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ST2110

What is ST2110? Established in 2017 SMPTE international standard for IP transmission for broadcasting

Transmission of video, audio and metadata in separate synchronous streams

To realize non - compression transmission of high quality and low delay.

However, at present, expensive dedicated equipment and network facilities are required and advanced network knowledge is required.

2025/8/26 Edited to

... Read moreST2110とは、放送・映像制作の現場で「SDIの代わりにIPネットワークで非圧縮の映像/音声を運びたい」ときに出てくる、SMPTE(米国映画テレビ技術者協会)が定めた国際標準(SMPTE ST 2110)です。私も最初は“AV over IPって結局何が変わるの?”という疑問から調べましたが、要点は「信号をまとめて運ぶ」のではなく「要素ごとに分けて運び、同期させる」ことだと理解するとスッと入ってきました。 従来のSDIはケーブル1本に映像・音声・付随データを一緒に載せて運べる反面、ルーティングや拡張は物理配線に引っ張られがちです。一方ST2110では、映像・音声・メタデータを別々のストリームとしてネットワーク上に流します。たとえば映像だけ差し替えたい、音声だけ別系統から合流したい、といった構成が取りやすく、柔軟なルーティングができるのが大きな魅力です。 「高品質・低遅延」と言われる理由は、基本的に非圧縮(または制作に適した軽い処理)で扱う設計だから。ライブ制作や中継のように遅延がシビアな用途では、圧縮をかけないメリットが効いてきます。さらに同期はPTP(精密時刻同期)の考え方が前提になるので、複数機器間で“同じタイミング”を合わせやすいのも放送向けらしいポイントだと感じました。 ただ、ST2110の導入が難しいと言われるのも事実です。ネットワーク帯域の設計(どれくらいのGbEが必要か、どこで輻輳が起きるか)、スイッチの機能要件、冗長化構成、マルチキャスト運用など、放送の知識に加えてネットワークの知識が一段深く求められます。現時点では専用機器や対応スイッチなど初期コストも高く、スモールスタートしにくい印象もあります。 私が「ST2110とは?」を学ぶときに役立った理解の仕方は、(1) 非圧縮で運ぶ前提=帯域を食う、(2) 映像・音声・メタデータを分離して運ぶ=構成は自由だが設計は複雑、(3) 同期が重要=PTPがカギ、の3点にまとめることでした。AV over IPの次世代技術として注目される一方で、メリットとデメリットを両方押さえて検討するのが現実的だと思います。

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