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  • 1.  NDI Output Glitch on Clear Framebuffer

    Posted 10-26-2022 03:40
    Hi,

    I just tested an NDI Output Framebuffer these days, just "playtime"...

    It works fine except when I clear the Framebuffer with Ctrl+F1...F2... (clear all Layers on FB), in most cases I get a "dirty" bit of a frame left on the output (fill and/or key) when I monitor the NDI Stream. Soetimes it would clear to clean Fill+Key fine (very rare) most times it just flickers one black frame and then leaves the last frame of the prior content on screen, sometimes it would leave a glitched half area of the key-content there and so forth. In either case the output is NOT cleared properly.

    BUT: it always works, when I replace the prior content with an empty scene. But this is not an option as this would only clear one specific layer on the output, not all. Plus I am used to clear framebuffers by the default keyboard shortcut instead of putting an empty scene online...

    Can anybody help me with this issue?

    XPression Studio 7.1
    NDI Tools 5 installed for monitoring the stream, but with other endpoint software for monitoring it is the same. So I would suggest it is an XPression issue.

    It all happens on the same machine, so a poor network connection is likely not the cause!

    Can anyone at least confirm that or even provide a solution?

    Thanks in advance!

    ------------------------------
    Sefa Aydemir
    On Air Visuals / Switchers and Live Graphics Specialist
    MMC Studios Cologne
    Cologne Germany
    ------------------------------


  • 2.  RE: NDI Output Glitch on Clear Framebuffer

    Ross Staff
    Posted 10-26-2022 11:18
    Hello,
    This is a known bug in XPression version 7.1. It is resolved in XPression version 8.7 build 4708 and higher (beta). The lowest released version with this bug resolved is XPression version 9.0. 

    From XPression change log:
    • [fixed] taking the last item offline on an NDI framebuffer could sometimes fail to properly clear the output



  • 3.  RE: NDI Output Glitch on Clear Framebuffer

    Posted 10-26-2022 12:02
    Hi Garner!

    Thank you for the reply! Ok, I was not aware of that. Then I don't have to test and google around any more with this version... :-)

    Regards
    Sefa

    ------------------------------
    Sefa Aydemir
    On Air Visuals / Switchers and Live Graphics Specialist
    MMC Studios Cologne
    Cologne Germany
    ------------------------------



  • 4.  RE: NDI Output Glitch on Clear Framebuffer

    Ross Staff
    Posted 10-26-2022 12:18
    This info may also be of some interest:

    NDI Libraries XPression Version Implementation

    XPression v10.7 build 5586 - NDI Library v5.0

    XPression v10.1 build 5417 - NDI Library v4.6

    XPression v9.7 build 5065 - NDI Library v4.1

    XPression v8.7 build 4708 - NDI Library v3.5

    XPression v7.1 build XXXX - NDI Library vX.X (assume v3.0?)

    XPression NDI Feature-set

    • Output fill+key (v8.0+)
    • Input fill (v8.0+)
    • Audio 8chs (v8.7+)
    • Input fill+key (v10.1+)



  • 5.  RE: NDI Output Glitch on Clear Framebuffer

    Posted 10-26-2022 13:56
    Hi Garner,

    wow, that's good to know, thank you for sharing this information of the used NDI libraries!

    Just a for the sake of completeness:
    I saw v7.1 ...
    - with its NDI output working with fill+key (and optional fill only) but it does not deliver audio
    - with its NDI input capable of processing fill but no key (and I assume no audio, not tested)

    Please correct me if I am wrong...

    Nevertheless the clear framebuffer glitch persists, and that is what I wanted to find out!

    with appreciation
    Sefa

    ------------------------------
    Sefa Aydemir
    On Air Visuals / Switchers and Live Graphics Specialist
    MMC Studios Cologne
    Cologne Germany
    ------------------------------



  • 6.  RE: NDI Output Glitch on Clear Framebuffer

    Ross Staff
    Posted 10-26-2022 14:14
    That sounds correct. I think I had modified the list above to show released versions for the NDI featureset. But you are correct, NDI fill+key output was added in 7.1. Audio was added in v8.7 (or v9.0 release).