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

  • Problem—4K video with compressed clip speed via LG 4K TV playback

     Tom Watson updated 1 week, 4 days ago 4 Members · 15 Posts
  • Tom Watson

    September 3, 2021 at 5:09 pm


    The video also sputters on my LG OLED.

    The problem is in your render settings. In checking the video MediaInfo, it shows that you have rendered at a bit rate of 399Mb/s.

    You need to change some settings:

    Encoding profile: Change Main to Main10

    Quality: set to Restrict to 40000Kbps

    Rate Control: set to VBR High Quality

    In Advanced settings set data level to Auto

    I would not limit your render rates as that is only necessary when your computer chokes and crashes.

    Give this a try and let us know. I am off to a wedding rehearsal shoot and will be gone until this evening PDT.

    Here is the Media Info for your file:

    Complete name : E:\Documents\downloads\4k test.mp4
    Format : MPEG-4
    Format profile : Base Media
    Codec ID : isom (isom/iso2/avc1/mp41)
    File size : 1.94 GiB
    Duration : 41 s 642 ms
    Overall bit rate : 399 Mb/s
    Encoded date : UTC 2021-09-01 20:22:03
    Tagged date : UTC 2021-09-01 20:22:03
    Writing application : Lavf58.45.100

    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : [email protected]
    Format settings : 1 Ref Frames
    Format settings, CABAC : No
    Format settings, Reference frames : 1 frame
    Format settings, GOP : M=1, N=30
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 41 s 642 ms
    Bit rate : 399 Mb/s
    Width : 3 840 pixels
    Height : 2 160 pixels
    Display aspect ratio : 16:9
    Frame rate mode : Constant
    Frame rate : 29.970 (30000/1001) FPS
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 1.606
    Stream size : 1.93 GiB (100%)
    Encoded date : UTC 2021-09-01 20:22:03
    Tagged date : UTC 2021-09-01 20:22:03
    Color range : Limited
    Color primaries : BT.709
    Matrix coefficients : BT.709
    Codec configuration box : avcC

    ID : 2
    Format : AAC LC
    Format/Info : Advanced Audio Codec Low Complexity
    Codec ID : mp4a-40-2
    Duration : 41 s 642 ms
    Duration_LastFrame : -1 ms
    Bit rate mode : Constant
    Bit rate : 196 kb/s
    Channel(s) : 2 channels
    Channel layout : L R
    Sampling rate : 48.0 kHz
    Frame rate : 46.875 FPS (1024 SPF)
    Compression mode : Lossy
    Stream size : 998 KiB (0%)
    Default : Yes
    Alternate group : 1
    Encoded date : UTC 2021-09-01 20:22:03
    Tagged date : UTC 2021-09-01 20:22:03

    ID : 3
    Type : Time code
    Format : QuickTime TC
    Duration : 41 s 642 ms
    Frame rate : 29.970 (30000/1001) FPS
    Time code of first frame : 01:20:17;14
    Time code, striped : Yes
    Language : English
    Default : No
    Encoded date : UTC 2021-09-01 20:22:03
    Tagged date : UTC 2021-09-01 20:22:03

  • 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 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 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,


  • 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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