diff --git a/tests/lavfi-regression.sh b/tests/lavfi-regression.sh
index faa7bdd269..d00dfe6272 100755
--- a/tests/lavfi-regression.sh
+++ b/tests/lavfi-regression.sh
@@ -38,6 +38,7 @@ do_lavfi "fade"               "fade=in:5:15,fade=out:30:15"
 do_lavfi "null"               "null"
 do_lavfi "overlay"            "split[m],scale=88:72,pad=96:80:4:4[o2];[m]fifo,[o2]overlay=240:16"
 do_lavfi "pad"                "pad=iw*1.5:ih*1.5:iw*0.3:ih*0.2"
+do_lavfi "pp"                 "mp=pp=de/tn/l5/al"
 do_lavfi "scale200"           "scale=200:200"
 do_lavfi "scale500"           "scale=500:500"
 do_lavfi "select"             "select=not(eq(mod(n\,2)\,0)+eq(mod(n\,3)\,0))"
diff --git a/tests/ref/lavfi/pp b/tests/ref/lavfi/pp
new file mode 100644
index 0000000000..4d26254723
--- /dev/null
+++ b/tests/ref/lavfi/pp
@@ -0,0 +1 @@
+pp                  3ddfb037bb1f941d6526a2473a191677