Category Archives: Internet

How to sync server time with Network Time Protocol server

Sync server time on Linux with NTP

What is NTP?

An Internet protocol is used to synchronise clocks of computers, for instance linux server. This protocol is known as NTP (Network Time Protocol).

Following steps shows how to sync time using the terminal. Before we start login to the server via terminal and follow the steps given below.

Step 1: Check whether NTP is installed

Use the ntpstat command to view the status of the NTP service on the instance. It may happen that you get an error message prompting that NTP is not installed. In that case you have to install it on the server.

# sudo ntpstat
-bash: ntpstat: command not found

Step 2: Install NTP

Use the following command to install NTP on server.

# sudo yum install ntp

Step 3: Start NTP

After the installation is complete we need to start NTP by using the following command.

# sudo systemctl start ntpd

Note!

Enable NTP to start at boot:

# sudo systemctl enable ntpd

Stop NTP:

# sudo systemctl stop ntpd

Restart NTP:

# sudo systemctl restart ntpd

Step 4: Sync Time

For this use the following command.

# sudo ntpdate -q 0.rhel.pool.ntp.org

And restart NTP

# sudo systemctl restart ntpd

…and the server time will be synced.

Sync server time on Windows with SNTP

What is SNTP?

Simple Network Time Protocol (SNTP) is a simplified version of Network Time Protocol (NTP).  This is used to synchronize computer clocks on a network. As name defines simplified version of NTP is generally used when full implementation of NTP is not needed.

SNTP is a simplified access strategy for servers and clients using NTP. This simplified protocol is widely used to synchronizes a computer’s system time with a server that has already been synchronized by a source such as a radio, satellite receiver or modem. 

Interestingly, SNTP supports unicast, multicast and anycast operating modes. In unicast mode, the client sends a request to a dedicated server by referencing its unicast address. Once a reply is received from the server, the client determines the time, roundtrip delay and local clock offset in reference to the server. In multicast mode, the server sends an unsolicited message to a dedicated IPv4 or IPv6 local broadcast address. Generally, a multicast client does not send any requests to the service because of the service disruption caused by unknown and untrusted multicast servers. The disruption can be avoided through an access control mechanism that allows a client to select a designated server he or she knows and trusts.

Use below code to sync server time on windows machine

@echo on & @setlocal enableextensions

@echo =========================
@echo Turn off the time service
net stop w32time

@echo =========================
@echo Set the SNTP (Simple Network Time Protocol) source for the time server

w32tm /config /syncfromflags:manual /manualpeerlist:"0.it.pool.ntp.org 1.it.pool.ntp.org 2.it.pool.ntp.org 3.it.pool.ntp.org"

@echo =========================
@echo ... and then turn on the time service back on

net start w32time

@echo =========================
@echo Tell the time sync service to use the changes

w32tm /config /update

@echo =========================
@echo Reset the local computer's time against the time server

w32tm /resync /rediscover

@endlocal & @goto :EOF
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Media Domain – common glossary

Media Glossary & Terminology

Ever wonder with all the terms being used in the Media industry? Here is a sneak peak of all the glossary.

Media resolution chart

Item  Description
Analog Media software which has a physical quality and presence.
Asset Uniquely identifiabse container for a file with descriptive metadata and, depending the asset class, a processing workflow
Asset class Specification of an asset to identify certain characteristics based on their asset kind
Asset description A descriptive attribute for a file
Asset kind Asset characteristics with mimetype. etc
Asset Management System (AMS) Manages database library of VOD Assets and associated metadata
Barker A promotional loop video played within a window in the On Demand GUI
Broadcasting  Refers to content carried over air waves. Usually designed to appeal to a broad audience segment.
Closed Captioning (CC) Embedded technology to provide scripted support of the program
Cloud Computing Internet-based computing accessible through a web browser and that uses data farms to store and make available software and information in real time.
Commercial For profit. Also, paid announcements produced for targeted audiences to sell products or ideas. The economic force that finances commercial media.
Connote/Connotation A description of value, meaning or ideology associated with a media text that is added to the text by the audience.
Content preparation Conform, check and format content and localisation
Contributor Any content provider (studio, distributor, content owner) who contributes to AMS
Copyright The laws that require compensation for the use of property and information owned by artists, writers and media producers.
Creative Commons A non-profit organization that seeks to expand how creative work is available for others to use legally.
Delivery DD (Due Date) Planned schedule for delivery of the ingested, fully prepared package which results in lob prioritization for asset processing (QC, transcoding, etc ) and actionable items (if assets haven’t been contributed to AMS yet)
Delivery Request An order of products for a platform, which results in preparatory work to meet the specifications of that platform resulting in a search for reusable metadata (from the title version) and files or the request for contribution to start the ingest process to complete the delivery request.
Delivery Request Locked Certain parts of a delivery may be locked when it is in progress. Updates are possible to a certain extent (restrictions based on certain criteria). These criteria may be subject to change.
Delivery SD (Start Date) Start of window in which deliveries can be submitted to a platform. Particularly useful with certain outlets who have a max per day.
Digital The storage and transmission of information by reducing it to digits and then reassembling it for an exact reproduction.
Digital Rights Management (DRM) A system that seeks to protect the copyright of data circulated via the Internet.
Director The person responsible for the overall look of a video or film product. Directs the action behind and in front of the camera. Sometimes directs the editing process.
Editing The process of arranging, assembling or excluding images, text and sound to produce a completed media product.
Editor The person responsible for assembling the various parts of a media product.
Fair Use The legal guidelines which exempt educators from certain copyright restrictions. Fair use of educational materials allows some media products to be used to a limited degree in the classroom.
Filter Easy to use GUI to easily segment data into smaller subsets
First Release Date Original release date. used for Year
Gatekeepers Those in control of the flow of information. The gatekeeper can choose to accept or reject a piece of information for public consumption. Newspaper publishers, editors and reporters, television producers, press secretaries, government spokespersons, radio station owners and broadcasting executives have all been cited as examples of media gatekeepers.
Genre Specific kinds of media content, e.g., drama, entertainment, information, news, advertising, etc. Each category is defined with traditional conventions, but categories may overlap as in “docu-drama” or “info-tainment.”
Genre A category of media texts characterized by a particular style, form or content.
GUI Graphic User Interface, the application of UpperEast as a user sees and uses it.
Ingest Manual or automated intake of content and metadata
Ingestion The process of receiving assets from a contributor, successfully entering those assets into the AMS, and preparing them according to the specification of the delivery platform to make them available as a delivery package.
ISAN International Standard Audiovisual Number – Unique ISO Identifier for Audiovisual Content for audiovisual works and versions thereof.
License ED (End Date) End of the window in which the product can be leased or rented
License SD (Start Date) Start of the window in which the product can be leased or rented
Logo The copyrighted symbol used to represent a corporation, company or individual.
Mash-Up A song, video or website that is the result of combining multiple songs, videos or websites.
Mass Media Mass media are channels of communication through which messages flow, produced by a few for consumption by many people. As the messages go through the channels, they may become distorted. When people receive mass-media messages, they have no opportunity for immediate feedback with the producers of the messages.
Media Vehicles that carry messages. Common media channels are televisions, radios, telephones and newspapers.
Media Targets Audiences are media targets. Audiences are targeted, sold and delivered to advertisers by media agencies. Groups are targeted on the basis of demographics, media-use patterns, ZIP codes, and polling by those who wish to sell or persuade.
Metadata The information used in describing assets. Metadata is descriptive data associated with a content asset package or file. It may vary in depth from merely identifying the content package title or information to populate an EPG to providing a complete index of different scenes in a movie or providing business rules detailing how the content package may be displayed, copied. or sold.
Metadata language Localisation of the metadata, e.g. in which language a synopsis is written
Metadata preparation Conform, check and format metadata according to the specification of the delivery platform.
Mezzanine Working copy of video asset of sufficient quality to generate the highest output, small enough to move around, archive, and work with, in order to free up resources once all major edits and processing are completed.
MIME Type http://www.freeformatter.com/mime-types-list.html#mime-types-list 
MOD – Movies On Demand Impulse viewing of a selection of movie programming with full pause, fast forward and reqind functionality for a per transaction charge. Also in use : TVOD
Movie version (Release version) A particular version, or aggregation of elements that affects the content of an audiovisual work. For example, any editorial change that affects the content of an audiovisual work (e.g. artistic content. editing, technical format, distribution) and which requires separate identification for the use or exploitation of that specific content can be treated as a new Version. Example Director’s Cut.
Narrowcasting Producing and designing media content in order to target a highly specific segment of the audience. Narrowcasting is often practiced by magazines, radio stations and cablecasters. Opposite of broadcasting.
Objective The ideal that the media producer or reporter is representing a balanced viewpoint on issues. The ideal that media producers are fair, accurate, unbiased conduits for information. Opposite of subjective.
Onboarding (operational) Entering new publication (delivery) platforms or (ingest) contributors to AMS
Order ID Unique order identification for tracking purposes
Podcasting A method for delivering audio or video files to users who subscribe to them.
Preview Something that a content provider produces to promote a particular piece of content Previews are usually 30 seconds to 1 minute long, and are most often excerpted from Trailer material (see definition) provided by the studios for that asset.
Prime Time That part of a radio or television schedule expected to attract the largest audience.
Producer The final authority in the electronic media production process. Sometimes the producer is the person who raises the money to produce media products.
Product Placement A process that advertisers use to have their brand or product appear in TV shows, movies and video games as part of the production.
Provisioning (asset) Platform, regional and localisation preparation to expect assets to enter into a workflow
Ratings (Movie/TV) Ratings of content for age limits and warnings for content, to advise parents regarding suitability of programming for children.
Reasons (Movie/TV Ratings) A specific reason for the indicated advisory, e.g. nudity, language, violence
Region A geographical, platform defined region that has specific language destination profiles e g Benelux (nl. fr, de) or The Netherlands (nl-NL)
Rendition Transcoding to a compressed format, multiple renditions exist for multiple bitrates.
Rights owner Studio that owns the (original) copyrights
Schedule delivery Scheduler for publication of a delivery to the respective platform once full compliance has been met (validation of content and metadata according to the specification of the platform)
Send Delivery (publish) Publication for a delivery to the respective platform once full compliance has been met (validation of content and metadata according to the specification of the platform)
Short synopsis A brief version of the movie title (for display) of max 256 chars.
Show type Series, Sports, Music, Ad, Miniseries, Movie, Other
Sound Effects Special effects using sound to suggest a story element such as background, time, place, character, etc. Also used to heighten and intensify action or evoke an emotional response.
Special Effects Sound or video used in the editing process to heighten drama or suggest a time, place or story element. Often used as a transition.
SVOD – Subscription Video On Demand Impulse viewing of a selection of programming with full pause, fast forward and rewind functionality for a flat monthly charge. Also in use “Premium On Demand”
Synopsis Full summary of title of max 4096 chars.
Technical metadata (metadata) Descriptive data about technical specification of a file, for example a framerate, duration, crop marks, etc.
Trailer Trailers promote a particular piece of content and range from about one to three minutes in length. They are typically produced by the studios. Depending requirements, they may or may not be encrypted.
Type Type of title version, e.g. movie or episode
UPC Universal Product Code (UPC) is a 12-digit bar code. Used extensively for retail packaging in United States.
User Generated Content (UGC) Online content, including text, graphics, video and audio, found on websites and blogs that individual users create rather than traditional producers, such as commercial broadcasters and production companies.
Version (movie) See “Movie version”
Vertical Integration The process by which a media company acquires another elsewhere in the production process.
Video On Demand On Demand is an entertainment service that allows viewers instant access to content such as movies, cable series, original programs, educational programming, premium channels, news, sports and more. Programming from the content provider is delivered by the consumer’s cable operator. The On Demand content can be free, subscription based, or paid for on a transactional basis. Consumers control what they watch and when, with features such as play, pause, fast-forward, rewind, stop and resume. Also more generally: On Demand
Year Year of release

Abbreviation used in Media industry

ABBR SHORT FOR
ACL Access Control Level
ADI Asset Distribution Interface
AVOD Advertising Video on Demand
CA Conditional Access
CC Closed Captioning
DD Due Date
EME Encrypted Media Extensions
GOP Group of Pictures
GUI Graphic User Interface
HDS Adobe HTTP Dynamic Streaming
HLS Apple HTTP Live Streaming
ISAN International Standard Audiovisual Number
MIME Multipurpose Internet Mail Extensions (aka Internet Media Type)
MOD Movies on Demand
MPEG Motion Picture Expert Group
MPEG-DASH Dynamic Adaptive Streaming over HTTP
MSS Microsoft Smooth Streaming
NTSC National Television System Committee
OID Order ID
PID Program Identification
STB Set-Top Box
SVOD Subscription Video on Demand
TVOD Transaction Video on Demand
UE UpperEast
UPC Universal Product Code
VOD Video on Demand
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