PETKA: Audio desync in cutscenes

[Tkachov]

I've noticed that in the first cutscene of Red Comrades 2, but I think this might happen in other cutscenes and in first game as well.

Video demonstration: ​https://youtu.be/hK0OmmjceT8 (first 50 seconds are in the original game, the rest is in ScummVM). The most noticable moments are when the glass shutters (0:25 vs 1:15) and when three metal pieces appear when hero's falling from the sky (0:36 vs 1:26).

You can also see a "lag" between switching screens in this cutscene, which seems to be not there in the original game. I'm not sure, but could that be the reason of the delayed audio?

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ScummVM 2.3.0git11899-g3fb4d67b4e (Jan 16 2021 05:21:57)
Windows 10 version 20H2 64-bit
Red Comrades 2 (petka2)

To reproduce:

• start the game;
• <in the first cutscene (after heroes talk in their hut) you could see how animations happen before corresponding audio>.

[Tkachov]

If you unpack .str archives into the game folder, the screen loads as fast as in the original game, and there is no audio desync in this cutscene.

I actually think the original game might've been unpacking its archives to some temp directory and loading those files instead of extracting each file from .str when needed.

[whiterandrek]

The engine doesn’t unpack archives, but I know that ScummVM loads entire wav in memory, but I don’t think this is a problem.

I probably know where the problem is