[wiad]

Same problem for me ever since upgrading to 17. Video files play perfectly well on their own, but played from a picture slideshow there is severe video stutter/freeze. Audio is fine.

I am now on 17.5 on Android.

There was a thread suggesting a plausible cause to this problem:
https://forum.kodi.tv/showthread.php?tid=307785

Has it been confirmed/denied that video playback in slideshows does not use acceleration?