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Participant
September 7, 2023

Premiere Pro Video Limiter doesn't clip pixels below 0 or above 100 IRE

  • September 7, 2023
  • 4 replies
  • 1168 views

The old Video Limiter (Legacy) properly held IRE levels to between 0 and 100 IRE (or however you set it).
The current Premiere Pro (Ver 23.6.0) Video Limiter looks just fine on the Lumetri scopes. But after export, there are STILL pixels below 0 and above 100 IRE. And it doesn't matter whether the limiter is on the clip in the timeline, or on an adjustment layer above.
Take the exported file, plunk it back into a fresh timeline, and all those out-of-range levels are still there.
You're audio folks understand what a limiter is — no signal goes beyond (signal limit goes here).
I understand that the YouTubers and TikTokers of the universe don't give a pixel about IRE levels. But those of us in the broadcast world — you know, your original customers — NEED to have functions that, well, function. Otherwise, our content doesn't get broadcast, and we don't get paid.
We need a Video IRE Limiter that CLIPS the signal to the correct level and doesn't just fudge some compression and call it a day.
(The attached screen cap shows the IRE levels AFTER export using the video limiter — then re-imported into a blank Premiere timeline.)

4 replies

Participant
April 10, 2024

Hi @mattchristensen !

 

We still run into this problem consistently with our exports.

 

An uncompressed ProRes file is always legal, when exported with the limiter effect,

but that's not much use to us, since our deliverables are AVCI 100 most of the times.

 

Did you guys have a chance to look into this problem yet and find a way to fix this?

 

Just The Best!

 

Michael

R Neil Haugen
Legend
September 8, 2023

Matt,

 

That is interesting information. And useful.

 

In the Resolve manual, all 4,000 plus pages (and that is a literal figure) ... at some point is a detailed chart showing the exact order of processing of every thing the app can do. Which is used at times from experts like Marc Weilage to explain why certain things happen differently than the users expect.

 

I would imagine that might also be useful for Premiere Pro users ... to have that specific a chart. 

Everyone's mileage always varies ...
mattchristensen
Legend
September 8, 2023

@John Bretschneider I'm aware of two concerns that can lead to levels beyond the limiter on export. Do either of these apply to your situation?

  1. Scaling: are you scaling the frame size in your export settings? If so, that scaling operation is happening after the limiter effect and so may introduce out of range values.
  2. Compression: exporting to a lossy codec can cause high-frequency quantization or other artifacts like ringing. Again since this is happening in the very last step of the chain (the encoding) it's well past the limiter effect. To rule this out, could you compare doing your export to a lossless codec (DPX, etc) or even a full quality ProRes and see if you still get out of range values compared to MP4?

 

Thank you

R Neil Haugen
Legend
September 7, 2023

@mattchristensenor @Wes Howell  ... comments, please?

 

I've noted the same thing in the past, especially with certain text/graphics elements and also any sharpening.

Everyone's mileage always varies ...