feat(clip): add timestamp onto clip (#35182)

* feat(clip): add timestamp onto clip

* same font size as title

* revert

* just declare it here, and add comments

tools/clip/run.py

@@ -165,12 +165,16 @@ def clip(data_dir: str | None, quality: Literal['low', 'high'], prefix: str, rou
   # TODO: evaluate creating fn that inspects /tmp/.X11-unix and creates unused display to avoid possibility of collision
   display = f':{randint(99, 999)}'
 
+  box_style = 'box=1:boxcolor=black@0.33:boxborderw=7'
   meta_text = get_meta_text(route)
   overlays = [
-    f"drawtext=text='{escape_ffmpeg_text(meta_text)}':fontfile=Inter.tff:fontcolor=white:fontsize=18:box=1:boxcolor=black@0.33:boxborderw=7:x=(w-text_w)/2:y=5.5:enable='between(t,1,5)'"
+    # metadata overlay
+    f"drawtext=text='{escape_ffmpeg_text(meta_text)}':fontfile=Inter.tff:fontcolor=white:fontsize=18:{box_style}:x=(w-text_w)/2:y=5.5:enable='between(t,1,5)'",
+    # route time overlay
+    f"drawtext=text='%{{eif\\:floor(({start}+t)/60)\\:d\\:2}}\\:%{{eif\\:mod({start}+t\\,60)\\:d\\:2}}':fontfile=Inter.tff:fontcolor=white:fontsize=24:{box_style}:x=w-text_w-38:y=38"
   ]
   if title:
-    overlays.append(f"drawtext=text='{escape_ffmpeg_text(title)}':fontfile=Inter.tff:fontcolor=white:fontsize=32:box=1:boxcolor=black@0.33:boxborderw=10:x=(w-text_w)/2:y=53")
+    overlays.append(f"drawtext=text='{escape_ffmpeg_text(title)}':fontfile=Inter.tff:fontcolor=white:fontsize=32:{box_style}:x=(w-text_w)/2:y=53")
 
   ffmpeg_cmd = [
     'ffmpeg', '-y', '-video_size', RESOLUTION, '-framerate', str(FRAMERATE), '-f', 'x11grab', '-draw_mouse', '0',