diff --git a/docs/Recording file format.md b/docs/Recording file format.md
index 6ee8b37..8fb17ea 100644
--- a/docs/Recording file format.md	
+++ b/docs/Recording file format.md	
@@ -209,6 +209,22 @@ No parameters.
 - allocation : pointer
 - newSize : uint64
 
+**vmaDefragmentationBegin** (min format version: 1.5)
+
+- defragmentationInfo2.flags : uint32
+- defragmentationInfo2.pAllocations : list of pointers
+- defragmentationInfo2.pPools : list of pointers
+- defragmentationInfo2.maxCpuBytesToMove : uint64
+- defragmentationInfo2.maxCpuAllocationsToMove : uint32
+- defragmentationInfo2.maxGpuBytesToMove : uint64
+- defragmentationInfo2.maxGpuAllocationsToMove : uint32
+- defragmentationInfo2.commandBuffer : pointer
+- context (output) : pointer
+
+**vmaDefragmentationEnd** (min format version: 1.5)
+
+- context : pointer
+
 # Data types
 
 **bool**
diff --git a/src/VmaReplay/VmaReplay.cpp b/src/VmaReplay/VmaReplay.cpp
index 6b3615d..d555b2d 100644
--- a/src/VmaReplay/VmaReplay.cpp
+++ b/src/VmaReplay/VmaReplay.cpp
@@ -85,6 +85,8 @@ enum class VMA_FUNCTION
     GetAllocationInfo,
     MakePoolAllocationsLost,
     ResizeAllocation,
+    DefragmentationBegin,
+    DefragmentationEnd,
     Count
 };
 static const char* VMA_FUNCTION_NAMES[] = {
@@ -108,6 +110,8 @@ static const char* VMA_FUNCTION_NAMES[] = {
     "vmaGetAllocationInfo",
     "vmaMakePoolAllocationsLost",
     "vmaResizeAllocation",
+    "vmaDefragmentationBegin",
+    "vmaDefragmentationEnd",
 };
 static_assert(
     _countof(VMA_FUNCTION_NAMES) == (size_t)VMA_FUNCTION::Count,
@@ -839,7 +843,7 @@ void ConfigurationParser::CompareMemProps(
 
 static const char* const VALIDATION_LAYER_NAME = "VK_LAYER_LUNARG_standard_validation";
 
-static bool g_MemoryAliasingWarningEnabled = true;
+static const bool g_MemoryAliasingWarningEnabled = false;
 
 static VKAPI_ATTR VkBool32 VKAPI_CALL MyDebugReportCallback(
     VkDebugReportFlagsEXT flags,
@@ -973,6 +977,7 @@ private:
     };
     std::unordered_map<uint64_t, Pool> m_Pools;
     std::unordered_map<uint64_t, Allocation> m_Allocations;
+    std::unordered_map<uint64_t, VmaDefragmentationContext> m_DefragmentationContexts;
 
     struct Thread
     {
@@ -1029,6 +1034,8 @@ private:
     void ExecuteGetAllocationInfo(size_t lineNumber, const CsvSplit& csvSplit);
     void ExecuteMakePoolAllocationsLost(size_t lineNumber, const CsvSplit& csvSplit);
     void ExecuteResizeAllocation(size_t lineNumber, const CsvSplit& csvSplit);
+    void ExecuteDefragmentationBegin(size_t lineNumber, const CsvSplit& csvSplit);
+    void ExecuteDefragmentationEnd(size_t lineNumber, const CsvSplit& csvSplit);
 
     void DestroyAllocation(size_t lineNumber, const CsvSplit& csvSplit, const char* functionName);
 
@@ -1175,6 +1182,10 @@ void Player::ExecuteLine(size_t lineNumber, const StrRange& line)
             ExecuteMakePoolAllocationsLost(lineNumber, csvSplit);
         else if(StrRangeEq(functionName, VMA_FUNCTION_NAMES[(uint32_t)VMA_FUNCTION::ResizeAllocation]))
             ExecuteResizeAllocation(lineNumber, csvSplit);
+        else if(StrRangeEq(functionName, VMA_FUNCTION_NAMES[(uint32_t)VMA_FUNCTION::DefragmentationBegin]))
+            ExecuteDefragmentationBegin(lineNumber, csvSplit);
+        else if(StrRangeEq(functionName, VMA_FUNCTION_NAMES[(uint32_t)VMA_FUNCTION::DefragmentationEnd]))
+            ExecuteDefragmentationEnd(lineNumber, csvSplit);
         else
         {
             if(IssueWarning())
@@ -1611,6 +1622,21 @@ int Player::InitVulkan()
 
 void Player::FinalizeVulkan()
 {
+    if(!m_DefragmentationContexts.empty())
+    {
+        printf("WARNING: Defragmentation contexts not destroyed: %zu.\n", m_DefragmentationContexts.size());
+
+        if(CLEANUP_LEAKED_OBJECTS)
+        {
+            for(const auto& it : m_DefragmentationContexts)
+            {
+                vmaDefragmentationEnd(m_Allocator, it.second);
+            }
+        }
+
+        m_DefragmentationContexts.clear();
+    }
+
     if(!m_Allocations.empty())
     {
         printf("WARNING: Allocations not destroyed: %zu.\n", m_Allocations.size());
@@ -1744,8 +1770,6 @@ void Player::Defragment()
         return;
     }
 
