Thanks for all your feedback! My first thoughts were the same, that the sample was corrupt. However, it plays just fine on my computer both in VLC and in Kodi. Finding another source without being reencoded will be difficult I’m afraid. I have another sample from another movie that shows similar behaviour, although not as extreme. I uploaded it here:
At 20 sec. there is a slight slowing/delay in the video. As with the other sample this plays fine in the 12/06 build and on my computer.