Fixing the audio looping and pause narration issue

tests/test_chunking_v2.py

@@ -71,6 +71,27 @@ def test_audio():
     check("full render includes music with no seek", "music" in full and full["music"].src_offset == 0.0)
 
 
+def test_crossfade_phase():
+    print("crossfade loop phase:")
+    # Looping pad with a 15s crossfade overlap: the crossfade stream repeats every
+    # (duration - overlap) = 60 - 15 = 45s, so a chunk starting at into=300 resumes
+    # at crossfade phase 300 % 45 = 30, while the hard-loop phase is 300 % 60 = 60→0.
+    audio = {"pad": AudioDefinition(file="pad.wav", loop=True, duration=60.0, overlap=15.0)}
+    markers = [MarkerTiming(marker_id="Apad", timestamp=0.0, context="", confidence=1.0)]
+    evs = {e.audio_id: e for e in _extract_audio_events(markers, audio, time_range=(300.0, 600.0))}
+    check("looping pad with overlap is included", "pad" in evs)
+    if "pad" in evs:
+        p = evs["pad"]
+        check("crossfade seeks to loop_len phase 30.0",
+              abs(p.crossfade_offset - 30.0) < 1e-6, f"crossfade_offset={p.crossfade_offset}")
+        check("src_offset still uses full-duration phase 0.0",
+              abs(p.src_offset - 0.0) < 1e-6, f"src_offset={p.src_offset}")
+    # Full render: no phase seek on either.
+    full = {e.audio_id: e for e in _extract_audio_events(markers, audio, time_range=None)}
+    check("full render pad has no crossfade seek",
+          "pad" in full and full["pad"].crossfade_offset == 0.0)
+
+
 # ── video ────────────────────────────────────────────────────────────────────
 def test_video():
     print("video events:")
@@ -115,6 +136,7 @@ def test_video():
 
 if __name__ == "__main__":
     test_audio()
+    test_crossfade_phase()
     test_video()
     print()
     if _fails: