diff --git a/codec_hardware_config.go b/codec_hardware_config.go
index 7b9d973..613c556 100644
--- a/codec_hardware_config.go
+++ b/codec_hardware_config.go
@@ -6,10 +6,10 @@ import "C"
 
 // https://github.com/FFmpeg/FFmpeg/blob/n5.0/libavcodec/codec.h#L460
 type CodecHardwareConfig struct {
-	c *C.AVCodecHWConfig
+	c *C.struct_AVCodecHWConfig
 }
 
-func newCodecHardwareConfigFromC(c *C.AVCodecHWConfig) CodecHardwareConfig {
+func newCodecHardwareConfigFromC(c *C.struct_AVCodecHWConfig) CodecHardwareConfig {
 	return CodecHardwareConfig{c: c}
 }
 
diff --git a/filter_graph.go b/filter_graph.go
index 2d8c783..b9dcc06 100644
--- a/filter_graph.go
+++ b/filter_graph.go
@@ -43,6 +43,22 @@ func (g *FilterGraph) Class() *Class {
 	return newClassFromC(unsafe.Pointer(g.c))
 }
 
+func (g *FilterGraph) ThreadCount() int {
+	return int(g.c.nb_threads)
+}
+
+func (g *FilterGraph) SetThreadCount(threadCount int) {
+	g.c.nb_threads = C.int(threadCount)
+}
+
+func (g *FilterGraph) ThreadType() ThreadType {
+	return ThreadType(g.c.thread_type)
+}
+
+func (g *FilterGraph) SetThreadType(t ThreadType) {
+	g.c.thread_type = C.int(t)
+}
+
 type FilterArgs map[string]string
 
 func (args FilterArgs) String() string {
diff --git a/filter_graph_test.go b/filter_graph_test.go
index 46d750d..9ea02bf 100644
--- a/filter_graph_test.go
+++ b/filter_graph_test.go
@@ -17,6 +17,10 @@ func TestFilterGraph(t *testing.T) {
 	cl := fg.Class()
 	require.NotNil(t, cl)
 	require.Equal(t, "AVFilterGraph", cl.Name())
+	fg.SetThreadCount(2)
+	require.Equal(t, 2, fg.ThreadCount())
+	fg.SetThreadType(ThreadTypeSlice)
+	require.Equal(t, ThreadTypeSlice, fg.ThreadType())
 
 	bufferSink := FindFilterByName("buffersink")
 	require.NotNil(t, bufferSink)
diff --git a/hardware_device_context.go b/hardware_device_context.go
index c832745..ee97fe0 100644
--- a/hardware_device_context.go
+++ b/hardware_device_context.go
@@ -10,7 +10,7 @@ import (
 
 // https://github.com/FFmpeg/FFmpeg/blob/n5.0/libavutil/hwcontext.h#L61
 type HardwareDeviceContext struct {
-	c *C.AVBufferRef
+	c *C.struct_AVBufferRef
 }
 
 func CreateHardwareDeviceContext(t HardwareDeviceType, device string, options *Dictionary) (*HardwareDeviceContext, error) {
diff --git a/thread_type.go b/thread_type.go
index c824241..0db36d0 100644
--- a/thread_type.go
+++ b/thread_type.go
@@ -8,6 +8,7 @@ type ThreadType int
 
 // https://github.com/FFmpeg/FFmpeg/blob/n5.0/libavcodec/avcodec.h#L1451
 const (
-	ThreadTypeFrame = ThreadType(C.FF_THREAD_FRAME)
-	ThreadTypeSlice = ThreadType(C.FF_THREAD_SLICE)
+	ThreadTypeFrame     = ThreadType(C.FF_THREAD_FRAME)
+	ThreadTypeSlice     = ThreadType(C.FF_THREAD_SLICE)
+	ThreadTypeUndefined = ThreadType(0)
 )