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Activity Forums DaVinci Resolve Problem—4K video with compressed clip speed via LG 4K TV playback

  • Karl Buhl

    September 4, 2021 at 8:16 pm

    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

  • Karl Buhl

    September 4, 2021 at 8:18 pm

    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

  • Karl Buhl

    September 7, 2021 at 1:04 am

    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

  • Tom Watson

    September 7, 2021 at 5:01 am

    It’s all in the settings. If you look at the Media Info I sent for your i9 rendered file, you can see that you have a bit rate of (399Mbps) 10 times that normally used for a H.264 rendered file. Then look at Bit depth only being 8 bit. Chroma subsampling of 4:2:0. Color range of Limited.

    That’s a low quality file with a very high bit rate.

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