diff --git a/platypush/backend/http/webapp/src/components/panels/Camera/Index.vue b/platypush/backend/http/webapp/src/components/panels/Camera/Index.vue
index 3c93b9b7..1aec37fd 100644
--- a/platypush/backend/http/webapp/src/components/panels/Camera/Index.vue
+++ b/platypush/backend/http/webapp/src/components/panels/Camera/Index.vue
@@ -40,8 +40,7 @@
 
     <div class="audio-container">
       <audio autoplay preload="none" ref="player" v-if="audioOn">
-        <!--suppress HtmlUnknownTarget -->
-        <source :src="`/sound/stream?t=${(new Date()).getTime()}`" type="audio/x-wav;codec=pcm">
+        <source :src="`/sound/stream.aac?t=${(new Date()).getTime()}`">
         Your browser does not support audio elements
       </audio>
     </div>
diff --git a/platypush/backend/http/webapp/src/components/panels/Sound/Index.vue b/platypush/backend/http/webapp/src/components/panels/Sound/Index.vue
index 92c547ee..db46eea8 100644
--- a/platypush/backend/http/webapp/src/components/panels/Sound/Index.vue
+++ b/platypush/backend/http/webapp/src/components/panels/Sound/Index.vue
@@ -2,8 +2,7 @@
   <div class="sound">
     <div class="sound-container">
       <audio autoplay preload="none" ref="player" v-if="recording">
-        <!--suppress HtmlUnknownTarget -->
-        <source :src="`/sound/stream?t=${(new Date()).getTime()}`" type="audio/x-wav;codec=pcm">
+        <source :src="`/sound/stream.aac?t=${(new Date()).getTime()}`">
         Your browser does not support audio elements
       </audio>
     </div>
diff --git a/platypush/plugins/sound/_controllers/_recorder.py b/platypush/plugins/sound/_controllers/_recorder.py
index ef6adf26..4c139311 100644
--- a/platypush/plugins/sound/_controllers/_recorder.py
+++ b/platypush/plugins/sound/_controllers/_recorder.py
@@ -1,5 +1,3 @@
-from dataclasses import dataclass
-
 from typing import IO
 from typing_extensions import override
 
@@ -16,7 +14,6 @@ from .._model import AudioState
 from ._base import AudioThread
 
 
-@dataclass
 class AudioRecorder(AudioThread):
     """
     The ``AudioRecorder`` thread is responsible for recording audio from the
@@ -32,7 +29,7 @@ class AudioRecorder(AudioThread):
         # _ = frames
         # __ = time
         def callback(indata, outdata, _, __, status):
-            if self.state == AudioState.PAUSED:
+            if self.state != AudioState.RUNNING:
                 return
 
             if status:
@@ -41,7 +38,7 @@ class AudioRecorder(AudioThread):
             try:
                 audio_converter.write(indata.tobytes())
             except AssertionError as e:
-                self.logger.warning('Audio recorder callback error: %s', e)
+                self.logger.warning('Audio converter callback error: %s', e)
                 self.state = AudioState.STOPPED
                 return
 
@@ -63,8 +60,10 @@ class AudioRecorder(AudioThread):
 
     @override
     def notify_stop(self):
+        prev_state = self.state
         super().notify_stop()
-        get_bus().post(SoundRecordingStoppedEvent())
+        if prev_state != AudioState.STOPPED:
+            get_bus().post(SoundRecordingStoppedEvent())
 
 
 # vim:sw=4:ts=4:et:
diff --git a/platypush/plugins/sound/_converter.py b/platypush/plugins/sound/_converter.py
index 3aa307f2..bdab2d03 100644
--- a/platypush/plugins/sound/_converter.py
+++ b/platypush/plugins/sound/_converter.py
@@ -1,5 +1,6 @@
 import asyncio
 from asyncio.subprocess import PIPE
+from logging import getLogger
 from queue import Empty
 
 from queue import Queue
@@ -74,6 +75,7 @@ class ConverterProcess(Thread):
         self._closed = False
         self._out_queue = Queue()
         self.ffmpeg = None
+        self.logger = getLogger(__name__)
         self._loop = None
         self._should_stop = Event()
         self._stop_lock = RLock()
@@ -157,21 +159,21 @@ class ConverterProcess(Thread):
     def run(self):
         super().run()
         self._loop = get_or_create_event_loop()
-        self._loop.run_until_complete(self._audio_proxy(timeout=1))
+        try:
+            self._loop.run_until_complete(self._audio_proxy(timeout=1))
+        except RuntimeError as e:
+            self.logger.warning(e)
+        finally:
+            self.stop()
 
     def stop(self):
         with self._stop_lock:
             self._should_stop.set()
             if self.ffmpeg:
-                try:
-                    self.ffmpeg.kill()
-                except ProcessLookupError:
-                    pass
+                self.ffmpeg.kill()
 
             self.ffmpeg = None
-
-            if self._loop:
-                self._loop = None
+            self._loop = None
 
     @property
     def should_stop(self) -> bool: