View Only
  • 1.  Lip flap on live video input

    Posted 27 days ago

    Has anyone dealt with live video input into the Xpression and lip flap issues? If so any solutions?

    Michele Lee Hampton
    Graphics Operator
    Hermosa Beach, CA

  • 2.  RE: Lip flap on live video input

    Posted 27 days ago

    Found it was about 10 frames off (doing a temporary full-screen info channel over video that would squeeze in-out).  A standalone audio effects processor could add the matching amount of delay, or if in a control room most modern/digital audio mixers can add the delay as well.

    If the effect shot is only needed during parts of the show it would probably be noticeable to add/drop the delay every time, esp. during music, might get away with it if there's a bit of an audio break and people aren't talking over the transition.

    Some setups with processing-intensive video effects sometimes add video delay to the "clean" camera feeds going to the switcher so that the content remains in time whether it's the camera full screen or processed through a fancy virtual scene/augmented reality shot.   If it's a quick thing maybe create a scene with that same camera material full-screen and output on 2nd or 3rd framebuffer.

    Really depends on the context, have a talk with the director and td so everyone understands the limitations and workarounds.

    There is a low-latency mode in Xpression for faster processing of external video but it comes with limitations, forget exactly what those are.

    Also to reduce your demands on the computer, could you use the same material mapped on the three quads rather than create individual materials since it's the same camera?  May or may not be possible if you're also adding different treatments or masks etc to the camera's video.

    Hope this gives you a few ideas.


  • 3.  RE: Lip flap on live video input

    Posted 27 days ago

    You will need to delay the audio and sync it up after. 

    Simon Redmile
    Senior Graphic Programmer & Designer
    Ross Video
    Bristol United Kingdom