Last I saw on this topic, someone said the videos in Stone Prophet were almost completely fixed, but the ending video was still freezing. I last tried playing Stone Prophet about three years ago and was very unhappy about the video problems. I'd like to start up a new game now, but if I still can't see the ending, I don't think I want to bother.

Does anyone know if the ending is fixed?

I can confirm that it's fixed. (Loaded a save to be 100% sure.)
The missing videos problem has also been fixed.

I reached the end of the game, but each time during the video, when the boy is about to speak, the game freezes. What can be done about this?

UPDATE:
I downloaded the corrected Code 2 from a link in a different post on this board and the ending video works now:

https://www.gog.com/forum/dungeons_dragons_ravenloft_series/this_is_why_videos_do_not_play_and_the_game_crashes_at_the_end

The ending works fine now. Sadly the animation of the Hierophant and Ankthepot fighting still doesn't play.

That's funny. I thought I saw all the animations of that battle. (There were four.)

Oh man, GOG was supposed to have fixed all of this, thanks to exo. I even had contact with GOG support about it.
I guess my game version is all patched up by myself, hence it worked for me. Big oops.

*gives up*

After I lured Ankthepot to the Hierophant the screen just shakes, when the fighting animations are are supposed to show. The ending works, though.

you can always just play our copy. it even has general midi support and direct character transfer support from Strahd's Possession.

If only the commercial copy were as good.