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Question

Superwhites / Highlights Clipped in v15, v22

Forum|Forum|4 years ago
November 23, 2021
3 replies
2465 views

My camera (Sony FS5) records superwhites / highlights above 100 ire. New versions of Premiere Pro are clipping these details.

In previous versions of Premiere Pro, through v14, superwhite details are visible on the YC waveform and Luma waveform. The corresponding area of the image will appear overexposed, but after correcting the exposure in Lumetri the hidden details from those highlights become visible.

In more recent versions, everything over 100 ire appears clamped. The waveform is clamped and the details in the image are no longer recoverable.

The attached screenshots compare v14.3.2 with v15.4.1. The issue is still present in the latest v22.

Is anyone else having this issue? Are there settings in the newer versions that can correct this, or is it a bug? I would greatly appreciate any help, as this issue basically means I can't use any of the newer updates in my workflow.

Let me know if I need to provide any additional details, I'm trying to keep it concise.

Error or problem

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Aaron PateAuthor

Participating Frequently

Hey Adobe - 2 Years later and I'm still paying $60/mo to use v14. None of the updates have fixed this issue. Premiere is misinterpreting MXF footage from the Sony FS5. If anyone has a solution for this I'd really appreciate the help.

R Neil Haugen

Legend

Do you have a clip you could upload/share? I'd love to test on my rig.

Everyone's mileage always varies ...

Aaron PateAuthor

Participating Frequently

Thanks @R Neil Haugen ! I've put a small piece of raw footage here at this Dropbox link for anyone to test: ClippedHighlights_Sample02.MXF

The screencaps posted above by @Jeff Bugbee show the issue perfectly.

Jeff Bugbee

Community Expert

Also, if you can post a short video clip with a video over 100 IRE, I can test on my Mac to see if the same thing happens (I see you're on Windows)

Aaron PateAuthor

Participating Frequently

Thanks Jeff!

At first I tried to export a clip, to avoid sending you raw footage. I exported from v14 of course, where I know the highlights are present, and I imported this file back into both v14 and v15 to check that the issue was still present. I was surprised to find that the superwhites in the export were displayed correctly in both versions of Premiere!

So this lets me know that Premiere Pro v15+ is capable of displaying the data correctly, it just isn't interpreting my Sony FS5 footage correctly.

Still, I think it would be helpful to know if another v15+ user experiences this issue, and to involve the Mac v PC variable as well. I've put a small piece of raw footage here at this Dropbox link for you to test: ClippedHighlights_Sample02.MXF

Thank you for taking the time to help me investigate this!

Jeff Bugbee

Community Expert

Thanks for the sample! My M1 Mac on the latest version of Apple silicon Premiere (v22) has the same issue as your v15.

However, I rewrapped the MXF into a MOV container and lo and behold - Lumetri shows no clipping. Note this is a rewrap, not a transcode, so the video stream was not altered in any way. It looks like Premiere is reading something in the metadata and causing it to show clamped in Lumetri. I tried rewrapping just the MXF and dropping metadata but that also showed the clamping.

I'm going to guess this is a Premiere bug, perhaps specifically isolated to MXF files (I don't have other media to test with). Would love to hear @R Neil Haugen and @Kevin-Monahan 's takes on this as well.

edit: playing with the levels, it does appear the MXF import is destructive. But I'm no color expert

Jeff Bugbee

Community Expert

It looks like the clamp signal box is checked, even though it's not. Have you tried toggling that checkbox on/off to see if it's just a UI bug?

Do you have any broadcast safe/video limiter effects on this clip?

Aaron PateAuthor

Participating Frequently

That's a good way to describe it, that's exactly how it behaves. I tried that, and toggling the checkbox alters the graph but makes no change to the signal.

There are no effects on the clip.

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