-    g_MemoryAliasingWarningEnabled = false;
-
     const time_point timeBeg = std::chrono::high_resolution_clock::now();
 
     VmaDefragmentationInfo2 defragInfo = {};
@@ -1835,8 +1859,6 @@ void Player::Defragment()
     }
 
     vkResetCommandPool(m_Device, m_CommandPool, 0);
-
-    g_MemoryAliasingWarningEnabled = true;
 }
 
 void Player::PrintStats()
@@ -2894,6 +2916,198 @@ void Player::ExecuteResizeAllocation(size_t lineNumber, const CsvSplit& csvSplit
     }
 }
 
+void Player::ExecuteDefragmentationBegin(size_t lineNumber, const CsvSplit& csvSplit)
+{
+    m_Stats.RegisterFunctionCall(VMA_FUNCTION::DefragmentationBegin);
+
+    if(ValidateFunctionParameterCount(lineNumber, csvSplit, 9, false))
+    {
+        VmaDefragmentationInfo2 defragInfo = {};
+        std::vector<uint64_t> allocationOrigPtrs;
+        std::vector<uint64_t> poolOrigPtrs;
+        uint64_t cmdBufOrigPtr = 0;
+        uint64_t defragCtxOrigPtr = 0;
+
+        if(StrRangeToUint(csvSplit.GetRange(FIRST_PARAM_INDEX), defragInfo.flags) &&
+            StrRangeToPtrList(csvSplit.GetRange(FIRST_PARAM_INDEX + 1), allocationOrigPtrs) &&
+            StrRangeToPtrList(csvSplit.GetRange(FIRST_PARAM_INDEX + 2), poolOrigPtrs) &&
+            StrRangeToUint(csvSplit.GetRange(FIRST_PARAM_INDEX + 3), defragInfo.maxCpuBytesToMove) &&
+            StrRangeToUint(csvSplit.GetRange(FIRST_PARAM_INDEX + 4), defragInfo.maxCpuAllocationsToMove) &&
+            StrRangeToUint(csvSplit.GetRange(FIRST_PARAM_INDEX + 5), defragInfo.maxGpuBytesToMove) &&
+            StrRangeToUint(csvSplit.GetRange(FIRST_PARAM_INDEX + 6), defragInfo.maxGpuAllocationsToMove) &&
+            StrRangeToPtr(csvSplit.GetRange(FIRST_PARAM_INDEX + 7), cmdBufOrigPtr) &&
+            StrRangeToPtr(csvSplit.GetRange(FIRST_PARAM_INDEX + 8), defragCtxOrigPtr))
+        {
+            const size_t allocationOrigPtrCount = allocationOrigPtrs.size();
+            std::vector<VmaAllocation> allocations;
+            allocations.reserve(allocationOrigPtrCount);
+            for(size_t i = 0; i < allocationOrigPtrCount; ++i)
+            {
+                const auto it = m_Allocations.find(allocationOrigPtrs[i]);
+                if(it != m_Allocations.end() && it->second.allocation)
+                {
+                    allocations.push_back(it->second.allocation);
+                }
+            }
+            if(!allocations.empty())
+            {
+                defragInfo.allocationCount = (uint32_t)allocations.size();
+                defragInfo.pAllocations = allocations.data();
+            }
+
+            const size_t poolOrigPtrCount = poolOrigPtrs.size();
+            std::vector<VmaPool> pools;
+            pools.reserve(poolOrigPtrCount);
+            for(size_t i = 0; i < poolOrigPtrCount; ++i)
+            {
+                const auto it = m_Pools.find(poolOrigPtrs[i]);
+                if(it != m_Pools.end() && it->second.pool)
+                {
+                    pools.push_back(it->second.pool);
+                }
+            }
+            if(!pools.empty())
+            {
+                defragInfo.poolCount = (uint32_t)pools.size();
+                defragInfo.pPools = pools.data();
+            }
+
+            if(allocations.size() != allocationOrigPtrCount ||
+                pools.size() != poolOrigPtrCount)
+            {
+                if(IssueWarning())
+                {
+                    printf("Line %zu: Passing %zu allocations and %zu pools to vmaDefragmentationBegin, while originally %zu allocations and %zu pools were passed.\n",
+                        lineNumber,
+                        allocations.size(), pools.size(),
+                        allocationOrigPtrCount, poolOrigPtrCount);
+                }
+            }
+
+            if(cmdBufOrigPtr)
+            {
+                VkCommandBufferBeginInfo cmdBufBeginInfo = { VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO };
+                cmdBufBeginInfo.flags = VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT;
+                VkResult res = vkBeginCommandBuffer(m_CommandBuffer, &cmdBufBeginInfo);
+                if(res == VK_SUCCESS)
+                {
+                    defragInfo.commandBuffer = m_CommandBuffer;
+                }
+                else
+                {
+                    printf("Line %zu: vkBeginCommandBuffer failed (%d)\n", lineNumber, res);
+                }
+            }
+
+            VmaDefragmentationContext defragCtx = nullptr;
