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Activity Forums Adobe Premiere Pro Weird artifacts/glitchy patterns on video/timeline preview

  • Weird artifacts/glitchy patterns on video/timeline preview

    Posted by Çağan Çelik on June 7, 2024 at 5:56 pm

    Hey there,

    I’ve been editing some footage taken with iPhone 15 Pro and noticed some weird patterns with my footage recently. Sometime colorful dots, sometimes lots of tiny horizontal rectangles and flickering. They are not present in the source material or exported video. It just appears in timeline playback. And they are random. They sometimes go away when I minimize and maximize Premiere or scrub and play the clip again.

    Here’s a short clip that shows the issue clearly: https://youtu.be/jwa64hFLmII

    You can see the glitch pattern on the screen when I’m viewing that clip. Pressing space and replaying it reproduces the pattern. But as soon as I switch to another clip and go back to the problematic clip, the pattern disappears… Only to reappear somewhere randomly again.

    Source material encoded in HEVC. 2160p and 59,94 FPS. But Premiere also says “Variable Frame Rate Detected” in the file properties window.

    My system:

    AMD Ryzen 9 5950x CPU
    ASUS B550 motherboard (latest bios)
    64GB DDR4 3600 MHz ram
    Nvidia Geforce RTX 4080 Super 16GB GPU (Studio Driver 555.99)
    Samsung 990 Pro2TB SSD
    Windows 11 23H2
    Premiere Pro 24.4.1

    So far I tried:
    -Uninstalling Nvidia Studio drivers with DDU app and then reinstalling.

    -Uninstalling and reinstalling Premiere.

    -Resetting to saved layout in Premiere.

    -Deleting media cache in Premiere.

    -Checking power connections of the GPU, reseating GPU.

    None seems to solve the issue.

    I’m not sure but I’ve also observed similar patterns on other types of footage (Sony XAVCS) especially when I add some other clips into the mix that I downloaded from YouTube or images from the internet.

    The GPU never does that when I’m playing videos outside of Premiere. It also never does that in 2D/3D apps/games. This seems to be unique to Premiere.

    I’m also using CapCut to edit same videos, it also uses GPU decoding just like Premiere but it nevers shows the glitches.

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    Çağan Çelik replied 3 weeks, 6 days ago 4 Members · 8 Replies
  • 8 Replies
  • Rob Ainscough

    June 7, 2024 at 6:39 pm

    I’m almost certain this is a problem with your GPU (Nvidia Geforce RTX 4080 Super 16GB GPU). Couple of recommendations:

    1. Monitor GPU temps during the issue

    2. Reduce the VRAM and GPU max frequency to see if the problem goes away

    3. Verify you have good connectivity between GPU and monitor and using appropriate specification cable to meet LCD of port version (i.e. HDMI 2.1b or DP 1.4).

    Cheers, Rob.

  • Çağan Çelik Create COW Profile Image

    Çağan Çelik

    June 7, 2024 at 6:47 pm

    Could it be because the DisplayPort cable version? My monitor has 2 options in the OSD menu, under the DisplayPort version: 1.2 and 1.4.

    I’m using a DisplayPort 1.2 cable and still was able to pick 1.4 option there and successfully ran my monitor at 3440x1440p 160Hz 8bit.

    When I choose 1.2 in the monitor, refresh rate drops down to 100Hz.

    This is the cable I’m using: https://www.amazon.com.tr/dp/B00B2HOVRI?ref=ppx_yo2ov_dt_b_product_details&th=1

  • Rob Ainscough

    June 7, 2024 at 6:53 pm

    If could be the cable, but why are you operating at such high refresh frequency? Is your footage recorded at higher than 60 fps?

    I would try operating at 60 Hz refresh.

    If you have an HDMI option and cable, try that also.

    But do check your GPU/VRAM frequency and temps first, easy test, easy to reduce slightly to see if that solves it.

  • Çağan Çelik Create COW Profile Image

    Çağan Çelik

    June 7, 2024 at 6:58 pm

    I don’t think temps are the issue because the cooler on my GPU is so badass haha. It’s MSI Suprim X version.

    I also game with it and using apps like MSI Afterburner and Riva Tuner Statistics Server to monitor GPU temp, frequency etc… in real time. None were high. In fact GPU temps never exceeded 60 degrees under %100 load.

    But I’m leaning towards the cable issue. The cable can run 1.4 but isn’t certified for it so extra bandwidth stresses it out, causes glitches maybe?

    I’m running at high frequency because it feels more fluid when working. Why is it bad to crank it up?

  • Mads Nybo jørgensen

    June 7, 2024 at 7:08 pm

    Hey Çağan,

    Could be an fields issue (even back at camera imaging chip capture)?
    What are your settings for the sequence?

    Maybe for a quick test pop the footage through media-encoder and import as ProRes – do two files, one interlaced and one that is progressive.
    ProRes in HQ will be a better “container” for something possibly encoded in Long GOP.

    Adding to Rob’s great suggestions, my 1st thought was the cable.
    <div>Do you have other option out like HDMI?</div>

    Atb
    Mads

  • Rob Ainscough

    June 7, 2024 at 7:14 pm

    Drop the refresh to 60Hz … it will be just as fluid for most humans. Test with that and see if the issue remains.

    DP 1.2 is an old spec. DP 2.1 is current spec. DP 1.2 doesn’t actually list 144Hz 10bit 1440p as a valid resolution for the standard … it has a max 21Gbps data xfer vs. 2.1 spec at 77Gbps xfer (with DSC compression). HDMI 2.1b you can run 112Gbps xfer (with DSC).

  • Alex Cly

    June 10, 2024 at 1:37 pm

    this is a problem in the Nvidia drivers, I am seeing the same artifacts on the RTX 3060, in order for everything to work well you need to manually install the 552.22 or 552.44 driver. I already wrote a review to Nvidia, but so far they have not fixed this error.

  • Çağan Çelik Create COW Profile Image

    Çağan Çelik

    June 16, 2024 at 12:45 am

    Seems like you are right. I changed the DisplayPort cable. But the issue persists.

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