[Tom Watson]

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.

[Tom Watson]

Karl,

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:

General
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

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L5.1
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

Audio
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

Other
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

[Tom Watson]

Karl,

I started the file download, but it is very slow so will take some time.

[Tom Watson]

Karl,

It appears you have gone through a similar diagnosis as I would do. The results point to a issue with your LG OLED TV.

If you send a link to download the video, I will test it on my LG OLED TV. That should tell us whether or not there is a problem with the video itself.

I have two LG TVs, the OLED and a regular TV, so I can test on both.

Another thing you can try is to render the video in HEVC (H.265) and see how that plays. HEVC does require a lot more effort by your computer to render, but the video data stream in the rendered video is much smaller and easier for a device to play back. If you do that, set your bit rate to at least 20,000 Kbps for quality purposes.

I agree. Rendered video is rendered video. Fast forwarded segments should only stress the rendering process. My computer always slows down when processing the speed change areas.

[Tom Watson]

I have a similar set-up. i9-9940, and have done many similar videos with sped-up portions of some clips. I have last years model LG OLED TV and have no problem playing 4K 10 bit HDR MP4 or MOV clips processed in Resolve Studio (always the latest version). So, I do know what you are trying to do can be done and do play on LG OLED TVs.

More info is needed to narrow down your problem:

1. Do any videos on your SSD play on the LG TV? Videos from another source? Videos played from a USB 3.0 Flash Drive?

2. Do the videos on your SSD play on any other device such as your computer and/or another TV?

3. Are you using the free version of Resolve, or the Studio version?

4. What bit depth video are you using and rendering?

5. Have you tried to render this video in MOV? If so, results?

The more info you can provide the easier it will be to find the problem.

There are many settings in Resolve that must be correct. The DaVinci website has some helpful videos for the basic settings that become critical when you move to 4K. There are a few good ones on You Tube, and a large number of videos that will lead you astray. Provide enough info, and there are some very talented people on this forum that can help.

[Tom Watson]

Are you sure the original footage is 23.976 fps?

[Tom Watson]

In my experience you should to set your Output color space to Rec.709-A for best results with iPhone footage.

[Tom Watson]

Windows or Mac? This sounds like an operating system setup issue.

On a Windows machine applications may not be available in accounts added later. You can try reinstalling the application and choose to make it available for all users.

[Tom Watson]

Another option is to purchase a Dongle. I have both a license and a Dongle, and find having the Dongle quite handy when I want to take a project to another computer.

[Tom Watson]

I have no idea what caused the problem. I always use the latest beta version of Resolve when they are beta testing. It was in beta when this was happening, and I have not seen the problem since the last stable version was released. So it may have been a software glitch that was fixed.

The bottom line was that I was always able to recover the timeline and never lost anything.