From ff3b744a05924c13cfd7c268d87e72ee6bdd0538 Mon Sep 17 00:00:00 2001
From: Ben Sima <ben@bsima.me>
Date: Fri, 21 Nov 2025 01:04:09 -0500
Subject: feat: implement t-1rf15iH

---
 Biz/PodcastItLater/Worker.py | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/Biz/PodcastItLater/Worker.py b/Biz/PodcastItLater/Worker.py
index 5203490..48793cd 100644
--- a/Biz/PodcastItLater/Worker.py
+++ b/Biz/PodcastItLater/Worker.py
@@ -60,6 +60,8 @@ MAX_RETRIES = 3
 TTS_MODEL = "tts-1"
 TTS_VOICE = "alloy"
 MEMORY_THRESHOLD = 80  # Percentage threshold for memory usage
+CROSSFADE_DURATION = 500  # ms for crossfading segments
+PAUSE_DURATION = 1000  # ms for silence between segments
 
 
 class ShutdownHandler:
@@ -358,7 +360,7 @@ class ArticleProcessor:
         content_audio: bytes,
         outro_audio: bytes,
     ) -> bytes:
-        """Combine intro, content, and outro with 1-second pauses.
+        """Combine intro, content, and outro with crossfades.
 
         Args:
             intro_audio: MP3 bytes for intro
@@ -373,11 +375,27 @@ class ArticleProcessor:
         content = AudioSegment.from_mp3(io.BytesIO(content_audio))
         outro = AudioSegment.from_mp3(io.BytesIO(outro_audio))
 
-        # Create 1-second silence
-        pause = AudioSegment.silent(duration=1000)  # milliseconds
+        # Create bridge silence (pause + 2 * crossfade to account for overlap)
+        bridge = AudioSegment.silent(duration=PAUSE_DURATION + 2 * CROSSFADE_DURATION)
 
-        # Combine segments with pauses
-        combined = intro + pause + content + pause + outro
+        def safe_append(seg1: AudioSegment, seg2: AudioSegment, crossfade: int) -> AudioSegment:
+            if len(seg1) < crossfade or len(seg2) < crossfade:
+                logger.warning(
+                    "Segment too short for crossfade (%dms vs %dms/%dms), using concatenation",
+                    crossfade,
+                    len(seg1),
+                    len(seg2),
+                )
+                return seg1 + seg2
+            return seg1.append(seg2, crossfade=crossfade)
+
+        # Combine segments with crossfades
+        # Intro -> Bridge -> Content -> Bridge -> Outro
+        # This effectively fades out the previous segment and fades in the next one
+        combined = safe_append(intro, bridge, CROSSFADE_DURATION)
+        combined = safe_append(combined, content, CROSSFADE_DURATION)
+        combined = safe_append(combined, bridge, CROSSFADE_DURATION)
+        combined = safe_append(combined, outro, CROSSFADE_DURATION)
 
         # Export to bytes
         output = io.BytesIO()
-- 
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