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DaveRizzWork
DaveRizzWork
Inspiring
April 29, 2022
Answered

Photo Flash causing footage rendering problems

  • April 29, 2022
  • 2 replies
  • 2211 views

I'm editing a bunch of fashion related videos, and I'm including some footage of photography shoots, where a still photography flash strobe is occasionally going off. Not always, and not every time in the same edits, I get about a second of weird grey pixelation craziness partially taking over the screen during and immediately after the strobe going off. (I've attached a screen capture)

 

Anybody else having this issue? Any work-arounds?

Project is due in a week, and I need to solve these rendering issues.

Thanks,

Dave

Correct answer DaveRizzWork

Rolling shutter effect is imo only for slanted images not flashes.


Ok, I figured this out. I have a pack of presets from Motion Craver, through VideoHive. They're the "Motion Pro Premiere pack." And I'm using some animated title typography... and that's what is causing the issue!

 

If I render to either H265, H264, or MOV 422 LT, the glitching is always there to some degree.

What is causing it, is having the that "MP_Effects Title 03_ Liquid Fill.aegraphic" on-screen while a flash strobe is going off.

 

No matter what the video format or settings are set to, the rendering works fine on parts of the videos WITHOUT the type on screen. But as soon as those Motion Pro assets are on screen, and the flash goes off, the distortion shows up.

 

So my work-around is to drop a frame or two of a white color matte in the effected flash shots. All good then.

2 replies

DaveRizzWork
DaveRizzWorkAuthor
Inspiring
May 3, 2022

Ok, I figured this out. I have a pack of presets from Motion Craver, through VideoHive. They're the "Motion Pro Premiere pack." And I'm using some animated title typography... and that's what is causing the issue!

 

If I render to either H265, H264, or MOV 422 LT, the glitching is always there to some degree.

What is causing it, is having the that "MP_Effects Title 03_ Liquid Fill.aegraphic" on-screen while a flash strobe is going off.

 

No matter what the video format or settings are set to, the rendering works fine on parts of the videos WITHOUT the type on screen. But as soon as those Motion Pro assets are on screen, and the flash goes off, the distortion shows up.

 

So my work-around is to drop a frame or two of a white color matte in the effected flash shots. All good then.

    Averdahl
    Community Expert
    AverdahlCommunity Expert
    Community Expert
    April 29, 2022
    quote

    ...I get about a second of weird grey pixelation craziness partially taking over the screen during and immediately after the strobe going off. (I've attached a screen capture)


    By @DaveRizzWork

     

    Rendering as render the timeline or render as in exporting the footage? If the latter, try to use the QuickTime as Format and export a short clip as Apple ProRes LT and see how that looks.

     

    Where does the source footage come from, iow video camera, smartphone, or?

      DaveRizzWork
      DaveRizzWorkAuthor
      Inspiring
      April 29, 2022

      Ok, I'll try that. And I meant rendering out an edit. The playback of the rendered timeline does not seem to cause the error. It's just when I render out the edit as a new file.

       

      And the original footage is from a Canon R5, and in the original footage, there is about two frames of flash, that basically shows like 2/3 of the frame as blasted out white, and that 2/3 of white moves down the 2 frames, but I don't see any other errors or distortion other than those 2, possibly 3 frames (at most) of partial white.

      R Neil Haugen
      R Neil Haugen
      Legend
      April 29, 2022

      It's the duration of the flash working against the camera's travelling shutter that's your problem. And that's a real bugger at times ... because it's only affecting part of the frame.

       

      Neil

      Everyone's mileage always varies ...
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