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David29398374ktnz
Participant
June 17, 2025

Mercury Transit: No Alpha in Transmitted Video

  • June 17, 2025
  • 1 reply
  • 78 views

When enabling Mercury Transit in After Effects, the sent Video Preview does not contain any Alpha Channel information even if the entire composition is empty. The transmitted video sends the composition overlayed over the previewed composition's background color.

This is occuring on Windows, AE 25.3.0. I am checking Mercury Transit using the NDI for After Effects plugin, and monitoring both the NDI Studio Monitor and an NDI Source.

Not sure if this is more a bug or a feature-request (having this be toggle-able would be great).

 

 

    1 reply

    A
    Arie Stavchansky
    Legend
    March 3, 2026

    I’ve noted this, too. This should definitely be classified as a bug, yes.  Using the NDI Tools for Premiere Pro, the alpha channel is sent over Mercury Transmit, so in that context transparency is fully supported.  I don’t even think it needs to be toggle-able — just send the alpha data over the line to Mercury Transmit, then let the receiving app that ingests that signal deal with how to handle that data.  The feature in AE should def. be at parity with PremierePro.

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