diff --git a/rpcs3/Emu/Cell/Modules/cellVdec.cpp b/rpcs3/Emu/Cell/Modules/cellVdec.cpp
index 9268acb45c..f333e79303 100644
--- a/rpcs3/Emu/Cell/Modules/cellVdec.cpp
+++ b/rpcs3/Emu/Cell/Modules/cellVdec.cpp
@@ -26,6 +26,26 @@ std::mutex g_mutex_avcodec_open2;
 
 LOG_CHANNEL(cellVdec);
 
+template<>
+void fmt_class_string<CellVdecError>::format(std::string& out, u64 arg)
+{
+	format_enum(out, arg, [](auto error)
+	{
+		switch (error)
+		{
+			STR_CASE(CELL_VDEC_ERROR_ARG);
+			STR_CASE(CELL_VDEC_ERROR_SEQ);
+			STR_CASE(CELL_VDEC_ERROR_BUSY);
+			STR_CASE(CELL_VDEC_ERROR_EMPTY);
+			STR_CASE(CELL_VDEC_ERROR_AU);
+			STR_CASE(CELL_VDEC_ERROR_PIC);
+			STR_CASE(CELL_VDEC_ERROR_FATAL);
+		}
+
+		return unknown;
+	});
+}
+
 vm::gvar<s32> _cell_vdec_prx_ver; // ???
 
 constexpr struct vdec_start_seq_t{} vdec_start_seq{};
@@ -398,7 +418,7 @@ static void vdecEntry(ppu_thread& ppu, u32 vid)
 	ppu.state += cpu_flag::exit;
 }
 
-static u32 vdecQueryAttr(s32 type, u32 profile, u32 spec_addr /* may be 0 */, vm::ptr<CellVdecAttr> attr)
+static error_code vdecQueryAttr(s32 type, u32 profile, u32 spec_addr /* may be 0 */, vm::ptr<CellVdecAttr> attr)
 {
 	switch (type) // TODO: check profile levels
 	{
@@ -416,14 +436,14 @@ static u32 vdecQueryAttr(s32 type, u32 profile, u32 spec_addr /* may be 0 */, vm
 	return CELL_OK;
 }
 
-s32 cellVdecQueryAttr(vm::cptr<CellVdecType> type, vm::ptr<CellVdecAttr> attr)
+error_code cellVdecQueryAttr(vm::cptr<CellVdecType> type, vm::ptr<CellVdecAttr> attr)
 {
 	cellVdec.warning("cellVdecQueryAttr(type=*0x%x, attr=*0x%x)", type, attr);
 
 	return vdecQueryAttr(type->codecType, type->profileLevel, 0, attr);
 }
 
-s32 cellVdecQueryAttrEx(vm::cptr<CellVdecTypeEx> type, vm::ptr<CellVdecAttr> attr)
+error_code cellVdecQueryAttrEx(vm::cptr<CellVdecTypeEx> type, vm::ptr<CellVdecAttr> attr)
 {
 	cellVdec.warning("cellVdecQueryAttrEx(type=*0x%x, attr=*0x%x)", type, attr);
 
@@ -431,7 +451,7 @@ s32 cellVdecQueryAttrEx(vm::cptr<CellVdecTypeEx> type, vm::ptr<CellVdecAttr> att
 }
 
 template <typename T, typename U>
-static s32 vdecOpen(ppu_thread& ppu, T type, U res, vm::cptr<CellVdecCb> cb, vm::ptr<u32> handle)
+static error_code vdecOpen(ppu_thread& ppu, T type, U res, vm::cptr<CellVdecCb> cb, vm::ptr<u32> handle)
 {
 	if (!type || !res || !cb || !handle)
 	{
@@ -467,21 +487,21 @@ static s32 vdecOpen(ppu_thread& ppu, T type, U res, vm::cptr<CellVdecCb> cb, vm:
 	return CELL_OK;
 }
 
