diff --git a/__pycache__/main.cpython-313.pyc b/__pycache__/main.cpython-313.pyc
index 765a8d8..cdc3c17 100644
Binary files a/__pycache__/main.cpython-313.pyc and b/__pycache__/main.cpython-313.pyc differ
diff --git a/build/main/Analysis-00.toc b/build/main/Analysis-00.toc
index f465d4c..95676c2 100644
--- a/build/main/Analysis-00.toc
+++ b/build/main/Analysis-00.toc
@@ -380,18 +380,6 @@
   ('pathlib._abc',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\pathlib\\_abc.py',
    'PYMODULE'),
-  ('json',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\json\\__init__.py',
-   'PYMODULE'),
-  ('json.encoder',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\json\\encoder.py',
-   'PYMODULE'),
-  ('json.decoder',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\json\\decoder.py',
-   'PYMODULE'),
-  ('json.scanner',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\json\\scanner.py',
-   'PYMODULE'),
   ('__future__',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\__future__.py',
    'PYMODULE'),
@@ -503,18 +491,18 @@
   ('multiprocessing',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\multiprocessing\\__init__.py',
    'PYMODULE'),
-  ('_colorize',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\_colorize.py',
-   'PYMODULE'),
-  ('_py_abc',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\_py_abc.py',
-   'PYMODULE'),
   ('stringprep',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\stringprep.py',
    'PYMODULE'),
   ('tracemalloc',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\tracemalloc.py',
    'PYMODULE'),
+  ('_colorize',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\_colorize.py',
+   'PYMODULE'),
+  ('_py_abc',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\_py_abc.py',
+   'PYMODULE'),
   ('wx.media',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\media.py',
    'PYMODULE'),
@@ -670,6 +658,18 @@
    'PYMODULE'),
   ('_threading_local',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\_threading_local.py',
+   'PYMODULE'),
+  ('json',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\json\\__init__.py',
+   'PYMODULE'),
+  ('json.encoder',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\json\\encoder.py',
+   'PYMODULE'),
+  ('json.decoder',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\json\\decoder.py',
+   'PYMODULE'),
+  ('json.scanner',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\json\\scanner.py',
    'PYMODULE')],
  [('python313.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\python313.dll',
@@ -749,82 +749,34 @@
   ('wx\\wxmsw32u_core_vc140_x64.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxmsw32u_core_vc140_x64.dll',
    'BINARY'),
-  ('wx\\wxbase32u_vc140_x64.dll',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxbase32u_vc140_x64.dll',
-   'BINARY'),
   ('VCRUNTIME140_1.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\VCRUNTIME140_1.dll',
    'BINARY'),
+  ('wx\\wxbase32u_vc140_x64.dll',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxbase32u_vc140_x64.dll',
+   'BINARY'),
   ('wx\\wxmsw32u_media_vc140_x64.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxmsw32u_media_vc140_x64.dll',
    'BINARY'),
   ('wx\\wxmsw32u_html_vc140_x64.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxmsw32u_html_vc140_x64.dll',
    'BINARY'),
-  ('MSVCP140.dll', 'C:\\Windows\\System32\\MSVCP140.dll', 'BINARY'),
   ('wx\\wxbase32u_net_vc140_x64.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxbase32u_net_vc140_x64.dll',
-   'BINARY')],
+   'BINARY'),
+  ('MSVCP140.dll', 'C:\\Windows\\System32\\MSVCP140.dll', 'BINARY')],
  [],
  [],
  [('base_library.zip', 'D:\\audio\\build\\main\\base_library.zip', 'DATA')],
- [('posixpath',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\posixpath.py',
+ [('io',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\io.py',
    'PYMODULE'),
-  ('copyreg',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\copyreg.py',
-   'PYMODULE'),
-  ('reprlib',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\reprlib.py',
-   'PYMODULE'),
-  ('linecache',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\linecache.py',
-   'PYMODULE'),
-  ('sre_constants',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\sre_constants.py',
-   'PYMODULE'),
-  ('_collections_abc',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\_collections_abc.py',
+  ('operator',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\operator.py',
    'PYMODULE'),
   ('types',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\types.py',
    'PYMODULE'),
-  ('genericpath',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\genericpath.py',
-   'PYMODULE'),
-  ('traceback',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\traceback.py',
-   'PYMODULE'),
-  ('codecs',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\codecs.py',
-   'PYMODULE'),
-  ('_weakrefset',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\_weakrefset.py',
-   'PYMODULE'),
-  ('ntpath',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\ntpath.py',
-   'PYMODULE'),
-  ('io',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\io.py',
-   'PYMODULE'),
-  ('abc',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\abc.py',
-   'PYMODULE'),
-  ('functools',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\functools.py',
-   'PYMODULE'),
-  ('locale',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\locale.py',
-   'PYMODULE'),
