Refresh rate issue

  • I've just upgraded to Libreelec 8.9/Kodi 18 and Kodi seems to have suddenly lost the ability to determine the frame rate of the videos I'm playing. Adjust Display Refresh Rate is set to On Start/Stop and Sync Playback to Display is set to off, which is the way I've always had it set. Kodi's refresh rate is set to 60Hz and Kodi has always been able to set my TV's refresh rate to match the video frame rate. However, I suddenly noticed jerkiness in the playback of most videos and the TV is reporting it is always at 60Hz. When I manually set Kodi's refresh rate to match the video, Kodi sets the TV's refresh rate properly and video playback is smooth. Any idea what's going on? Thanks

  • As my crystal ball is currently in for it's 10,000 numpty service, I'm unable to determine your H/W and as you haven't included a log, I have no idea how to reply.

  • Over time we've seen an increase in TV screens which are capable of displaying things the HTPC device can't handle, but all Kodi sees is the list of resolutions from EDID on the HDMI connection, so it's become necessary to provide some better controls for how Kodi handles resolutions and refresh rates. Settings > System > Video > Whitelist; contains the whitelist of resolutions and refresh rates you need. If there are no entries Kodi will remain on ~1080p60 which is the default.

  • Hardware is an ASUS Chromebox CN60 Model M075U, Intel Core i3 4010U / 1.7 GHz, 4GB 1600 MHz DDR3 SDRAM, 16 GB M.2 SSD, two 1TB 2.5 inch mechanical HD attached to USB ports, standalone installation of Libreelec. Movie files are stored on the USB drives and an another Windows PC connected via network. I get an error trying to upload the log file from my Windows 10 desktop. Still working on that.

  • OK, so I'm still baffled by what's going on. I have the Whitelist set for the TV's refresh rates, Adjust Display Refresh Rate is set to On Start/Stop, Sync Playback to Display is set to Off, Hardware Acceleration is disabled, Audio offset is -0.05s.The Kodi player is matching the TV refresh rate to the video fps as it should. Videos are playing smoothly at 23.98 fps, but videos with 29.97 fps frame rate are still jerky, even though the TV is verifiably set to 29.97Hz. However, here is the more baffling thing: if I force 23.98Hz resolution, then the 29.97 fps videos play absolutely smoothly, with Sync Playback to Display still set to Off (and I have a VERY critical eye - there is no judder at all). I don't get what's going on. So now I just leave everything set to a forced resolution of 23.98Hz, which is great for movies, but not so great for the interface. Log file is available at https://drive.google.com/file/d/1ggkw_1v_4wdgu-73u-i2ti5gc76p70rh/view?usp=sharing; hardware details above. Thanks for any help

  • videos with 29.97 fps frame rate are still jerky, even though the TV is verifiably set to 29.97Hz.

    The 29.97 and 30Hz modes should not normally be used. Just leave 60, 59.94, 24 and 23.98Hz modes in the whitelist and remove 29.97/30Hz modes.


    if I force 23.98Hz resolution, then the 29.97 fps videos play absolutely smoothly, with Sync Playback to Display still set to Off (and I have a VERY critical eye - there is no judder at all). I don't get what's going on

    Is it a footage that was originally shot on film at 24 fps? My guess is that Inverse Telecine is going on. If it is a DVD with a so-called "soft-telecine" encode (a 24p encode with pulldown flags) - Kodi probably just ignores the pulldown flags when the HDMI output is forced to 23.98Hz. That's why you get a smooth playback.

    Edited 8 times, last by smp ().

  • I've removed the 29.97 and 30Hz modes from the whitelist, but now my 29.97 fps videos look really, really bad at 60Hz, as if half the frames are being dropped. All the other settings are unchanged. I don't know what the original source frame rate was for this video. Has something been changed with the Leia upgrade? This was all working fine in Krypton.

  • Hello,


    Just asking in case of - has your issue been fixed ?


    I have similar problems here, even if I'm not using LibreElec...


    I use Kodi v18 under Osx, and when I use the Netflix plugin the videos at 24fps are perfectly fluid and the videos at 23,976fps or 25fps are stuttering a bit... very strange.


    Thanks !

  • ok...

    well ì tried with RC4 with no success...


    my problem must be something else !!


    Thanks for the answer :)

  • Im having huge problems with videos at 50 vor 60hz too. The audio video sync is so awfull you can not watch them. Videos are played too slow thats what it looks like.


    Its the case with the first Beta that came out. With the last alpha version it was fine.


    Im on a Nuc c8 i3.


    Edit:

    When im enabling syncing in Start/stop my 60hz files are working but the picture itself is slipping out of the corners, even in the menu. Im watching in an LG C8 OLED TV.

  • Hello,


    OK so I'm not the only one...


    What versions are you talking about ?

    The Leia RC5.2 ?


    EDIT-

    Ok I think it's not the same problem as it was resolved by enabling sync...


    If the interface is too big you can configure that in the setup menu "video calibration"

  • yes i could configure it manually but for now i was quite happy with it as it was.


    Its at 0,0 0,0 and 1,000 and the image was just as big as it should be.


    The thing is that the menu and everything matches again when i stop the playback. But when a video is running its far too big. Ive got the feeling that its even worse with the Beta 3 which i have installed today.


    Can somebody confirm this?


    Deactivated sync still leads to "stucking".

  • Anyone who has an idea about it?


    Im loosing about 3cm on every edge when the syncing is enabled. The problem is that i dont know exactly how to calibrate the screen without loosing space.