-s32 cellVdecOpen(ppu_thread& ppu, vm::cptr<CellVdecType> type, vm::cptr<CellVdecResource> res, vm::cptr<CellVdecCb> cb, vm::ptr<u32> handle)
+error_code cellVdecOpen(ppu_thread& ppu, vm::cptr<CellVdecType> type, vm::cptr<CellVdecResource> res, vm::cptr<CellVdecCb> cb, vm::ptr<u32> handle)
 {
 	cellVdec.warning("cellVdecOpen(type=*0x%x, res=*0x%x, cb=*0x%x, handle=*0x%x)", type, res, cb, handle);
 
 	return vdecOpen(ppu, type, res, cb, handle);
 }
 
-s32 cellVdecOpenEx(ppu_thread& ppu, vm::cptr<CellVdecTypeEx> type, vm::cptr<CellVdecResourceEx> res, vm::cptr<CellVdecCb> cb, vm::ptr<u32> handle)
+error_code cellVdecOpenEx(ppu_thread& ppu, vm::cptr<CellVdecTypeEx> type, vm::cptr<CellVdecResourceEx> res, vm::cptr<CellVdecCb> cb, vm::ptr<u32> handle)
 {
 	cellVdec.warning("cellVdecOpenEx(type=*0x%x, res=*0x%x, cb=*0x%x, handle=*0x%x)", type, res, cb, handle);
 
 	return vdecOpen(ppu, type, res, cb, handle);
 }
 
-s32 cellVdecClose(ppu_thread& ppu, u32 handle)
+error_code cellVdecClose(ppu_thread& ppu, u32 handle)
 {
 	cellVdec.warning("cellVdecClose(handle=0x%x)", handle);
 
@@ -506,7 +526,7 @@ s32 cellVdecClose(ppu_thread& ppu, u32 handle)
 	return CELL_OK;
 }
 
-s32 cellVdecStartSeq(u32 handle)
+error_code cellVdecStartSeq(u32 handle)
 {
 	cellVdec.trace("cellVdecStartSeq(handle=0x%x)", handle);
 
@@ -521,7 +541,7 @@ s32 cellVdecStartSeq(u32 handle)
 	return CELL_OK;
 }
 
-s32 cellVdecEndSeq(u32 handle)
+error_code cellVdecEndSeq(u32 handle)
 {
 	cellVdec.warning("cellVdecEndSeq(handle=0x%x)", handle);
 
@@ -536,7 +556,7 @@ s32 cellVdecEndSeq(u32 handle)
 	return CELL_OK;
 }
 
-s32 cellVdecDecodeAu(u32 handle, CellVdecDecodeMode mode, vm::cptr<CellVdecAuInfo> auInfo)
+error_code cellVdecDecodeAu(u32 handle, CellVdecDecodeMode mode, vm::cptr<CellVdecAuInfo> auInfo)
 {
 	cellVdec.trace("cellVdecDecodeAu(handle=0x%x, mode=%d, auInfo=*0x%x)", handle, (s32)mode, auInfo);
 
@@ -557,13 +577,13 @@ s32 cellVdecDecodeAu(u32 handle, CellVdecDecodeMode mode, vm::cptr<CellVdecAuInf
 	return CELL_OK;
 }
 
-s32 cellVdecDecodeAuEx2()
+error_code cellVdecDecodeAuEx2()
 {
 	UNIMPLEMENTED_FUNC(cellVdec);
 	return CELL_OK;
 }
 
-s32 cellVdecGetPicture(u32 handle, vm::cptr<CellVdecPicFormat> format, vm::ptr<u8> outBuff)
+error_code cellVdecGetPicture(u32 handle, vm::cptr<CellVdecPicFormat> format, vm::ptr<u8> outBuff)
 {
 	cellVdec.trace("cellVdecGetPicture(handle=0x%x, format=*0x%x, outBuff=*0x%x)", handle, format, outBuff);
 
