HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

Could you please tell me how to make videos work in a mod? For example, when a video is supposed to play, instead of the executioner video, a black screen appears, and the music plays. The black screen remains until the music finishes. The same thing happens with campaign videos – a black screen appears, and only the text is displayed.