fix ux

src/lerobot/scripts/lerobot_create_advantage_video.py

@@ -306,52 +306,57 @@ def _draw_dashboard(
     return dashboard
 
 
-def _draw_status_badge(
+def _draw_label_timeline(
     frame: np.ndarray,
-    label: str,
-    intervention: bool,
-    episode_index: int,
+    labels: np.ndarray,
+    current_index: int,
 ) -> None:
-    del episode_index
-    if label == "positive":
-        text = "POSITIVE"
-        color = THEME.positive
-    else:
-        text = "NEGATIVE"
-        color = THEME.negative
-    if intervention:
-        text = "POSITIVE  ·  HUMAN CORRECTION"
-
     height, width = frame.shape[:2]
     horizontal_margin = max(18, round(width * 0.04))
-    bar_height = max(34, round(height * 0.075))
+    bar_height = max(26, round(height * 0.055))
     bottom_margin = max(14, round(height * 0.03))
     x0 = horizontal_margin
     x1 = width - horizontal_margin
     y1 = height - bottom_margin
     y0 = y1 - bar_height
-    radius = max(8, bar_height // 3)
+    radius = max(6, bar_height // 3)
 
     _alpha_rounded_rectangle(
         frame,
         (x0, y0),
         (x1, y1),
-        color,
-        alpha=0.58,
+        THEME.background,
+        alpha=0.36,
         radius=radius,
     )
 
-    font_scale = max(0.5, min(0.8, width / 1100))
-    text_size = cv2.getTextSize(text, cv2.FONT_HERSHEY_SIMPLEX, font_scale, 1)[0]
-    text_x = x0 + (x1 - x0 - text_size[0]) // 2
-    text_y = y0 + (bar_height + text_size[1]) // 2
-    _draw_text(
+    inset = max(3, bar_height // 8)
+    inner_x0, inner_x1 = x0 + inset, x1 - inset
+    inner_y0, inner_y1 = y0 + inset, y1 - inset
+    timeline_width = inner_x1 - inner_x0
+    count = max(len(labels), 1)
+    overlay = frame.copy()
+    for start, end, label in _contiguous_segments(labels):
+        segment_x0 = inner_x0 + round(timeline_width * start / count)
+        segment_x1 = inner_x0 + round(timeline_width * end / count)
+        color = THEME.positive if label == "positive" else THEME.negative
+        cv2.rectangle(
+            overlay,
+            (segment_x0, inner_y0),
+            (max(segment_x0 + 1, segment_x1), inner_y1),
+            color,
+            -1,
+        )
+    cv2.addWeighted(overlay, 0.56, frame, 0.44, 0, dst=frame)
+
+    marker_x = inner_x0 + round(timeline_width * current_index / max(len(labels) - 1, 1))
+    cv2.line(
         frame,
-        text,
-        (text_x, text_y),
-        scale=font_scale,
-        color=(255, 255, 255),
-        thickness=1,
+        (marker_x, y0 - 3),
+        (marker_x, y1 + 3),
+        THEME.marker,
+        2,
+        cv2.LINE_AA,
     )
 
 
@@ -564,19 +569,17 @@ def create_advantage_video(
         end_timestamp,
     )
     written = 0
+    labels = episode["advantage_label"].astype(str).to_numpy()
     try:
         for index in range(expected_frames):
             ok, frame = capture.read()
             if not ok:
                 logger.warning("Video ended after %d/%d frames", index, expected_frames)
                 break
-            row = episode.iloc[index]
-            intervention = bool(row["intervention"]) if "intervention" in episode else False
-            _draw_status_badge(
+            _draw_label_timeline(
                 frame,
-                str(row["advantage_label"]),
-                intervention,
-                episode_index,
+                labels,
+                index,
             )
             writer.write(frame)
             written += 1

tests/scripts/test_create_advantage_video.py

@@ -10,7 +10,7 @@ from lerobot.scripts.lerobot_create_advantage_video import (
     _contiguous_segments,
     _create_decode_proxy,
     _draw_dashboard,
-    _draw_status_badge,
+    _draw_label_timeline,
 )
 
 
@@ -52,12 +52,14 @@ def test_advantage_dashboard_shape():
     assert dashboard.var() > 0
 
 
-def test_status_badge_modifies_frame():
+def test_label_timeline_modifies_only_lower_frame_region():
     frame = np.zeros((480, 640, 3), dtype=np.uint8)
+    labels = np.array(["negative", "negative", "positive", "positive"])
 
-    _draw_status_badge(frame, "positive", intervention=False, episode_index=12)
+    _draw_label_timeline(frame, labels, current_index=2)
 
     assert frame.sum() > 0
+    assert frame[:350].sum() == 0
 
 
 @pytest.mark.skipif(shutil.which("ffmpeg") is None, reason="ffmpeg is required")