Vpeter, I’m not sure I understand. For your part, the chapter thumbnails work perfectly from the network, on Windows but also on CoreElec?
I only tested local files - don’t have any network equipment to test with.
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For what it’s worth, chapter thumbnails don’t work on CE over the network, unlike on Windows.
Tested with nfs and samba.
@Bindou Did you take a debug log?
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Thank you very much Kaan. This therefore confirms my observations. We therefore have an overview which allows us to be sure that the problem is inherent to CoreElec, more precisely to its management of network reading. Yes, my first post actually contains the CE and Android log.
But I can see thumbs on my setup with smb so that’s not always the case
It actually varies depending on the film. I can’t figure out what makes it work or not. I tried with other chapters that I redid myself, and the behavior is identical. Maybe it’s a coincidence, but for me, chapter thumbnails only work on my h264 videos. And never on my h265 videos.
@Vasco
Have you tried my sample?
works here normal (VideoPlayer::OpenFile: smb://192.168.2.248/tst/Star Trek- The Next Generation S05E21 - The Perfect Mate-001.mkv)
Forget about the background, it’s from another video played before.
But chapter have thumbnails and select them does work to.
Where it does not work is like from ISO files, not local and not from remote source.
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Yes, this extract from Star Trek works perfectly on all platforms.
That sample was also h265.
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Is there a difference between CE and Kodi in the way of handling playback from the network that could cause this bug ?
Today, the thumbnails/chapters worked for hours, I tried dozens of films, everything worked perfectly, with a lot of responsiveness. A miracle !
But restarting CE this evening, the problem returned as before. 
What a desappointment.
It’s very strange.
And this time, it works perfectly since the last update this morning. 
Let’s hope it lasts !
What changes have been made that could impact the playback of thumbnails of network video files ?
Nothing related as seen on CoreELEC nightly builds
Changelog (20240717)
- 96f633f605: Tue Jul 16 10:33:22 2024 +0200 – busybox: extend motd with device info like ‘Machine model’, ‘CoreELEC dt-id’, … (Peter)
- 199c430ff6: Tue Jul 16 10:31:53 2024 +0200 – systemd: show motd in debug shell (Peter)
- 30b3a8c087: Tue Jul 16 10:30:08 2024 +0200 – Revert “openssh: extend motd with device info: ‘Machine model’, ‘CoreELEC dt-id’ and ‘Amlogic dt-id’” (Peter)
Extremely strange! There it still works. I’m going to let tomorrow pass before definitively confirming.
It still works, even after today’s update. I think one of this week’s updates fixed this bug, but what ? Maybe there was an update to the video player ? In any case, this is excellent news. Hopefully it never comes back.
In the meantime, I am very happy with this new progress. There are finally only 2 small bugs left on Core Elec, notably the image tearing caused by the 4k definition of the interface. We are just one step away from perfection. 
Thanks again to everyone who works on CE. The quality of the work carried out is exceptional.