diff --git a/testdata/ffmpeg.d/cmd/prune/main.go b/testdata/ffmpeg.d/cmd/prune/main.go
index 0262415..26c1605 100644
--- a/testdata/ffmpeg.d/cmd/prune/main.go
+++ b/testdata/ffmpeg.d/cmd/prune/main.go
@@ -109,6 +109,46 @@ func Run(ctx context.Context, args []string) error {
 			}
 		}
 	}
+
+	for _, cam := range cams {
+		camMovementD := strings.ReplaceAll(cam, "record", "movement")
+
+		movementFiles, err := lsf(camMovementD)
+		if err != nil {
+			return err
+		}
+		sort.Strings(movementFiles)
+
+		var sizeOfCamDMiB int64
+		for _, movementFile := range movementFiles {
+			stat, err := os.Stat(movementFile)
+			if err != nil {
+				return err
+			}
+			fileSizeMiB := stat.Size() / 1024 / 1024
+			sizeOfCamDMiB += fileSizeMiB
+		}
+
+		GiB100 := int64(100 * 1024)
+		for sizeOfCamDMiB > GiB100 && len(movementFiles) > 0 {
+			oldestFile := movementFiles[0]
+
+			oldestFileStat, err := os.Stat(oldestFile)
+			if err != nil {
+				return err
+			}
+			oldestFileSizeMiB := oldestFileStat.Size() / 1024 / 1024
+
+			log.Println("deleting old file", oldestFile)
+			if err := os.Remove(oldestFile); err != nil {
+				return err
+			}
+
+			sizeOfCamDMiB -= oldestFileSizeMiB
+			movementFiles = movementFiles[1:]
+		}
+	}
+
 	return nil
 }