Introduction of RTMP(Real Time Messaging Protocol)

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What exactly is RTMP and its classifications?

RTMP (Real Time Messaging Protocol)

RTMP is a TCP based aptness protocol developed by Adobe System for the function of streaming Audio/Video data between Flash Player and media server.

RTMPT (Real Time Messaging Protocol with Tunnel)

RTMPT is a variation of RTMP which works behind the firewall as well. It works on Port 80 and encapsulate the RTMP data in HTTP request.

RTMPS (Real Time Messaging Protocol Secure)

RTMPS is again a variation of RTMP which works over secure HTTPS connection.

RTMPE (Real Time Messaging Protocol with Encryption)

RTMPE is a new 128 bit encrypted protocol developed by Adobe systems for securing the stream data between flash client and server. It’s lightweight than SSL. It’s a DRM solution from Adobe for flash.

RTMPTE (Real Time Messaging Protocol with Encryption and Tunnel)

RTMPTE is a RTMPE tunneling over HTTP on port 80.

MRTMP (Multiplex Real Time Messaging Protocol)

Multiplex RTMP is a protocol between edge and origin, developed by Red5 for clustering of stream data using Terracotta.

How does RTMP run?

The raw TCP-based RTMP maintains a single persistent connection and allows real-time communication. To guarantee smooth delivery of video and audio streams, while still maintaining the ability to transmit larger chunks of information, the protocol may split video and data into fragments. The size of the fragments used can be negotiated dynamically between the client and server, and even disabled completely if desired, although the default fragment sizes are 128 bytes for video and most other data types, and 64-bytes for audio data. Fragments from different streams may then be interleaved and multiplexed over a single connection. With longer data chunks, the protocol would then only carry a one-byte header per fragment, thus incurring very small overhead. In practice but, party fragments are not typically interleaved. Instead, the interleaving and multiplexing is done at the packet amount, with RTMP packets across several different active channels being interleaved in such a way to ensure that each channel meets its bandwidth, latency, and other quality of service requirements. Packets interleaved in this make are treated as indivisible, and are not interleaved on the fragment amount.

The RTMP defines several channels on which packets may be sent/received, and which run independently of each other. During a typical RTMP session, several channels may be active simultaneously at any given time. When RTMP data is packetized, a packet header is generated. The packet header specifies, among other things, the id of the channel that it is to be sent on, the timestamp at which is was generated (if necessary), and the size of the packet payload. This is then followed by the packet payload, which is fragmented according to the currently agreed-upon fragment size before it is ongoing over the connection. The packet header itself is never fragmented, and its size does not count towards the data in the packet’s first fragment. In other words, only the actual packet payload data is subject to disintegration.

What players support RTMP?

The most well-known RTMP client is Adobe’s Flash Player which can stream video and audio from RTMP servers. Besides, the open fund media player XBMC has bought preliminary support for playing RTMP streams in its SVN version. Recently, Moyea Web Player version 2.0 with the RTMP Stream Plugin supports the playback of live streaming videos, SMIL presentations, and streaming videos from RTMP servers. Besides, JW Player and Flow Player supports RTMP as well.

What is RTMP server software?

Currently, the only full implementation RTMP servers are the Adobe Flash Media Server, Onlinelib VCS Video Communication Server (including iPhone Support), Wowza Media Server and WebORB Integration Server (free and available for .NET, Java and ColdFusion) both commercial and closed fund implementations.

There is a reverse engineered open fund project called Red5 which aims to produce a feature-complete implementation written in Java. As of October 2007, the majority of the functionality is implemented, although the project is still in the beta stage. OneTeam Media Server has also been announced by ProcessOne.

Some related news?

On 20 January 2009 Adobe announced it will publish the RTMP specification. On 21 May 2009 Adobe filed a DMCA removal request on a Sourceforge-hosted implementation of the protocol. On Monday, June 15, 2009 Adobe released the RTMP Specification, which is calculated for high-performance transmission of audio, video, and data between Adobe Flash Platform technologies.

The project is dedicated to driving rich Internet experiences across televisions, personal computers, mobile devices, and consumer electronics. To support this mission, and as part of Adobe’s ongoing commitment to enable Web innovation, Adobe will continue to open access to Adobe Flash technology, accelerating the deployment of content and rich Internet applications (RIAs). This work will include:

Removing restrictions on use of the SWF and FLV/F4V specifications.
Publishing the contrivance porting layer APIs for Adobe Flash Player.
Publishing the Adobe Flash® Cast™ protocol and the AMF protocol for robust data services.
Removing licensing fees – making next major releases of Adobe Flash Player and Adobe AIR for devices free.

Sources are from Wikipedia.

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Part Ii: on Selecting Software (how to Do it Right the First Time)

How do you choose software that’s just aptly for your company’s use? What are the things that you should include in your checklist? Take a closer look at these guidelines:

Key Selection Criteria in Detail:

1) Company History & Experience

How Long Have They Been Around?

