu-seeme.cornell.edu
As the Macintosh did not have IP multicast support, CU-SeeMe took a more traditional approach and developed a multipoint server (Reflector) that CU-SeeMe clients could connect to.

[8] For the November 1992 IETF and several events since then, they have used two other programs.
The first is the Network Video (nv) program from Ron Frederick at Xerox PARC.
Also available from INRIA is the IVS program written by Thierry Turletti.
Van Jacobson, “Old timers might remember that the first, binary-only, release of nv happened 24 hours before the November 1992 IETF where it was first used.”

[9] vic (vi/deo c/onfernece) was inspired by nv. Portions of vic (the ordered dither, the nv-format codec, and some of the video capture code) were derived from the nv source code.
An early version of vic was used by the Xunet research community to carry out distributed meetings in Fall 1993.
vic change history at http://www-nrg.ee.lbl.gov/vic/CHANGES.html

[10] In 1991, 5 high school friends established ClassX, a start-up software company, at Raanana, Israel.
2 years later, 4 members of them joined VocalTec and they have developed the VocalChat v1.0-2.5, and the Internet Phone.
Ofer Shem Tov, “VocalChat early version was introduced first time in PCEXPO end of June 1993 in New York. It did half duplex calls over Novell IPX networks. VocalChat v1.0 was released in Comdex Fall, November 1993, in Las Vegas, it was a finished version of the PCEXPO product. First long distance call was done on Bell South Novell network from Atlanta to Miami. VocalChat 2.02 LAN and WAN were released in June 1994 and included voice mail, address book, TCP/IP support and support of VocalTec Compression Card (VCC) for low bandwidth links.
VocalChat GTI (Gateway To the Internet) was released in October 1994. It was focused on the Internet and required the VCC card.”

[11] Charley Kline, “I got annoyed at the Fall 1992 IETF when told that the only serious platform for multimedia conferencing was a hefty Unix workstation. I figured a Macintosh has better audio processing ability than a Sun (true!), so set about to write an audio conferencing tool for the Macintosh that would interoperate with the popular vat program for Unix.”
URL: http://spiffy.ci.uiuc.edu/~kline/cvk-ido.html

[12] Henning Schulzrinne, “Real-time Transport Protocol (RTP) is the Internet-standard protocol for the transport of real-time data, including audio and video. It can be used for media-on-demand as well as interactive services such as Internet telephony. RTP consists of a data and a control part. The latter is called RTP Control Protocol (RTCP).”
RTP has its roots in the early work done using Network Voice Protocol 2 (NVP-II) with vat, vt and nevot in 1991, which in turn has its roots in the Network Voice Protocol (NVP) experiences in the early 1970s.

[13] H.323 : “Visual telephone systems and equipment for Local Area Networks which provide a non-guaranteed Quality of Service.” (original title)
“Packet-based multimedia communications systems.” (revised title in H.323 v2 drafts)
4 main H.323 network components; Terminals, Gateways, Gatekeepers, and Multipoint Control Units (MCUs).
H.320 (N-ISDN), H.321 (B-ISDN, ATM), H.322 (GQoS LAN), H.323 (H.320 over LAN), H.324 (SCN), H.324 M (Mobile).

[14] Toby Nixon, “Microsoft NetMeeting version 2.0 and below uses an alternative call setup procedure that is permitted for combined H.323/T.120 terminals. Because NetMeeting was originally a T.120-based product (without H.323 support), it sets up the T.120 (data conference) call first, and then the H.323 (audio and video conference) call.”
Current versions of NetMeeting are not compliant with the H.323 standard as they do not attempt to register with a gatekeeper, a required function.

[15] SIP is a simple signaling protocol for Internet conferencing and telephony.
H.323 is an ITU-T standard, while SIP is the IETF approach.

The pioneering video conferencing tools :

  • CU-SeeMe
    from Cornell University
    platform : Apple Macintosh
  • DVC
    from BBN
    platform : Sun SPARC
  • IVS
    from INRIA
    platform : Sun SPARC, HP, SGI and DEC stations
  • NV
    from Xerox PARC
    platform : Sun SPARC, SGI and DEC stations

Video Conferencing Info page



Emgu CV is a cross platform .Net wrapper to the Intel OpenCV image processing library.
December 30, 2010, 11:14 am
Filed under: openCU, openCV | Tags: , ,

Emgu CV is a cross platform .Net wrapper to the Intel OpenCV image processing library. Allowing OpenCV functions to be called from .NET compatible languages such as C#, VB, VC++, IronPython etc. The wrapper can be compiled in Mono and run on Linux / Mac OS X.

EmguCVArchitecture.png

http://www.emgu.com/wiki/index.php/Main_Page



OpenCV – by Shervin Emami
December 5, 2010, 3:32 pm
Filed under: openCU, openCV | Tags:

found a nice blog with OpenCV examples….

OpenCV is a great library for creating Computer Vision software using state-of-the-art techniques, and is freely available for Windows, Linux, Mac and even the iPhone. OpenCV was originally designed by Intel in 1999 to show how fast Intel CPUs can run. So most of OpenCV runs very fast on Intel CPUs, now including some SSE2 optimizations.

However, OpenCV is mainly used for tasks that are complex in nature, often requiring post-grad experience in the fields of Computer Vision or Artificial Intelligence (AI). So this website tries to make it easier with tutorials and source-code. All source code on this site are free to use for educational or commercial purposes, but may not be used for military-funded projects.

If you have never used OpenCV before, you should first read my Introduction To OpenCV.
Warning: OpenCV is for creating futuristic applications that maybe no-one else has done before, so its important that you are good at computer programming BEFORE you start using OpenCV!



NVIDIA Adds GPU Acceleration for OpenCV Application Development
September 23, 2010, 6:19 pm
Filed under: openCU, streaming | Tags: , , , , ,

CUDA Support for OpenCV Paves the Way for New Mainstream Computer Vision-Based Applications, From Next-Generation Robotics to Safer Automobiles

SANTA CLARA, CA, Sep 23, 2010 (MARKETWIRE via COMTEX) — NVIDIA today announced CUDA support for OpenCV, the popular Computer Vision library used in developing advanced applications for the robotics, automotive, medical, consumer, security, manufacturing, and research fields.

With the addition of GPU acceleration to OpenCV, developers can run more accurate and sophisticated OpenCV algorithms in real-time on higher-resolution images while consuming less power. This will facilitate the development of scores of new, mainstream Computer Vision applications.

With thousands of developers and well over two million downloads to date, OpenCV is a popular Computer Vision library for the development of computational-intensive and powerful applications, many of which require robust real-time performance. For example, the new OpenCV depth calculation engine performs 5-10 times faster with GPU acceleration than with the equivalent CPU-only implementation.

more via marketwatch