After installing the November update on my Vero4k+ I’m seeing stuttering/jerky playback on 4k60p HDR mkv content. It stutters and jerks every few seconds. Gemini Man and Billy Lynn’s Long Halftime Walk are the only 4k60p movies I have and they both do it. No problem with 4k24p HDR or 1080p SDR content.
To get a better understanding of the problem you are experiencing we need more information from you. The best way to get this information is for you to upload logs that demonstrate your problem. You can learn more about how to submit a useful support request here.
Depending on the used skin you have to set the settings-level to standard or higher, in summary:
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enable debug logging at settings->system->logging
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reboot the OSMC device twice(!)
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reproduce the issue
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upload the log set (all configs and logs!) either using the
Log Uploadermethod within the My OSMC menu in the GUI or thesshmethod invoking commandgrab-logs -A -
publish the provided URL from the log set upload, here
Thanks for your understanding. We hope that we can help you get up and running again shortly.
OSMC skin screenshot:
Thanks for the quick response. I enabled logging and now I can’t reproduce the problem. Not sure what was going on before but I’ll post a log if it happens again.
Do you have subtitles switched on? It might be smoother without.
FWIW: we recently got Billy Lyn to play without issues when subtitles are on. But this is on a newer kernel.
Yay! 
Did some more testing and figured out how to reproduce the jerky playback on 4k60p. It happens when returning to the library view and selecting a 4k60p title like Gemini Man while a movie is playing in the background. I do this quite often to prevent a display resync which is excruciatingly slow on my JVC RS3k projector. Subtitles are off.
Also switched to nfs mounting with fstab thinking that might help but it didn’t make a difference. Iperf3 results were 940Mbps using a wired connection.
This is likely caused by the fact that you have whitelisting enabled.
You should also have Adjust Refresh Rate set to Always and not On Start / Stop.
Just tried disabling whitelist and turned refresh to always and it did not fix the problem.
Please post some new logs demonstrating this
Thanks
Sam
Thanks.
2021-12-12 08:43:22.254 T:2740 INFO <general>: Display resolution ADJUST : 3840x2160 @ 59.94 - Full Screen (40) (weight: 0.000)
Can you post the MediaInfo for Gemini Man?
You should also check for updates and make sure that your system is fully up to date
Cheers
Sam
When I turned on the TV this morning there was a message on the screen about an available update. I installed the update but it didn’t fix the problem.
General
Unique ID : 69145041188240402997089821740417354596 (0x3404D9BC8865066DB4B85CC7B2630B64)
Complete name : O:\Gemini Man.mkv
Format : Matroska
Format version : Version 2
File size : 70.8 GiB
Duration : 1 h 57 min
Overall bit rate mode : Variable
Overall bit rate : 86.5 Mb/s
Movie name : Gemini Man
Encoded date : UTC 2020-02-28 01:11:42
Writing application : MakeMKV v1.14.7 win(x64-release)
Writing library : libmakemkv v1.14.7 (1.3.5/1.4.7) win(x64-release)
Video
ID : 1
ID in the original source medium : 4113 (0x1011)
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.1@High
HDR format : SMPTE ST 2086, HDR10 compatible
Codec ID : V_MPEGH/ISO/HEVC
Duration : 1 h 57 min
Bit rate : 81.0 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 59.940 (60000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.163
Stream size : 66.2 GiB (94%)
Language : English
Default : No
Forced : No
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : PQ
Matrix coefficients : BT.2020 non-constant
Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0010 cd/m2, max: 1000 cd/m2
Maximum Content Light Level : 5180 cd/m2
Maximum Frame-Average Light Level : 1577 cd/m2
Original source medium : Blu-ray
Audio #1
ID : 2
ID in the original source medium : 4352 (0x1100)
Format : MLP FBA 16-ch
Format/Info : Meridian Lossless Packing FBA with 16-channel presentation
Commercial name : Dolby TrueHD with Dolby Atmos
Codec ID : A_TRUEHD
Duration : 1 h 57 min
Bit rate mode : Variable
Bit rate : 4 204 kb/s
Maximum bit rate : 7 944 kb/s
Channel(s) : 8 channels
Channel layout : L R C LFE Ls Rs Lb Rb
Sampling rate : 48.0 kHz
Frame rate : 1 200.000 FPS (40 SPF)
Bit depth : 24 bits
Compression mode : Lossless
Stream size : 3.44 GiB (5%)
Title : Surround 7.1
Language : English
Default : Yes
Forced : No
Original source medium : Blu-ray
Number of dynamic objects : 11
Bed channel count : 1 channel
Bed channel configuration : LFE
Audio #2
ID : 3
ID in the original source medium : 4352 (0x1100)
Format : AC-3
Format/Info : Audio Coding 3
Commercial name : Dolby Digital
Format settings : Dolby Surround EX
Codec ID : A_AC3
Duration : 1 h 57 min
Bit rate mode : Constant
Bit rate : 640 kb/s
Channel(s) : 6 channels
Channel layout : L R C LFE Ls Rs
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 SPF)
Compression mode : Lossy
Stream size : 536 MiB (1%)
Title : Surround 5.1
Language : English
Service kind : Complete Main
Default : No
Forced : No
Original source medium : Blu-ray
Audio #3
ID : 4
ID in the original source medium : 4353 (0x1101)
Format : AC-3
Format/Info : Audio Coding 3
Commercial name : Dolby Digital
Codec ID : A_AC3
Duration : 1 h 57 min
Bit rate mode : Constant
Bit rate : 640 kb/s
Channel(s) : 6 channels
Channel layout : L R C LFE Ls Rs
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 SPF)
Compression mode : Lossy
Stream size : 536 MiB (1%)
Title : Surround 5.1
Language : English
Service kind : Complete Main
Default : No
Forced : No
Original source medium : Blu-ray
Text #1
ID : 5
ID in the original source medium : 4768 (0x12A0)
Format : PGS
Codec ID : S_HDMV/PGS
Codec ID/Info : Picture based subtitle format used on BDs/HD-DVDs
Duration : 1 h 45 min
Bit rate : 34.6 kb/s
Count of elements : 2642
Stream size : 26.1 MiB (0%)
Language : English
Default : Yes
Forced : No
Original source medium : Blu-ray
Text #2
ID : 7
ID in the original source medium : 4769 (0x12A1)
Format : PGS
Codec ID : S_HDMV/PGS
Codec ID/Info : Picture based subtitle format used on BDs/HD-DVDs
Duration : 1 h 45 min
Bit rate : 39.9 kb/s
Count of elements : 3080
Stream size : 30.2 MiB (0%)
Language : English
Default : No
Forced : No
Original source medium : Blu-ray
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Try the staging repository, if you can.
To test this update:
- Login via the command line
- Run the following command to add the staging repository:
echo 'deb http://apt.osmc.tv buster-devel main' | sudo tee /etc/apt/sources.list.d/osmc-devel.list - Run the following commands to update:
sudo apt-get update && sudo apt-get dist-upgrade && reboot - Your system should have have received the update.
Please see if the issue is resolved.
I also recommend you remove /etc/apt/sources.list.d/osmc-devel.list after updating.
I’d also recommend you deactivate the staging repository. You can do so with the following command:
sudo rm /etc/apt/sources.list.d/osmc-devel.list.
Please note that we will automatically disable this update channel after 14 days on your device in case you forget to do so to ensure that your system reverts to the stable update channel.
I’m hesitant to install it on this Vero because everything else is working so well. But I have another Vero4k+ that still has 18.9 on it. Can I use the same commands to install the staging repo version on it?
That will update you from v18.9 to v19.3, which may cause issues for you. The v18.9 shouldn’t have an issue that needs fixing – my understanding was that the problem was introduced recently for you.
Sam