movie output format improvement to compare two (forward - back )

[my fork](https://huggingface.co/spaces/DrHakase/full-body-anime-gan)

app.py

@@ -239,9 +239,11 @@ class Model:
         for i in range(0, frame_num):
             img = self.get_img(((1 - lin[i]) * w1) + (lin[i] * w2), noise)
             video.append_data(img)
+        for i in reversed(range(0, frame_num)):
+            img = self.get_img(((1 - lin[i]) * w1) + (lin[i] * w2), noise)
+            video.append_data(img)
         video.close()
 
-
 def get_thumbnail(img):
     img_new = np.full((256, 384, 3), 200, dtype=np.uint8)
     img_new[:, 128:256] = transform.resize(img, (256, 128), preserve_range=True)