revert #4583 (#4606)

This reverts commit 500d18b6c6.

internal/staticsources/rtmp/source_test.go

@@ -83,6 +83,9 @@ func TestSource(t *testing.T) {
 						err = w.WriteH264(2*time.Second, 2*time.Second, [][]byte{{5, 2, 3, 4}})
 						require.NoError(t, err)
 
+						err = w.WriteH264(3*time.Second, 3*time.Second, [][]byte{{5, 2, 3, 4}})
+						require.NoError(t, err)
+
 						break
 					}
 				}()
@@ -101,16 +104,6 @@ func TestSource(t *testing.T) {
 
 				source += "localhost/teststream"
 
-				n := 0
-				timeNow = func() time.Time {
-					d := time.Date(2009, 5, 20, 22, 15, 25, 427000, time.Local).Add(time.Duration(n) * 2 * time.Second)
-					n++
-					return d
-				}
-				defer func() {
-					timeNow = time.Now
-				}()
-
 				te := test.NewSourceTester(
 					func(p defs.StaticSourceParent) defs.StaticSource {
 						return &Source{