[BUG]: Regression - Guilty Gear XX ACPR - Freeze at the logo

[Immersion95]

Describe the Bug

The game freezes at the Arc System Works logo before the opening starts.

It does that in SW/HW since v1.7.2838

Reproduction Steps

Start the game

Expected Behavior

Opening should starts

PCSX2 Revision

v1.7.2847

Operating System

Windows 11

If Linux - Specify Distro

No response

CPU

Ryzen 5600x

GPU

AMD 6800

GS Settings

No response

Emulation Settings

No response

GS Window Screenshots

Logs & Dumps

snaps.zip

[refractionpcsx2]

Can you create a blockdump of the game using v1.7.2837 or older to get past the hang (doesn't have to be too far past), then upload that? Then it can be looked at.

Maybe @Goatman13 might be interested in looking at it.

[Immersion95]

Can you create a blockdump of the game using v1.7.2837 or older to get past the hang (doesn't have to be too far past), then upload that? Then it can be looked at.

Maybe @Goatman13 might be interested in looking at it.

Of course, here it is :

Guilty Gear XX Accent Core Plus (Japan) (2022-05-31 10-21-11).zip

[refractionpcsx2]

Thanks

[Goatman13]

Game work fine when there is more than 32 bits available here:

pcsx2/pcsx2/IPU/mpeg2lib/Mpeg.cpp

Line 1226 in 0b2536d

if (!g_BP.FillBuffer(24))

Literally ensuring that buffer have at least 33 bits is enough for stream to play correctly.
I didn't fully figured out why, and i can't do much before weekend. Game spams tens of 00 between startcodes, so probably something get lost when there is less than 33 bits available and game start skipping 0 bytes. I don't know how this worked before v1.7.2838.

[refractionpcsx2]

oh hmm, you might need to split the function up, if it has to exit out in order to wait for a DMA or something, it's going to get out of sorts of where it needs to return in that loop, so it may need a ipu_cmd.pos[1] setting up for that case.

[refractionpcsx2]

This should be fixed with #6313

Looks like it was a DMA/Command timing problem