Company background is essential because unlike brick and huge gun companies, software companies are often small, and even beyond national boundaries. Since often these companies will be handling sensitive data related to your company, one needs to be doubly sure. Law hasn’t quite been able to pin down the particularities of the software industry, and in case of misdemeanor, it would be harder to hold such a company accountable.

One can safely assume that past records are a excellent indicator of future performance. Therefore it is a must that some time be place in researching the company before one even goes on to consider the software itself.

There are a few things that need to be checked. How long have they been around? Are they registered? How long have they been in the meadow? For example if they’re offering business communication software, have they been in this industry long enough to know it well? How long have they been in their contemporary business? Even if the software is new, do they have experience developing related softwares?

What is Their Niche?

Another very vital factor about the company’s history is the niche it has experience in serving. Does the company know your niche well enough to know your needs? If you are a small to mid sized business, it is unlikely a company serving the Fortune 500 will offer you the best solution. If you work from home, it is unlikely a solution serving large offices will meet your needs.

The Ultimate Testament – The Customer

The ultimate judge of a software are its users. To get a right picture of a software’s workings, it is vital to look at how customers are using it and what their comments are. It may entail looking at the site to see if they include a client’s list or page. If the list exists, is extensive and includes recognizable names, that is usually a excellent sign. Customer testimonials on the site are a excellent indicator of its performance, and one could also take the initiative of getting in touch with the customers oneself and seeking comments.

Dangers

There are certain things with the software industry that a buyer should be wary of. Because of the lower entry and exit costs, software startups are known to have shorter live spans than traditional companies. Lots of these companies are known to ride high on the success wave when the industry is doing well and go “pop” when the industry bubble bursts. This was well exemplified by the .com bubble burst of 2000, when many software companies disappeared without a trace.

It is debatable whether the contemporary spate of “web 2.0” companies also constitute another expanding buddle which will inevitably burst, but it makes sense that the buyer be wary and bet their cash with dependable companies with proven track records.

2) Cost

There’s no denying the importance of cost in buying decisions across the board. Yet the issue of cost should be seen in a broad perspective, because low entry costs may result in higher costs along the product’s life or higher overall costs for the company.

Features vs. Price

A cost benefit breakdown makes sense, as opposed to only considering costs. The costs need to be seen in light of the range of features and functionalities the product provides. An online document management system may not be the lowest priced in the market, but it may also allow you the capabilities of setting up a virtual office.

A declaration point is whether one wants to keep the financial statement down and buy a product with most of the main features, or willing to bombard out extra cash for the entire feature set. As costs go down, one will have to make some compromises on the features, but excellent research can reveal products which offer a very excellent cost to feature ratio.

Needs vs. Price

Another question which arises is whether there is an overlap between features and needs at all. Many of the features may not relate to needs which were sought to be addressed at all.

To retain objectivity one can clearly mark out ones needs, and accordingly classify features as “looked-for features” and “features not looked-for”. It is possible that all features may not fit nicely into this scheme as certain features may not be absolutely essential, but would be valuable still. Another possible scheme of classifying features could be “must have”, “nice to have”, and “future requirements” (relating to features that do not serve an immediate need but would in the future)

Armed with this objective information, one would be in a better position to assess various software solutions priced differently & offering different feature sets. A word of caution, purchasers often tend to go for products with loads of features, but never get around to using half of them. This represents wasted expenditure, so it is vital to analyze all features in light of needs.

3) Ease of Use/Adoption

A learning and adoption curve is involved with every new software buy as it needs to be integrated with contemporary systems or other softwares and the end users have to be brought up to alacrity using it. If the software is chunky and too complex, one can be sure of adoption resistance.

Ease of Use

The software should have an intuitive interface, and use of features should be pretty much self evident. The shorter the learning curve schooling a new user, the better. Solutions which are too complex or have crudely calculated interfaces are major turnoffs for users.

The software should have the ability to easily fit into the existing workflow and IT systems. It may often be necessary for the new software to communicate with established systems. Web-based softwares are a excellent example of softwares which nicely fit into diverse systems with minimum friction, because they need no elaborate implementation at the customers end and can be run from simply a web browser.

Adoption

To get a measure of “shelfware”, i.e., softwares which are bought but never used, one just needs to look at the statistics. Some studies peg the number of content management solutions which are shelved at 20-25%. At around a million dollars an implementation, this is really pretty pricey shelfware! According to another study, 22% of bought ERP licenses are not being used, in U.S.-based companies.

No doubt, “Shelfware” is a result of ill thought to buy decisions. These studies merely underline the importance of making an educated buy lest the cash is not washed-out on software that does small more than cooling its heels on an office shelf. One possible way to protect against shelfware is the new concept of “pay as you go” hosted solutions. The software is hosted with company itself, and buyers merely have to pay a monthly subscription rate, which can be opted out in case the customer realizes that the software is not compatible with his business.

Support

No matter how simple to use or intuitive a software is, there are bound to be times when one can’t find out how to work a particular feature or a glitch crops up. Hence quality of support services is very vital.