+            VkResult res = vmaDefragmentationBegin(m_Allocator, &defragInfo, nullptr, &defragCtx);
+
+            if(defragInfo.commandBuffer)
+            {
+                vkEndCommandBuffer(m_CommandBuffer);
+
+                VkSubmitInfo submitInfo = { VK_STRUCTURE_TYPE_SUBMIT_INFO };
+                submitInfo.commandBufferCount = 1;
+                submitInfo.pCommandBuffers = &m_CommandBuffer;
+                vkQueueSubmit(m_TransferQueue, 1, &submitInfo, VK_NULL_HANDLE);
+                vkQueueWaitIdle(m_TransferQueue);
+            }
+
+            if(res >= VK_SUCCESS)
+            {
+                if(defragCtx)
+                {
+                    if(defragCtxOrigPtr)
+                    {
+                        // We have defragmentation context, originally had defragmentation context: Store it.
+                        m_DefragmentationContexts[defragCtxOrigPtr] = defragCtx;
+                    }
+                    else
+                    {
+                        // We have defragmentation context, originally it was null: End immediately.
+                        vmaDefragmentationEnd(m_Allocator, defragCtx);
+                    }
+                }
+                else
+                {
+                    if(defragCtxOrigPtr)
+                    {
+                        // We have no defragmentation context, originally there was one: Store null.
+                        m_DefragmentationContexts[defragCtxOrigPtr] = nullptr;
+                    }
+                    else
+                    {
+                        // We have no defragmentation context, originally there wasn't as well - nothing to do.
+                    }
+                }
+            }
+            else
+            {
+                if(defragCtxOrigPtr)
+                {
+                    // Currently failed, originally succeeded.
+                    if(IssueWarning())
+                    {
+                        printf("Line %zu: vmaDefragmentationBegin failed (%d), while originally succeeded.\n", lineNumber, res);
+                    }
+                }
+                else
+                {
+                    // Currently failed, originally don't know.
+                    if(IssueWarning())
+                    {
+                        printf("Line %zu: vmaDefragmentationBegin failed (%d).\n", lineNumber, res);
+                    }
+                }
+            }
+        }
+        else
+        {
+            if(IssueWarning())
+            {
+                printf("Line %zu: Invalid parameters for vmaDefragmentationBegin.\n", lineNumber);
+            }
+        }
+    }
+}
+
+void Player::ExecuteDefragmentationEnd(size_t lineNumber, const CsvSplit& csvSplit)
+{
+    m_Stats.RegisterFunctionCall(VMA_FUNCTION::DefragmentationEnd);
+
+    if(ValidateFunctionParameterCount(lineNumber, csvSplit, 1, false))
+    {
+        uint64_t origPtr = 0;
+
+        if(StrRangeToPtr(csvSplit.GetRange(FIRST_PARAM_INDEX), origPtr))
+        {
+            if(origPtr != 0)
+            {
+                const auto it = m_DefragmentationContexts.find(origPtr);
+                if(it != m_DefragmentationContexts.end())
+                {
+                    vmaDefragmentationEnd(m_Allocator, it->second);
+                    m_DefragmentationContexts.erase(it);
+                }
+                else
+                {
+                    if(IssueWarning())
+                    {
+                        printf("Line %zu: Defragmentation context %llX not found.\n", lineNumber, origPtr);
+                    }
+                }
+            }
+        }
+        else
+        {
+            if(IssueWarning())
+            {
+                printf("Line %zu: Invalid parameters for vmaDefragmentationEnd.\n", lineNumber);
+            }
+        }
+    }
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Main functions
 
diff --git a/src/vk_mem_alloc.h b/src/vk_mem_alloc.h
index 5a69ef2..f4b6383 100644
--- a/src/vk_mem_alloc.h
+++ b/src/vk_mem_alloc.h
@@ -6370,6 +6370,11 @@ public:
         VmaAllocation allocation);
     void RecordMakePoolAllocationsLost(uint32_t frameIndex,
         VmaPool pool);
+    void RecordDefragmentationBegin(uint32_t frameIndex,
+        const VmaDefragmentationInfo2& info,
+        VmaDefragmentationContext ctx);
+    void RecordDefragmentationEnd(uint32_t frameIndex,
+        VmaDefragmentationContext ctx);
 
