Android build crash in MediaPipePremium license parsing — UE 5.6 and 5.7

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Discussed in #269

^{Originally posted by bumsuec September 10, 2026}
Hi,

I'm encountering a reproducible Android startup crash in MediaPipe4U Premium. I reproduced the same issue with both UE 5.6 and UE 5.7.

The project packages and installs successfully. On launch, MediaPipePremium finds the license file correctly:

LogMediaPipePremium: Android assert cached:
/storage/emulated/0/Android/data/com.YourCompany.churi_main/files/mediapipe4u/mediapipe4u.license

LogMediaPipePremium: Check license:
/storage/emulated/0/Android/data/com.YourCompany.churi_main/files/mediapipe4u/mediapipe4u.license

Immediately afterward, Unreal crashes:

Fatal error: [MallocBinnedCommon.cpp] [Line: 635]
FMallocBinnedCommon attempted to GetAllocationSizeExternal
on an unrecognized pointer

I symbolicated the UE 5.7 Android crash using the packaged symbols. The relevant stack is:

FMallocBinnedCommonBase::UnrecognizedPointerFatalError(void*)
TMallocBinnedCommon<FMallocBinned3,...>::GetAllocationSizeExternal(...)
FMallocPoisonProxy::Free(void*)

std::__ndk1::basic_string<...>::__is_long() const
string:1773

FLicenseInfo::ParseFromFile(FString const&)
MediaPipePremium/Private/License/LicenseInfo.cpp:145

FMediaPipePremiumModule::LoadLicense()
MediaPipePremium/Private/MediaPipePremium.cpp:126

FModuleManager::LoadModuleWithFailureReason(...)
FModuleManager::GetOrLoadModule(...)
FModuleManager::LoadModuleChecked(...)

UMediaPipePluginSettings::RefreshLicenseInfo()
MediaPipePluginSettings.cpp:26

UMediaPipePluginSettings::UMediaPipePluginSettings()
MediaPipePluginSettings.cpp:15

Environment:

Unreal Engine: 5.7
Android NDK: 27.2.12479018 (r27c)
Architecture: arm64-v8a
Device OS: Android 13
MediaPipe4U: current UE 5.7 package

The debug symbols for the supplied Premium binary also show it was built against NDK 27.2.12479018.

I also verified that the license copied to the device is byte-for-byte identical to the source license (same SHA-256), so this does not appear to be a corrupted/missing license file.

The Premium package only provides Public/License/LicenseInfo.h; Private/License/LicenseInfo.cpp is not included, so I cannot inspect or patch line 145 locally.

Could you please check FLicenseInfo::ParseFromFile() around LicenseInfo.cpp:145, particularly the std::string lifetime/deallocation there? The stack appears to show a std::string operation reaching FMallocPoisonProxy::Free() with a pointer Unreal does not recognize.

I can provide the full logcat and additional symbolicated addresses if needed.

Thank you.

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Hi,

Thank you for the detailed report and symbolicated stack trace.

Based on my investigation, this appears more likely to be related to the Android NDK build of our newly added video player library than to Unreal Engine itself. The library could cause the allocation/deallocation mismatch seen in your log.

I’ve rebuilt the Android video player library. Please extract the archive below and replace this file in your project:

Plugins\MediaPipe4U\MediaPipe4U\Source\ThirdParty\videoplayer\lib\Android\arm64-v8a\libvideoplayer.so

Then rebuild and repackage your Android project.

Please let me know if the crash persists. If the video player library turns out not to be the cause, I’ll continue investigating the Premium license-loading path.

Thank you for your help tracking this down.

libvideoplayer.zip

@bumsuec