diff --git a/testdata/ffmpeg.d/cmd/prune/main.go b/testdata/ffmpeg.d/cmd/prune/main.go
index 41a8b3b..482a500 100644
--- a/testdata/ffmpeg.d/cmd/prune/main.go
+++ b/testdata/ffmpeg.d/cmd/prune/main.go
@@ -78,7 +78,7 @@ func Run(ctx context.Context, args []string) error {
 						path.Join(outd, series+".gif"),
 					)
 					if out, err := cmd.CombinedOutput(); err != nil {
-						return fmt.Errorf("failed to webm series %s: (%w) %s", series, err, out)
+						return fmt.Errorf("failed to persist series %s: (%w) %s", series, err, out)
 					}
 				}
 				for _, seriesFile := range seriesFiles {
diff --git a/testdata/ffmpeg.d/cmd/prune/main_test.go b/testdata/ffmpeg.d/cmd/prune/main_test.go
index feafba6..92b9707 100644
--- a/testdata/ffmpeg.d/cmd/prune/main_test.go
+++ b/testdata/ffmpeg.d/cmd/prune/main_test.go
@@ -46,19 +46,19 @@ func TestRun(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	start := time.Now()
 	if err := Run(context.Background(), []string{path.Dir(d), "1s"}); err != nil {
 		t.Error(err)
 		time.Sleep(time.Minute)
 		t.Fatal(err)
 	}
+	t.Log(time.Since(start))
 
 	if results, err := lsf(path.Join(path.Dir(d), "movement")); err != nil {
 		t.Fatal("failed to lsf for results:", err)
 	} else if len(results) != 1 {
 		t.Fatal(results)
-	} else if path.Base(results[0]) != "series.webm" {
-		t.Error(results[0])
-		time.Sleep(time.Minute)
+	} else if path.Base(results[0]) != "series.gif" {
 		t.Fatal(results)
 	}