 private:
     struct CallParams
@@ -6397,7 +6402,21 @@ private:
     int64_t m_StartCounter;
 
     void GetBasicParams(CallParams& outParams);
-    void PrintPointerList(uint64_t count, const VmaAllocation* pItems);
+
+    // T must be a pointer type, e.g. VmaAllocation, VmaPool.
+    template<typename T>
+    void PrintPointerList(uint64_t count, const T* pItems)
+    {
+        if(count)
+        {
+            fprintf(m_File, "%p", pItems[0]);
+            for(uint64_t i = 1; i < count; ++i)
+            {
+                fprintf(m_File, " %p", pItems[i]);
+            }
+        }
+    }
+
     void Flush();
 };
 
@@ -13608,6 +13627,41 @@ void VmaRecorder::RecordMakePoolAllocationsLost(uint32_t frameIndex,
     Flush();
 }
 
+void VmaRecorder::RecordDefragmentationBegin(uint32_t frameIndex,
+    const VmaDefragmentationInfo2& info,
+    VmaDefragmentationContext ctx)
+{
+    CallParams callParams;
+    GetBasicParams(callParams);
+
+    VmaMutexLock lock(m_FileMutex, m_UseMutex);
+    fprintf(m_File, "%u,%.3f,%u,vmaDefragmentationBegin,%u,", callParams.threadId, callParams.time, frameIndex,
+        info.flags);
+    PrintPointerList(info.allocationCount, info.pAllocations);
+    fprintf(m_File, ",");
+    PrintPointerList(info.poolCount, info.pPools);
+    fprintf(m_File, ",%llu,%u,%llu,%u,%p,%p\n",
+        info.maxCpuBytesToMove,
+        info.maxCpuAllocationsToMove,
+        info.maxGpuBytesToMove,
+        info.maxGpuAllocationsToMove,
+        info.commandBuffer,
+        ctx);
+    Flush();
+}
+
+void VmaRecorder::RecordDefragmentationEnd(uint32_t frameIndex,
+    VmaDefragmentationContext ctx)
+{
+    CallParams callParams;
+    GetBasicParams(callParams);
+
+    VmaMutexLock lock(m_FileMutex, m_UseMutex);
+    fprintf(m_File, "%u,%.3f,%u,vmaDefragmentationEnd,%p\n", callParams.threadId, callParams.time, frameIndex,
+        ctx);
+    Flush();
+}
+
 VmaRecorder::UserDataString::UserDataString(VmaAllocationCreateFlags allocFlags, const void* pUserData)
 {
     if(pUserData != VMA_NULL)
@@ -13683,18 +13737,6 @@ void VmaRecorder::GetBasicParams(CallParams& outParams)
     outParams.time = (double)(counter.QuadPart - m_StartCounter) / (double)m_Freq;
 }
 
-void VmaRecorder::PrintPointerList(uint64_t count, const VmaAllocation* pItems)
-{
-    if(count)
-    {
-        fprintf(m_File, "%p", pItems[0]);
-        for(uint64_t i = 1; i < count; ++i)
-        {
-            fprintf(m_File, " %p", pItems[i]);
-        }
-    }
-}
-
 void VmaRecorder::Flush()
 {
     if((m_Flags & VMA_RECORD_FLUSH_AFTER_CALL_BIT) != 0)
@@ -15987,7 +16029,17 @@ VkResult vmaDefragmentationBegin(
 
     VMA_DEBUG_GLOBAL_MUTEX_LOCK
 
-    return allocator->DefragmentationBegin(*pInfo, pStats, pContext);
+    VkResult res = allocator->DefragmentationBegin(*pInfo, pStats, pContext);
+
+#if VMA_RECORDING_ENABLED
+    if(allocator->GetRecorder() != VMA_NULL)
+    {
+        allocator->GetRecorder()->RecordDefragmentationBegin(
+            allocator->GetCurrentFrameIndex(), *pInfo, *pContext);
+    }
+#endif
+
+    return res;
 }
 
 VkResult vmaDefragmentationEnd(
@@ -16002,6 +16054,14 @@ VkResult vmaDefragmentationEnd(
     {
         VMA_DEBUG_GLOBAL_MUTEX_LOCK
 
+#if VMA_RECORDING_ENABLED
+        if(allocator->GetRecorder() != VMA_NULL)
+        {
+            allocator->GetRecorder()->RecordDefragmentationEnd(
+                allocator->GetCurrentFrameIndex(), context);
+        }
+#endif
+
         return allocator->DefragmentationEnd(context);
     }
     else