Poll the controllers with the same timing as movies for netplay. Might help prevent desyncs.

Source/Core/Core/Src/HW/SI.cpp

@@ -7,6 +7,7 @@
 #include "../ConfigManager.h"
 #include "../CoreTiming.h"
 #include "../Movie.h"
+#include "../NetPlay.h"
 
 #include "SystemTimers.h"
 #include "ProcessorInterface.h"
@@ -641,7 +642,7 @@ void RunSIBuffer()
 int GetTicksToNextSIPoll()
 {
 	// Poll for input at regular intervals (once per frame) when playing or recording a movie
-	if (Movie::IsPlayingInput() || Movie::IsRecordingInput())
+	if (Movie::IsPlayingInput() || Movie::IsRecordingInput() || NetPlay::GetNetPlayPtr())
 	{
 		return SystemTimers::GetTicksPerSecond() / VideoInterface::TargetRefreshRate;
 	}

Source/Core/Core/Src/NetPlay.cpp

@@ -386,3 +386,8 @@ bool CWII_IPC_HLE_WiiMote::NetPlay_WiimoteInput(int, u16, const void*, u32&)
 	else
 		return false;
 }
+
+NetPlay* NetPlay::GetNetPlayPtr()
+{
+	return netplay_ptr;
+}

Source/Core/Core/Src/NetPlay.h

@@ -119,6 +119,7 @@ public:
 	//void PushPadStates(unsigned int count);
 
 	u8 GetPadNum(u8 numPAD);
+	static NetPlay* GetNetPlayPtr();
 
 protected:
 	//void GetBufferedPad(const u8 pad_nb, NetPad* const netvalues);