Inspiring

Question

Exporting 4K footage to 1080 not working properly

Forum|Forum|1 year ago
March 7, 2025
4 replies
535 views

I have 4k footage of a talking head on green screen. I brought it into Premiere to get the multiple takes edited, in this case really just four segment for a total of 90 seconds. Dynamic linked it into AE for keying and color correction. Then back in Premiere added a lower third, logo on front and back, and music. All of this works perfectly and exports in 4k just fine. I need to deliver in 1080 h264 though, and now the problem. Every export is glitchy and blocky. I've exported from Premiere and Media Encoder, tried every preset for 1080, upped the bit rates, rendered the AE comp and then brought into Premiere to avoid pulling it through Dynamic link. No matter what I've tried, the export has is filled random glitches and blocky artifacts through out.

This is a brand new Thinkpad P16 Gen 2. Windows 11, 96GB mem, i9, Nvidia RTX 5000 Ada, all Adobe software is freshly downloaded latest versions.

I'm kind of at a loss at this point having never had this issue in the past. Any ideas why this is happening?

Thanks

J

JamesAMore

Participant

Following up with my previous post:

After doing some experimentation, we figured out that this appears to be an issue with the Nvidia RTX 5000 Ada Series Graphics Card and its drivers when playing back H.264 video at 1080p resolution. The video we found to cause the issue most reliably has slow moving lines in the bottom 1/8th of the screen.

The issue happens regarless of if Adobe or some other software is used to render the video.

Increasing the bitrate seems to help, but doesn't make the problem go away.

The only workarounds we have found is to use a different resolution, such as 4k, or a different codec such as H.265.

J

JamesAMore

Participant

We are having the same issue, exporting H.264 video at 1080p with a Nvidia RTX 5000 Ada. The video in question has slow moving lines, and the artefacts appear in the lowest 1/8th of the video screen.

I work in our IT Help Desk, and have three identical desktops with the 5000 Ada, and they all have this problem.

I've tried new drivers, different video players, and nothing I have found so far seems to work. The only thing that does work is disabling hardware graphics acceleration, but that defeats the purpose of having a graphics card thats $5000.

I suspect its something with the rendering and decoding hardware acceleration of the 5000 Ada.

Did you ever figure out a solution?

ScaseyAuthor

Inspiring

My issue was exactly the same...artifacts were always around the lower thirds, which caused me to think it had to do with alpha channels during exports. But after checking/updating every driver and piece of software on the laptop, nothing seemed to fix it. I finally realized there was an firmware update available for my Dell 4021 monitor. Once I managed to get the firmware updated and then reinstalled drivers, everything worked ok. Are you using the laptop screen or external monitors? Maybe check for that update. I don't understand why it only affected the lower part of the video, but this did fix it.

J

JamesAMore

Participant

I've seen this issue on two identical desktops, but four different versions of monitors. I doubt the monitor has anything to do with this problem, but checking for BIOS updates in general would be a good next step. Thanks.

MyerPj

Community Expert

Did you try using the 4k output to create a 1080p version? Output the 4K in ProRes, and then using Media Encoder or something like https://www.shutterencoder.com/en/. Transcode to the 1080p you need.

Peru Bob

Community Expert

Try updating or rolling back your graphics driver directly from the video card manufacturer’s site. Do a clean installation of the latest Studio Driver (NOT the Game Driver).

ScaseyAuthor

Inspiring

Thanks for the tip. Unfortunately it is still causing the same issue. Any other ideas?

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