diff --git a/manimlib/scene/scene_file_writer.py b/manimlib/scene/scene_file_writer.py
index 46875e83..6dd68ef5 100644
--- a/manimlib/scene/scene_file_writer.py
+++ b/manimlib/scene/scene_file_writer.py
@@ -230,16 +230,16 @@ class SceneFileWriter(object):
             '-pix_fmt', 'rgba',
             '-r', str(fps),  # frames per second
             '-i', '-',  # The imput comes from a pipe
-            '-c:v', 'h264_nvenc',
             '-an',  # Tells FFMPEG not to expect any audio
             '-loglevel', 'error',
         ]
+        # TODO, the test for a transparent background should not be based on
+        # the file extension.
         if self.movie_file_extension == ".mov":
-            # This is if the background of the exported video
-            # should be transparent.
+            # This is if the background of the exported
+            # video should be transparent.
             command += [
                 '-vcodec', 'qtrle',
-                # '-vcodec', 'png',
             ]
         else:
             command += [
diff --git a/active_projects/spirals.py b/old_projects/spirals.py
similarity index 99%
rename from active_projects/spirals.py
rename to old_projects/spirals.py
index 758f02dc..0c67611d 100644
--- a/active_projects/spirals.py
+++ b/old_projects/spirals.py
@@ -4912,13 +4912,18 @@ class Thumbnail(SpiralScene):
         dots.set_fill([TEAL_E, TEAL_A])
         dots.set_stroke(BLACK, 1)
 
-        label = VGroup(
-            TextMobject("$(p, p)$ for all primes $p$, in polar"),
+        label = TextMobject(
+            "($p$, $p$) for all primes $p$,\\\\",
+            "in polar coordinates",
+            tex_to_color_map={
+                "$p$": YELLOW,
+            },
         )
+
         label.scale(2)
         label.set_stroke(BLACK, 10, background=True)
-        label.add_background_rectangle()
-        label.to_corner(DL)
+        label.add_background_rectangle_to_submobjects()
+        label.to_corner(DL, MED_LARGE_BUFF)
 
         self.add(dots)
         self.add(label)