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We will introduce the features and practical usage of NDI technology, which is revolutionizing the world of modern video production and distribution. We will approach the appeal of NDI, which is liberated from conventional cable wiring and expands the possibilities of video production with the power of networks.

2025/8/25 Edited to

... Read more「NDIとは?」を一言でいうと、同じネットワーク(LAN)上で、映像・音声・制御信号をIPでやり取りできる仕組みです。HDMIやSDIみたいに“映像はこのケーブル”と決め打ちするのではなく、スイッチングハブを中心にしたネットワークで機材同士がつながります。自分は最初、配信現場でケーブル本数が増えすぎて設営が大変だったのがきっかけでNDIを調べました。 NDIの強みは、配線の自由度と拡張性です。たとえばカメラ(またはPC画面)をNDIで出しておけば、別のPCのスイッチャーソフト(OBSやvMixなど)からネットワーク越しに入力できます。スタジオ内の配置替えをしても、LANさえ引けていれば「長いHDMIを買い直す」「SDIに変換する」みたいな手間が減りました。まさにAV over IPの未来、という言い方に納得しました。 一方で、導入時にハマりやすいポイントもあります。まずネットワーク帯域。NDIは画質設定によって通信量が大きく変わるので、1080pの複数系統を同時に流すならギガビット環境はほぼ必須です(余裕があると安心)。Wi‑Fiでも動くことはありますが、安定性が必要な収録・配信では有線LANが無難でした。次に、スイッチ(ハブ)の品質。安価な機器だと負荷時に不安定になることがあるので、配信が止まると困る現場では少し良いものを選ぶと気持ちが楽です。 活用例としては、(1) 複数PCの画面共有をNDIで集約して配信、(2) 会場カメラ映像をスイッチャーPCへ集めてライブ配信、(3) スタジオ内でスタッフ用モニターを増やす、などが定番です。自分が便利だと思ったのは、資料PC・講師PC・リモート参加者の画面をNDIで出して、スイッチャー側で必要なものだけ選ぶ運用。ケーブルの抜き差しが減って、トラブル対応が早くなりました。 これからNDIを試すなら、まずは「同一LAN内でPC→PCにNDI映像を飛ばす」小さな構成から始めるのがおすすめです。動くことが確認できたら、カメラやコンバーターを足していくと理解が早いです。NDIは“魔法”というより、ネットワーク設計がうまくいくほど強くなる技術なので、AV over IPを意識して環境を整えると失敗が減ります。

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