Some software solutions may require you to hire dedicated support staff of your own, while with others company support suffices. The cost of hiring support staff needs to be factored into the buying declaration

Provider support may be in the form of human help, i.e., customer care executives who promptly (or not) attend to your problems. Here also the amount of quality in terms of utility of solution provided, availability and conduct of support executives matters.

Support can also be in the form of an extensively documented help engine, or extensive help information on the company site, which provides solutions to very nearly all of the questions you could possibly have. This form of support is often more efficient than the human version.

Schooling

Schooling is another form of support which deserves special mention. Some companies offer free schooling seminars (online and offline) to help customers get up to alacrity with using a software. This greatly helps in getting started with a new software. In other cases the software force not warrant much specialized schooling at all. In some cases the company force offer paid schooling, which force be essential and whose cost needs to be factored into the buy declaration.

Maintenance

Maintenance costs and efforts have a major impact on the performance and adoptability of a software, and hence should form vital criteria of the buying declaration. In case the software is hosted at the company’s end, it is of utmost importance of the customer that the software be available online at all times, or the “uptime”. Uptimes are covered below the “service amount agreement” when you buy a software and range from 98% to 99.99%. A minimum uptime of 99% is what one must look for.

It is also vital how much preservation a software requires. Will specialized staff need to be hired to maintain and run the software? Or is it low maintenance or maintenance free?

The company’s preservation is also vital. Efforts to constantly improve upon the software underline a commitment to providing you quality service. Are bugs fixed promptly and on an ongoing basis? Are they just releasing a software and not updating it? One should develop a habit of keeping up with the company newsletter, new release clarification or the “what’s new” section on their site. Periodic newsletters and a “what’s new” section (which keeps getting updated) are indicative of a dynamic company constantly looking to improve.

4) Familiarity

The “feel” of the software is another vital criterion. Us software users are habituated creatures for whom changing a software is as hard as changing our favorite coffee or newspaper. The software should keep with the basic layout and navigation schemes we are used to. This makes for quicker transition.

One excellent way is to compare with the OS in which we would use the software. Does it have the same basic schema as the OS environment? A software with Mac schema on Windows wouldn’t sit that well. Another way could be to compare with other softwares which we are used to. If you are switching from an pricey software to a cheaper one, choosing a software with a akin “feel” would make sense. Does it retain most of the main features you are used to? Is it simple to get to those features?

5) Security

Security is a top consideration because in many cases the software company will be handling information critical to us – business, financial or personal data. We need to be triply assured that the sanctity of our data will be preserved and there are no risks of it being lost or falling into incorrect hands. This factor requires some research on the client data handling systems and practices of the software provider.

What safety features does the provider have?

Data encryption is the practice followed by warring sides during WW2 to protect the secrecy of their messages. It is now used by most companies stay on to protect the integrity of their clients’ information. Encryption is the process of coding information so that it is unreadable by anyone but those who have the key. There are different types of encryption, each of which is associated with a different amount of security. DAS is one amount, which was previously used extensively but is now known to have vulnerabilities. 128 bit encryption is offered by companies offering top notch security.

Password protection is another vital facet of security. What is the strength of the software to withstand manual and automated attempts to hack your password and access your information? The ability of the system to accurately detect a hacking attempt and lock up in time is vital.

Data Backup

In extreme cases of system breakdown caused by a facility fire, natural catastrophe or technical glitch etc, it is vital that your data is frequently and adequately backed up and not stored at a single facility. Excellent company data backup practices ensure that even if your local computer crashes, your data is safe and reachable through the software.

Certain factors are to be considered in backup practices. The first is the frequency of backups. If there is a long gap, there is a possibility of data being lost in intermittent periods. Secondly, what are the security arrangements at the facilities where your data resides? Is it manned and guarded by security personnel? What other systems are in place to protect the data? Is there a excellent firewall? What is the protection against virus attacks? What procedures are in place for catastrophe management?

All this requires research, and the extensiveness of the research depends on the sensitivity of the data we will be entrusting the software provider with. A personal mail program does not require the same kind of security as softwares handling banking or business information.

Track Record

As with company background, a small research on the security track record makes sense. Has the company ever been vulnerable to attacks before? What were the losses? How did the company react? How many years has the company had a excellent record. New companies will most likely have a clean record, but that isn’t automatically indicative of excellent security practices.

The Server System

The server system where the sensitive data in fact lies is very vital. This information will mostly be available in the terms of agreement. Is it state-of-the-art? Is it in step with the latest in the market?

The server infrastructure could be owned by the software provider themselves or outsourced to a dedicated national network providing hosting solutions. Outsourced hosting is a excellent thing because dedicated hosting companies have extensive expertise and infrastructure in protecting data, often handling critical data of Fortune 500 companies. This frees up the software provider to concentrate on the software itself.

The company force not have an elaborate setup at all, running the software and processing data through computers set up in the garage somewhere acting as servers. This should get your alarm bells ringing! The safety of your data could well depend on a baseball flying through the door.

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