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Do You Link to Your Sources?
Mon, 19 May 2008 21:17:23 +0000
Too often I come across an interesting piece of information on a blog that does not contain links to the author’s sources. That’s too bad. All I can do at that point is shrug my shoulders and wonder if the story is true. Then I’ll probably close that browser tab and go somewhere else, because ...]
September Updates
Wed, 03 Sep 2008 18:02:12 +0000
Last week we rolled out several of the updates we have been quietly working on the past month and got a great response from the community. It was so great that we wanted to quickly go through and explain what’s new in BlogCatalog.
Updated Blog Listings
We’ve cleaned up the blog detail pages to put more focus ...]
need help with a custom web browser
Tue, 06 Jan 2009 12:48:45 GMT
Hello, I'm trying to make a custom web browser. I'm using the webBrowser control that does a huge part of the job for me. I wanted to add a search option to it (when you click search the browser sends you to lets say google and shows you the results). What I can't figure out is how to send the...
Unconnected Sockets Not Implemented
Mon, 05 Jan 2009 20:21:17 +0000
Before the holidays began, I was tasked with implementing ‘Secure Desktop Manager’ on all of the client’s firewalls to prepare for an upcoming security audit. The prelogin policies worked great for various versions of Linux and ran fine on MAC OSX, but intermittently worked for Windows XP and Vista. I don’t normally like using ASDM ...]
- Clean and intuitive AJAX based interface
- Integration with Microsoft Active Directory® (LDAP), vBulletin™ and ModernBill™ among many other third-party applications
- Reliable live chat seamlessly through a client's web browser
- ViewShare to share a desktop view with a client via their web browser
- Integrated VoIP (SIP) functionality
- Robust SLA management, work schedules and escalation pathways
- Teamworking features for creating and sharing events, tasks and contacts
- Detailed reports and analysis
- Synchronization with Microsoft® Outlook®
- Integrate and synchronize with a Windows Mobile® device
Pro MPEG Forum CoP3 or SMPTE 2022
Pro-MPEG Forum Code of Practice #3 release 2 (CoP3) or SMPTE 2022-2007, describe how MPEG-2 Transport Streams (MPEG-2 TS) should be encapsulated when sent over IP networks. It also describes a forward error correction (FEC) mechanism that can be used to correct errors than can occur during the transport. This article will explain how video content can be sent over IP networks and how errors can be corrected using CoP3 FEC.
ASI to IP
All MPEG-2 transport streams shall be encapsulated in RTP (Real-time Transport Protocol) according to RFC 1889 in conjunction with RFC 2250. Transport service is provided jointly by UDP (checksum and multiplexing) and RTP (sequencing and time stamping / jitter removing). RTP always uses an even UDP port number.
- The overall size of RTP payload must not exceed the MTU (Maximum Transfer Unit) in order to prevent RTP packets fragmentation around the network
- Short packets induce high overhead
The time stamp field in the RTP header is based on the PCR values from MPEG-2 with a resolution of 90 Khz.
Streams must include:
- Program Association Table (PAT)
- Program Map Table (PMT)
RTCP (Real-time Transport Control Protocol) can be included to periodically inform the sending side about network quality (e.g. lost packets, delay, jitter, etc.).
At the output of the IP network, the delivered Transport Stream must be fully ISO/IEC 13818-1 compliant (40ms maximum jitter, 1 artifact every hour, etc.).
What about error protection ?
Code of Practice #3 describes a Forward Error Correction (FEC) method for protection against errors in delivering professional MPEG-2 TS data over IP networks. With that method implemented in IP video gateays, packet errors, out of order packets, network jitter and delay can be compensated.
FEC data insertion is done in real-time along with TS over IP encapsulation: Protection data is calculated and embedded in regular RTP packets with a specific payload type.
It relies on simple XOR arithmetics:
if F=A B C, then if only A,B,F are present, C can be recovered.
A FEC matrix is generated and transmitted on two separate UDP ports:
FEC columns on UDP port + 2
FEC rows on UDP port + 4
FEC Matrix is computed as follows:
FEC packets can be computed for both columns and lines. One FEC packet is able to recover one lost RTP packet in a column/row. If several packets are lost in the same column for instance, FEC packet for rows can be used to re-generate the packet.
There is new version (ver5) of the R&S workbook vol 1. IE completely changed their style in this version of the workbook. The only bad thing I am seeing is they could be more detailed in their explanations but it's only a BETA.
http://www.lively.com/html/landing.html
In less than 7 years, Mercedes-Benz plans to ditch petroleum-powered vehicles from its lineup. Focusing on electric, fuel cell, and biofuels, the company is revving up research in alternative fuel sources and efficiency.
The German car company has a few new power-trains in the line-up that European journalists have had the opportunity to test out in the Mercedes facility in Spain. One vehicle includes the F700, powered by a DiesOtto engine that combines HCCI and spark ignition to get nearly the same efficiency as diesel, but minus the expensive after-treatment systems.
The engine can run on biofuels, and we may have a purchasable vehicle by 2010 -- a year that seems to be popular for the debut of a lot of new alternative fuel car models, making ’08 and ’09 simply thumb-twiddling years for consumers. I don’t know, maybe car makers just like the roundness of “2010.” The company’s next big step will be to launch a Smart electric car which is fuel and emission-free.
Anyway, Mercedes is looking into electric vehicles, both battery-powered and fuel-cell powered. Not only are models in development, but we’ve also seen the company making steps towards its zero-petroleum goal right now, from better cabs in London to li-ion battery improvements. The company also has about 100 Smart electric cars undergoing testing in London, with that favorite 2010 year as the projected market release date.
Mercedes is making serious investments, already putting nearly $4 million into the pot of its long-term Sustainable Mobility plan, with another nearly $1.4 billion going in before 2014.
While car models may be able to run on fuels other than gasoline or diesel, we have yet to find a method of both running and producing vehicles entirely free of fossil fuels. I’m waiting for a mainstream car line that creates renewable fuel, clean-running vehicles out of 100% recycled materials in plants run on 100% renewable, clean power … Will I even be alive when that finally happens? I have hope.
Via AutoblogGreen, The Sun; Photo Leonid Mamchenkov
source: http://green.yahoo.com/blog/ecogeek/603/mercedes-to-cut-petroleum-out-of-lineup-by-2015.html
Vegetarians can be referred to as true fanatics. On the other hand, they are seriously misled in their beliefs. Practically nobody argues with them, since it is really difficult to convince a vegetarian of his or her self-deception. May be that is the reason why the vegetarian movement develops so actively around the globe and continues to recruit many new members.
Gatekeeper trunk redundancy
Wed, 02 Aug 2006 18:56:42 +0000
If you have two gatekeeper trunks, one in a G711 region and the other in a G729 region and you setup the Route list with G711 as the first priority and G729 as the second priority and the gatekeeper does not have enough bandwidth to process a G711 call, then it will fallback and use ...]
Norton AntiVirus 2009 with Antispyware
Tue, 06 Jan 2009 11:45:39 GMT
Testing various versions of Symantec’s Norton AntiVirus (NAV) software over the last little years, the WinLabs team has always described the experience as bittersweet. While the software has always proved highly competent and user-friendly, it has also always been riddled with a long and...
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