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  • Hi Kenneth. I logged into Creative Cow today, read your question, and empathize. I don’t have a clear answer, but I have a few ideas.

    The fact that you are seeing the video artifacts in both source and timeline viewers suggests a hardware problem—to me, anyway.

    The first flag for me is that you are attempting to view UHD (3840 x 2160) video, but your monitor is set to 2560 x 1440. You have a mismatch between what you’re attempting to play, and what your monitor is capable of delivering. My guess is, this might be what’s causing the bad video in Resolve—particularly because both the source and timeline viewers are scaled down (e.g. not full-screen).

    Your graphics card and monitors appear to be capable of supporting UHD. So, why is Windows recommending 2560 x 1440? Something’s amiss.

    Go into Windows settings and see if you can set the resolution to the higher 3840 x 2160. If Windows doesn’t give you an option higher than 2560 x 1440, Windows thinks you don’t have a UHD monitor attached. The question is why. If you can’t figure it out, call MSFT tech support to ask them.

    Before you do that:

    > Check to ensure your video cables are up to spec.

    > Open the GeForce Experience software to update the RTX 2070 driver to current version.

    > Update DR to the most current release version (mine is 17.4.6 build 4).

    > Update Windows to the most current version. Are you using Win 10 or Win 11? If Windows 10, then upgrade to Windows 11. If Windows indicates that your PC isn’t capable of the upgrade, that may be another clue that your motherboard isn’t fully capable of supporting UHD.

    (I’m sure you’ve done all the above, but just double-check those steps before you call MSFT.)

    Some ideas for you.

  • Michael—I purchased the pro version of the Voxengo resampling software (I like to support boutique developers), converted the audio clip from 44.1 / 16-bit to 48 / 24-bit—and I still had the same problem. At that point it should have worked, so I concluded that the DaVinci file was corrupted.

    I deleted the file, started from scratch, imported the re-sampled audio clip, and everything was fine. Not sure how the DVR file got corrupted, but that was the problem.

    Thank you for the intro to Voxengo. Does his plugins work with fairlight, or only with DAWs? Does his plugins work with Studio One?

    Thanks again,

    Cheers,

    Karl

  • Karl Buhl

    January 28, 2022 at 2:02 am in reply to: Red dots appearing on text

    Jean, try doing a test render of that segment to determine if the red dot appears in the final rendered video. My guess is that you won’t see it in the test render.

  • Karl Buhl

    January 28, 2022 at 1:59 am in reply to: Sound disappeared

    Jean, the green fill of the clips indicates that DaVinci sees the files on your hard drive. Otherwise you would see the red missing media icon. So, the only thing that comes to my thought is that the files are corrupted. One test is to open the source files on the hard drive and see if they play outside of DVR. That would indicate if the source files are corrupted, or not.

    Assuming you have original copies of the audio clips, have you tried to delete them from the drive and folder location, and re-copying to the appropriate DVR folder and re-linking the files?

    Is your hard drive running directly off the motherboard, or is it on a USB drive or a network drive. Possible that it’s a cable problem or hard drive corruption.

    Possible, but not likely, that DVR is corrupted. You could try re-installing DVR.

    Sorry, that I’m guessing here, but those are my ideas for isolating the problem.

  • Hi Michael. Thanks for your suggestion.

    The audio clip was originally sampled at 44.1. I used Audacity to resample up to 48 (Audacity makes re-sampling very easy.) The problem continued with the up-sampled 48 kHz clip.

    I added a separate audio track for this new 48 kHz clip, used the audio waveforms to visually sync with the video, and ran a sample render. The audio rendered normal speed perfectly in sync with the audio. Very strange.

    Do you think the bit depth would impact this? I think the re-sampled clip was @ 32-bit variable instead of 24-bit.

    I’d like to eventually figure out the problem, but at this point I probably won’t spend the time to chase it.

    Thanks for your assistance.

    Cheers,

  • Karl Buhl

    September 7, 2021 at 1:06 am in reply to: KEYBOARD SHORTCUT TO ADVANCE COMPLETE FRAME?

    I believe Shift + right arrow advances 1-frame in DaVinci Resolve.

  • One final, follow-on question. The final AMD-rendered files are 40%-50% smaller than the same files rendered via the Intel i9.

    Why would the final AMD-rendered file size be so much smaller? Am I sacrificing video quality using the AMD Radeon RX 570 video card?

    Thank you,

    Karl

  • Hi Tom. Thank you for all of your suggestions. See my previous response to Paul—when I rendered through the AMD Radeon RX 570 card … problem solved.

    I will look at all of your suggested settings to determine if these variables change the outcome in any way.

    Thank you for digging in. Greatly appreciated.

    Karl

  • Paul—Thank you for your response—and for clearly explaining the codec compression issues. Your description of the issues makes perfect sense because, yes, each video frame changes.

    You provided me with several ‘ah-ha’ moments. The first of which was an assumption (bias) that the onboard Intel i9 would out-render the graphics card. My graphics card is an AMD Radeon RX 570. Not super high-end. But certainly adequate.

    Many of the options you suggested to try in DaVinci are only available when selecting the graphics card as the rendering engine. So my first test was to simply render through the Radeon card.

    That solved the problem. The test video played perfectly through the LG TV without changing any other settings.

    Uncertain why the i9 wasn’t up to the job. But thank you for your suggestions that led me to a solution. Greatly appreciated.

    Karl

  • After clearing this with COW’s managing editor, here are two links if anyone wants to dig in further:

    1. Link to my ~ 42-second test video. The first scene plays normally on the LG TV. When it gets to the fast-forward segment, then it fails (per the above descriptions). (Download link expires in 1-month.)

    https://karlbuhl.filemail.com/d/phutbtifquzyqlt

    2. Link to specifications for the LG OLED-77C1AUB.AUS:

    https://www.lg.com/us/tvs/lg-oled77c1aub-oled-4k-tv

    Thanks again to all those helping me analyze this.

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