[Bug 59949] New: wmvcore fails to allocate sample buffer (E_OUTOFMEMORY) in WOW64 mode, causing video playback to stop after a few seconds

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59949

            Bug ID: 59949
           Summary: wmvcore fails to allocate sample buffer
                    (E_OUTOFMEMORY) in WOW64 mode, causing video playback
                    to stop after a few seconds
           Product: Wine
           Version: 9.0
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: quartz
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 81323
  --> http://bugs.winehq.org/attachment.cgi?id=81323
Full Log File

Summary:
When running 32-bit games with PROTON_USE_WOW64=1, video playback 
stops after a few seconds. The demuxer reads and decodes frames 
correctly, but then wmvcore fails to allocate a buffer for the 
next sample with E_OUTOFMEMORY (0x8007000e), after which 
demuxer_destroy fails with Access Violation (0xc0000005).

Environment:
- OS: CachyOS (Arch-based Linux)
- GPU: NVIDIA GeForce RTX 5060, driver 610.43.2
- Proton version: GE-Proton 11-1
- Wine mode: WOW64 (PROTON_USE_WOW64=1)
- Game: Resident Evil Revelations 2 (Steam App ID: 287290)
- Game type: 32-bit DirectX 9, MT Framework engine

Steps to reproduce:
1. Set launch options:
   PROTON_USE_WOW64=1 WINEDEBUG=+quartz PROTON_LOG=1
2. Launch Resident Evil Revelations 2
3. Start campaign mode
4. Wait for any cutscene to begin playback
5. Video plays for ~2 seconds then goes black (audio continues)

Expected behavior:
Video plays completely without interruption.

Actual behavior:
Video stops after a few seconds. Log shows the following sequence:

  05cc:warn:quartz:winedmo_demuxer_read Reached end of media file 
  on demuxer 0x7f99f47ecc40.
  05cc:warn:quartz:winedmo_transform_drain Draining transform.
  05c8:err:wmvcore:wm_reader_read_stream_sample Failed to allocate 
  sample of 1382400 bytes, hr 0x8007000e.
  05c8:warn:quartz:winedmo_demuxer_destroy demuxer_destroy failed, 
  status 0xc0000005

Root cause analysis:
wmvcore fails to allocate ~1.4MB buffer for an uncompressed video 
frame (1382400 bytes = 1280x720 RGBA frame) with E_OUTOFMEMORY. 
This only happens in WOW64 mode — without PROTON_USE_WOW64=1 video 
works but the game crashes due to a separate WOW64 assertion failure 
in the main process (also a WOW64-related issue in 32-bit games on 
RTX 50xx GPUs).

Without WOW64 mode crash log shows:
  Unhandled exception: assertion failed in wow64 32-bit code (0xf7fd522c)
  warn:virtual:virtual_setup_exception exception outside of stack limits

Additional notes:
- PROTON_NVIDIA_LIBS_NO_32BIT=1 extends memory before crash from 
  ~2GB to ~3GB but breaks video entirely
- wmvcore=b,n override does not fix the issue
- Problem is reproducible consistently

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[Bug 59949] wmvcore fails to allocate sample buffer (E_OUTOFMEMORY) in WOW64 mode, causing video playback to stop after a few seconds

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59949

Ken Sharp <[e-mail]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEEDINFO
          Component|quartz                      |-unknown
     Ever confirmed|0                           |1

--- Comment #1 from Ken Sharp <[e-mail]> ---
This is Wine bugzilla, not Proton bugzilla.

Try again in vanilla Wine 11.12 and DO NOT USE AI.
https://gitlab.winehq.org/wine/wine/-/wikis/Bugs

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