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Benjamin5D91
Participant
July 11, 2022
Answered

Lumetri Color flashing on and off on various clips in sequence and in renders

  • July 11, 2022
  • 2 replies
  • 1718 views

Example of the issue:

https://www.youtube.com/watch?v=vAkYQ2g7qVM

 

 

So what's happening is the Lumetri color on this clip appears to be flashing on and off. I see it in my timeline and in the export. There are no other effects applied to my clips. It's happening to many clips, but not all. And not to every instance of a source clips (IE: sometimes I cut back to this single interview clip at different times and the flickering is not present). This is week 2 with this issue. What I have tried so far:

 

I have updated premiere

updated video drivers twice

exported from 2 different similar PC machines

purged my cache and render files

exported in premiere and in media encoder

copied everything into a new sequence in a new project

Fianly, the most success I've had so far is disabling GPU acceleration when exporting in Media Encoder. It trippled my render time but I only got three flashes in the whole 3min video. But that's still an unacceptable problem. Thoughts?

 

Project Specs:

3840 x 2160
29.97 fps
48000 Hz - Stereo
Color Space: Rec. 709

Footage is a mixutre of MP4 and MXF

 

Computer Specs:

Processor Intel(R) Core(TM) i9-9920X CPU @ 3.50GHz 3.50 GHz
Installed RAM 64.0 GB (63.7 GB usable)

GPU NVIDIA Quadro P4000

GPU Driver: 516.59
System type 64-bit operating system, x64-based processor

    This topic has been closed for replies.
    Correct answer Michael Grenadier

    Also, another thing that seemed to work with some troublesome mxf files was to change the file name extension from .mxf to .mpg.  I'd duplicate the file first...  This was Ann Bens suggestion.  Credit where credit is due...

    2 replies

    M
    Michael Grenadier
    Legend
    October 4, 2022

    saw this intermittent problem working on a large 4k documentary project..  much of the material was .mxf.    Try this.  select a clip in the bin/project. right click and choose modify:  interpret footage.  Go to the bottom of the modify window and see if the media color space is anything but rec709.  If it is, enable color space override and choose rec709.  This solved my problem and also solved the problem on the proxies from this material without needing to modify the proxy files.

     

    M
    Michael GrenadierCorrect answer
    Legend
    October 4, 2022

    Also, another thing that seemed to work with some troublesome mxf files was to change the file name extension from .mxf to .mpg.  I'd duplicate the file first...  This was Ann Bens suggestion.  Credit where credit is due...

      lliving6
      lliving6
      Participant
      October 6, 2022

      I tried both, and it seems to be fixed.  Thanks for the help!

        B
        Benjamin5D91Author
        Participant
        July 11, 2022

        Additional Info:

        Here is an exmple of the full video:

        https://youtu.be/jxubAgQFDGk

         

         

        You'll see the glitch is periodic. This was done in Media Encoder with software rendering only (no GPU accelleration). Every time I try a new fix the location of the glitch in the timeline changes. The only thing that seems constant is that it looks like only my MXF clips are effected. While my MP4s are behaving. And no its not feasble to transcode all my MXFs just to get this project to work.

        Kevin J. Monahan Jr.
        Kevin J. Monahan Jr.
        Legend
        July 11, 2022

        Hi Benjamin,

        Sorry about that. My only suggestion is to transcode the .mxf files until the issue has been worked out. I see others on these forums having problems with certain codecs and .mxf, so I suspect a bug is afoot. I would roll back to an earlier version or target those files for transcoding. I'll look into this issue soon after I return to my desk. 

         

        Thanks,
        Kevin

        Kevin Monahan - Sr. Community and Engagement Strategist – Adobe Pro Video and Audio
        B
        Benjamin5D91Author
        Participant
        July 20, 2022

        Unfortunatly the problem persists. I have been able to confirm that the culprit is any footage in .mxf. It happens in all my projects. Transcoding all my MXF files to ProRes is not a viable solution as I have 6 years and growing worth of archival footage shot in MXF that I regularly use in different projects. Exporting the project sequence to ProRes and then transcoding that to an mp4 partially works, although sometimes that process Premiere will just completely ignore lumetri on random clips. This is also not an acceptable solution because beyond not working 100% it doesnt fix the fact that these clips are flashing in my timeline while editing them which makes editing a nightmare. 

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