Spout to MM > Jittery Output / Spout to Spout Receiver > Smooth Output
  • Adam_NOVAK
    junior Member
    Posts: 1
    Joined: Tue Sep 10, 2019 6:46 pm

    Spout to MM > Jittery Output / Spout to Spout Receiver > Smooth Output

    by Adam_NOVAK » Wed Sep 11, 2019 12:46 pm

    Hi all,

    We are running an app built in Unity that is outputting via Spout to MadMapper and then outputting to a 4K projector.
    When we do this, we get jittery playback.

    When viewing the Spout output via Spout Receiver the playback is smooth and fine.

    Our system is:

    MadMapper 3.7.1

    Razer Blade 15
    Intel Core i7-9750 2.60GHz
    16GB RAM
    NVIDIA RTX 2060

    Any suggestions as to why this is happening? And how we might be able to fix it?
  • mad-matt
    garageCube team
    Posts: 813
    Joined: Mon Sep 09, 2013 5:50 pm

    Re: Spout to MM > Jittery Output / Spout to Spout Receiver > Smooth Output

    by mad-matt » Mon Sep 16, 2019 12:18 pm

    The problem is that there's no sync mechanism inside spout. We cannot know when the texture was updated (see http://spout.zeal.co/forums/topic/sender-receiver-sync/). With Syphon we get a callback when the texture has been updated so synchronization is easy. We get a new syphon frame => we produce a new frame based on this new texture.
    With Spout, we're not aware a texture was updated. When using a spout source, we produce a new frame at the frequency of the screen/projector attached to first projector in MadMapper (in youur case, your 4k screen, at 60 FPS I suppose). We're not sure that the other process already published the spout update. Depending on the driver, the OpenGL swap will be blocking or not and synchronization will be better or worst.
    Maybe it will be improved by some developments we're working on to get a better VBL synchronization on Windows.
    Actually testing with another OpenGL application => SpoutReceiver, I also see glitches, without MadMapper involved.
    Maybe Unity => SpoutReceiver works better because both are D3D based.
    At the moment you can try to tweak using SpoutSettings to switch to DirectX9, or change the Share mode. If you see anything better changing those settings, let us know.
    Matt - MM team

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