v18 Stutter when playing 23.976 material on Intel NUC8i3BEK
#1
Video 
Problem: When playing back video material encoded in x264 (haven't tested any other), container mkv or mp4 etc. doesn't matter, with 23.976fps and having activated the sync monitor to video option, I get a very short  "jerk" every 4 seconds or so. When I deactivate that option, or playing material with other framerates, everything seems normal (of course 23.976 video doesn't look optimal when that option is deactivated, but at least I don't notice the regular stutter). I use VAAPI but deactivating it doesn't change the behavior.  I have my NUC connected to an A/V receiver via HDMI, having it connected directly to my TV also doesn't change anything. I updated the NUC's BIOS to the latest version 0077 from November 27th of this year, no change. There exists a HDMI Firmware Update Tool from Intel which only runs on windows. Since I don't have that installed I'm out of luck here, but I'm not convinced it might change anything because I think the problem is elsewhere see my musings below.

My setup:
  • Intel NUC8i3BEK, which is:
  • Intel Core i3-8109U @ 3.00GHz
  • 8GB RAM
  • Intel HD Graphics GPU (Coffeelake 3x8 GT3), according to kodi info using Mesa 19.0.8 driver
  • Running Kodi v18.5
  • on (L)ubuntu 19.04 Linux 5.0.0-37-generic x86_64

Suggestion:
After creating the kodi debug log I notice the following section which concerns the start of playback:

2019-12-26 17:47:17.506 T:139740522085056   DEBUG: ------ Window Init (VideoFullScreen.xml) ------
2019-12-26 17:47:17.506 T:139740522085056    INFO: Loading skin file: VideoFullScreen.xml, load type: KEEP_IN_MEMORY
2019-12-26 17:47:17.510 T:139740522085056  NOTICE: Whitelist search for: width: 720, height: 544, fps: 23.976, 3D: false
2019-12-26 17:47:17.510 T:139740522085056   DEBUG: Trying to find exact refresh rate
2019-12-26 17:47:17.511 T:139740522085056   DEBUG: No exact whitelisted resolution matched, trying double refresh rate
2019-12-26 17:47:17.511 T:139740522085056   DEBUG: No double whitelisted resolution matched, trying 3:2 pullback
2019-12-26 17:47:17.511 T:139740522085056   DEBUG: No 3:2 pullback refresh rate whitelisted resolution matched, trying current resolution
2019-12-26 17:47:17.511 T:139740522085056   DEBUG: Matched current Resolution DP-1: 1920x1080 @ 23.98Hz (21)
2019-12-26 17:47:17.511 T:139740522085056  NOTICE: Display resolution ADJUST : DP-1: 1920x1080 @ 23.98Hz (21) (weight: 423625307979776.000)

So kodi chooses 23.98, which is not exactly 23.976, maybe that's what's causing the hiccups? I remember way back in the early days of kodi and of course with another hardware setup, having to edit some X config file to add a line to get real 23.976 output to my TV but I forgot what and where, maybe that would help?

debug.log: yirovecobi.kodi (paste)
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Stutter when playing 23.976 material on Intel NUC8i3BEK - by gokudo - 2019-12-26, 19:02


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