Skip to main content
D
David29398374ktnz
Participant
June 17, 2025

Mercury Transit: No Alpha in Transmitted Video

  • June 17, 2025
  • 2 replies
  • 119 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).

 

 

    2 replies

    JanDeLange
    JanDeLange
    Participant
    May 6, 2026

    I have the same problem. Reached out to the developers of NDI and they send me here. Would be great if this can be fixed! 

    A
    Arie Stavchansky
    Legend
    May 6, 2026

    As far as I’m aware current AE team is aware of this issue.  The Mercury Transmit feature was engineered and built for professional studio environments.  This feature was intended for creative directors to simply monitor a composition that an operator would update and adjust in real time — it was simply to pipe the buffer to a hardware monitor. Hopefully it will be updated so alpha info is transferred in that piping.  NDI and servers like Syphon-Transmit could latch onto and issue alpha channel data and do some pretty interesting things.

    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.

    Terms & ConditionsAccessibility statement
    Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices