diff --git a/program.go b/program.go
index f71a0d9..e00ef0d 100644
--- a/program.go
+++ b/program.go
@@ -77,8 +77,12 @@ func (p *Program) SetDiscard(d Discard) {
 }
 
 // https://ffmpeg.org/doxygen/7.0/structAVProgram.html#a7967d41af4812ed61a28762e988c7a02
-func (p *Program) StreamIndex() uint {
-	return uint(C.uint(*p.c.stream_index))
+func (p *Program) StreamIndex() *uint {
+	if p.c.stream_index == nil {
+		return nil
+	}
+	u := uint(C.uint(*p.c.stream_index))
+	return &u
 }
 
 // https://ffmpeg.org/doxygen/7.0/structAVProgram.html#ae9dab38d4694e3da9cba0f882f4e43d3
diff --git a/program_test.go b/program_test.go
index cc5c7f3..fb33bbc 100644
--- a/program_test.go
+++ b/program_test.go
@@ -16,14 +16,22 @@ func TestProgram(t *testing.T) {
 	require.Equal(t, 2, p.ID())
 	p.SetFlags(1)
 	require.Equal(t, 1, p.Flags())
-	p.SetProgramNumber(101)
-	require.Equal(t, 101, p.ProgramNumber())
 	p.SetDiscard(DiscardAll)
 	require.Equal(t, DiscardAll, p.Discard())
+	require.Nil(t, p.StreamIndex(), nil)
 	d := NewDictionary()
 	require.NoError(t, d.Set("service_name", "test_service_name", 0))
 	p.SetMetadata(d)
 	require.Equal(t, p.Metadata().Get("service_name", nil, 0).Value(), "test_service_name")
+	p.SetProgramNumber(101)
+	require.Equal(t, 101, p.ProgramNumber())
+	require.Equal(t, p.PmtPid(), 0)
+	require.Equal(t, p.PcrPid(), 0)
+	require.Equal(t, p.PmtVersion(), -1)
+	require.Equal(t, p.StartTime(), int64(-9223372036854775808))
+	require.Equal(t, p.EndTime(), int64(-9223372036854775808))
+	require.Equal(t, p.PtsWrapReference(), int64(-9223372036854775808))
+	require.Equal(t, p.PtsWrapBehavior(), 0)
 	s := fc.NewStream(nil)
 	s.SetID(2)
 	require.Equal(t, 0, p.NbStreams())