diff --git a/testdata/ffmpeg.d/cmd/prune/main.go b/testdata/ffmpeg.d/cmd/prune/main.go
index c6a867c..0f501e6 100644
--- a/testdata/ffmpeg.d/cmd/prune/main.go
+++ b/testdata/ffmpeg.d/cmd/prune/main.go
@@ -69,13 +69,18 @@ func Run(ctx context.Context, args []string) error {
 					outd := strings.ReplaceAll(cam, "record", "movement")
 					os.MkdirAll(outd, os.ModePerm)
 					cmd := exec.CommandContext(ctx,
-						"ffmpeg",
-						"-y",
-						"-framerate", "1",
-						"-pattern_type", "glob",
-						"-i", path.Join(cam, series)+".*.jpg",
-						"-r", "3",
-						path.Join(outd, series+".webm"),
+						"convert",
+						append(seriesFiles,
+							"-delay", "20", // 20 frames at 60fps
+							path.Join(outd, series+".gif"),
+						)...,
+					//"ffmpeg",
+					//"-y",
+					//"-framerate", "1",
+					//"-pattern_type", "glob",
+					//"-i", path.Join(cam, series)+".*.jpg",
+					//"-r", "3",
+					//path.Join(outd, series+".webm"),
 					)
 					if out, err := cmd.CombinedOutput(); err != nil {
 						return fmt.Errorf("failed to webm series %s: (%w) %s", series, err, out)