@@ -670,7 +690,7 @@ s32 cellVdecGetPicture(u32 handle, vm::cptr<CellVdecPicFormat> format, vm::ptr<u
 	return CELL_OK;
 }
 
-s32 cellVdecGetPictureExt(u32 handle, vm::cptr<CellVdecPicFormat2> format2, vm::ptr<u8> outBuff, u32 arg4)
+error_code cellVdecGetPictureExt(u32 handle, vm::cptr<CellVdecPicFormat2> format2, vm::ptr<u8> outBuff, u32 arg4)
 {
 	cellVdec.warning("cellVdecGetPictureExt(handle=0x%x, format2=*0x%x, outBuff=*0x%x, arg4=*0x%x)", handle, format2, outBuff, arg4);
 
@@ -687,7 +707,7 @@ s32 cellVdecGetPictureExt(u32 handle, vm::cptr<CellVdecPicFormat2> format2, vm::
 	return cellVdecGetPicture(handle, format, outBuff);
 }
 
-s32 cellVdecGetPicItem(u32 handle, vm::pptr<CellVdecPicItem> picItem)
+error_code cellVdecGetPicItem(u32 handle, vm::pptr<CellVdecPicItem> picItem)
 {
 	cellVdec.trace("cellVdecGetPicItem(handle=0x%x, picItem=**0x%x)", handle, picItem);
 
@@ -891,7 +911,7 @@ s32 cellVdecGetPicItem(u32 handle, vm::pptr<CellVdecPicItem> picItem)
 	return CELL_OK;
 }
 
-s32 cellVdecSetFrameRate(u32 handle, CellVdecFrameRate frc)
+error_code cellVdecSetFrameRate(u32 handle, CellVdecFrameRate frc)
 {
 	cellVdec.trace("cellVdecSetFrameRate(handle=0x%x, frc=0x%x)", handle, (s32)frc);
 
@@ -907,37 +927,37 @@ s32 cellVdecSetFrameRate(u32 handle, CellVdecFrameRate frc)
 	return CELL_OK;
 }
 
-s32 cellVdecOpenExt()
+error_code cellVdecOpenExt()
 {
 	UNIMPLEMENTED_FUNC(cellVdec);
 	return CELL_OK;
 }
 
-s32 cellVdecStartSeqExt()
+error_code cellVdecStartSeqExt()
 {
 	UNIMPLEMENTED_FUNC(cellVdec);
 	return CELL_OK;
 }
 
-s32 cellVdecGetPicItemEx()
+error_code cellVdecGetPicItemEx()
 {
 	UNIMPLEMENTED_FUNC(cellVdec);
 	return CELL_OK;
 }
 
-s32 cellVdecGetPicItemExt()
+error_code cellVdecGetPicItemExt()
 {
 	UNIMPLEMENTED_FUNC(cellVdec);
 	return CELL_OK;
 }
 
-s32 cellVdecSetFrameRateExt()
+error_code cellVdecSetFrameRateExt()
 {
 	UNIMPLEMENTED_FUNC(cellVdec);
 	return CELL_OK;
 }
 
-s32 cellVdecSetPts()
+error_code cellVdecSetPts()
 {
 	UNIMPLEMENTED_FUNC(cellVdec);
 	return CELL_OK;
diff --git a/rpcs3/Emu/Cell/Modules/cellVdec.h b/rpcs3/Emu/Cell/Modules/cellVdec.h
index f67e48f913..b99b4ccb98 100644
--- a/rpcs3/Emu/Cell/Modules/cellVdec.h
+++ b/rpcs3/Emu/Cell/Modules/cellVdec.h
@@ -3,7 +3,7 @@
 #include "Utilities/BEType.h"
 
 // Error Codes
-enum
+enum CellVdecError : u32
 {
 	CELL_VDEC_ERROR_ARG   = 0x80610101,
 	CELL_VDEC_ERROR_SEQ   = 0x80610102,