From 7585864113c6c2363cf82c389d8e276e10f34a4c Mon Sep 17 00:00:00 2001
From: Rupesh <rupesh@wayline.com>
Date: Mon, 6 Apr 2026 01:51:29 -0700
Subject: [PATCH 1/2] Stop audio mixer on pipeline cancellation to prevent 100%
 CPU usage

---
 changelog/2955.fixed.md               | 1 +
 src/pipecat/transports/base_output.py | 4 ++++
 2 files changed, 5 insertions(+)
 create mode 100644 changelog/2955.fixed.md

diff --git a/changelog/2955.fixed.md b/changelog/2955.fixed.md
new file mode 100644
index 000000000..431eafc44
--- /dev/null
+++ b/changelog/2955.fixed.md
@@ -0,0 +1 @@
+- Fixed audio mixer not being stopped on pipeline cancellation, causing 100% CPU usage after call disconnect.
diff --git a/src/pipecat/transports/base_output.py b/src/pipecat/transports/base_output.py
index 15eb99f3a..1471e06b3 100644
--- a/src/pipecat/transports/base_output.py
+++ b/src/pipecat/transports/base_output.py
@@ -504,6 +504,10 @@ class BaseOutputTransport(FrameProcessor):
             await self._cancel_clock_task()
             await self._cancel_video_task()
 
+            # Stop audio mixer so it doesn't keep generating frames after cancellation.
+            if self._mixer:
+                await self._mixer.stop()
+
         async def handle_interruptions(self, _: InterruptionFrame):
             """Handle interruption events by restarting tasks and clearing buffers.
 

From 67ee802772c714d5e2a0c2ca2a1e2e1e784a33be Mon Sep 17 00:00:00 2001
From: Rupesh <rupesh@wayline.com>
Date: Mon, 6 Apr 2026 21:36:53 -0700
Subject: [PATCH 2/2] Remove changelog entry per review feedback

---
 changelog/2955.fixed.md | 1 -
 1 file changed, 1 deletion(-)
 delete mode 100644 changelog/2955.fixed.md

diff --git a/changelog/2955.fixed.md b/changelog/2955.fixed.md
deleted file mode 100644
index 431eafc44..000000000
--- a/changelog/2955.fixed.md
+++ /dev/null
@@ -1 +0,0 @@
-- Fixed audio mixer not being stopped on pipeline cancellation, causing 100% CPU usage after call disconnect.