Tag Archives: standard

SMPTE, DPP To Tackle IMF For Broadcast, Online

The Society of Motion Picture and Television Engineers today announced it will work with the Digital Production Partnership on a joint pilot specification project to create an IMF specification for broadcast and online.

The aim of the project is to provide a technical specification for IMF in broadcast and online applications as a breakdown of various elements, including video and audio packages composition playlists and output profile lists, SMPTE said in a press release.

Final publication of the IMF specification is expected before the 2018 NAB show in April, SMPTE said.

More information is available on the SMPTE website.

One More ST-2110 Tidbit

Earlier this week in the Playout blog, I reported on the Society of Motion Picture and Television Engineer’s answer regarding publication of its draft ST-2110 standard, the professional video-over-IP standard that is coming down the runway.

Since then, I’ve received a little more information from SMPTE director of engineering and standards Howard Lukk that anyone interested in ST-2110 may find helpful.

Once the draft standard has gone through its yearlong review stage during which interop tests will be done and any needed tweaks to the standard are uncovered and addressed, it will go through another ballot. At that point, presuming ST-2110 gets a thumbs up in the vote, the standard will be published in the IEEE Xplore library, says Lukk.

Interested members of the public at that point can access the standard from the library. Doing so will not be free; however, at this point the exact price is unclear, he adds.

AES67: Are Two Ships Passing In The Night?

“Ships that pass in the night, and speak each other in passing,
Only a signal shown and a distant voice in the darkness…”
— Henry Wadsworth Longfellow, Tales of a Wayside Inn

A funny thing happened on the way to IP audio interoperability. The Audio Engineering Society committee that developed the AES67 standard for IP audio couldn’t agree on a discovery mechanism, so it included four optional methods, says Aidan Williams, CTO of Audinate, developer of the Dante networking tech used by more than 200 OEMs in products for the professional audio and broadcast markets.

Just to review, AES67 is supposed to provide a way for audio equipment with an IP connection from one manufacturer to hook up to a piece of IP-enabled audio gear from another and communicate.

At a very basic level, before that sort of IP communications can happen, each device needs to know what it’s connected to — a process known as system discovery.

In a pure sense, AES67 provides for interoperability because all a user or vendor has to know is which system discovery options manufacturers have chosen, write some custom code to translate between the different discovery options in use and voila, the devices can communicate.

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