Photo Flash causing footage rendering problems

[DaveRizzWork]

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

[Averdahl]

...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]

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]

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

[Ann Bens]

You will have to edit out the partial white frames manually.

Most of the time you wont even see they have been edited out.

[DaveRizzWork]

Yeah, I was thinking this would be my last resort. lol.  I'm editing 13 videos, and across them all, there's a lot of flashes... but I think what I might do, is create a color matte that's only 3 frames long, and just drop it on top of flashes... 🤷‍:male_sign:

And I'm rendering the 422 LT version now, (without any white blocker mattes) to see if it was the H265 processing that was making the flash mangle so much more of the frames. I will report back on how it goes.

[Averdahl]

...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.

By @DaveRizzWork

That´s beacuse the camera uses a CMOS sensor and that will give you rolling shutter issues such as this issue, iow problems with camera flashes. Try the Rolling Shutter Reapir filter that can be located in the Effects panel. I am unsure if that filter fixes camera flashes. I have no test files to test with at the moment.

Are the source files from the camera .mp4 or .mov?

[Ann Bens]

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

[DaveRizzWork · Accepted solution]

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.

[DaveRizzWork]

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.