-  ('collections.abc',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\collections\\abc.py',
-   'PYMODULE'),
-  ('collections',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\collections\\__init__.py',
-   'PYMODULE'),
-  ('sre_parse',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\sre_parse.py',
-   'PYMODULE'),
   ('encodings.zlib_codec',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\encodings\\zlib_codec.py',
    'PYMODULE'),
@@ -1191,18 +1143,51 @@
   ('encodings',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\encodings\\__init__.py',
    'PYMODULE'),
-  ('sre_compile',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\sre_compile.py',
+  ('sre_constants',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\sre_constants.py',
    'PYMODULE'),
-  ('weakref',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\weakref.py',
+  ('collections.abc',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\collections\\abc.py',
    'PYMODULE'),
-  ('heapq',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\heapq.py',
+  ('collections',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\collections\\__init__.py',
+   'PYMODULE'),
+  ('keyword',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\keyword.py',
+   'PYMODULE'),
+  ('genericpath',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\genericpath.py',
    'PYMODULE'),
   ('enum',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\enum.py',
    'PYMODULE'),
+  ('reprlib',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\reprlib.py',
+   'PYMODULE'),
+  ('_collections_abc',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\_collections_abc.py',
+   'PYMODULE'),
+  ('warnings',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\warnings.py',
+   'PYMODULE'),
+  ('linecache',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\linecache.py',
+   'PYMODULE'),
+  ('posixpath',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\posixpath.py',
+   'PYMODULE'),
+  ('functools',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\functools.py',
+   'PYMODULE'),
+  ('codecs',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\codecs.py',
+   'PYMODULE'),
+  ('copyreg',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\copyreg.py',
+   'PYMODULE'),
+  ('traceback',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\traceback.py',
+   'PYMODULE'),
   ('re._parser',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\re\\_parser.py',
    'PYMODULE'),
@@ -1218,17 +1203,32 @@
   ('re',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\re\\__init__.py',
    'PYMODULE'),
-  ('keyword',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\keyword.py',
+  ('_weakrefset',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\_weakrefset.py',
+   'PYMODULE'),
+  ('abc',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\abc.py',
+   'PYMODULE'),
+  ('locale',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\locale.py',
+   'PYMODULE'),
+  ('weakref',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\weakref.py',
    'PYMODULE'),
   ('stat',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\stat.py',
    'PYMODULE'),
-  ('operator',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\operator.py',
+  ('ntpath',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\ntpath.py',
    'PYMODULE'),
-  ('warnings',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\warnings.py',
+  ('sre_parse',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\sre_parse.py',
+   'PYMODULE'),
+  ('sre_compile',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\sre_compile.py',
+   'PYMODULE'),
+  ('heapq',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\heapq.py',
    'PYMODULE'),
   ('os',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\os.py',
diff --git a/build/main/EXE-00.toc b/build/main/EXE-00.toc
index ea3ffa1..33c1106 100644
--- a/build/main/EXE-00.toc
+++ b/build/main/EXE-00.toc
@@ -136,27 +136,27 @@
   ('wx\\wxmsw32u_core_vc140_x64.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxmsw32u_core_vc140_x64.dll',
    'BINARY'),
-  ('wx\\wxbase32u_vc140_x64.dll',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxbase32u_vc140_x64.dll',
-   'BINARY'),
   ('VCRUNTIME140_1.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\VCRUNTIME140_1.dll',
    'BINARY'),
+  ('wx\\wxbase32u_vc140_x64.dll',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxbase32u_vc140_x64.dll',
+   'BINARY'),
   ('wx\\wxmsw32u_media_vc140_x64.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxmsw32u_media_vc140_x64.dll',
    'BINARY'),
   ('wx\\wxmsw32u_html_vc140_x64.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxmsw32u_html_vc140_x64.dll',
    'BINARY'),
-  ('MSVCP140.dll', 'C:\\Windows\\System32\\MSVCP140.dll', 'BINARY'),
   ('wx\\wxbase32u_net_vc140_x64.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxbase32u_net_vc140_x64.dll',
    'BINARY'),
+  ('MSVCP140.dll', 'C:\\Windows\\System32\\MSVCP140.dll', 'BINARY'),
   ('base_library.zip', 'D:\\audio\\build\\main\\base_library.zip', 'DATA')],
  [],
  False,
  False,
- 1770832619,
+ 1770922631,
  [('run.exe',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\PyInstaller\\bootloader\\Windows-64bit-intel\\run.exe',
    'EXECUTABLE')],
diff --git a/build/main/PKG-00.toc b/build/main/PKG-00.toc
index 235ee59..c0ae411 100644
--- a/build/main/PKG-00.toc
+++ b/build/main/PKG-00.toc
@@ -114,22 +114,22 @@
   ('wx\\wxmsw32u_core_vc140_x64.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxmsw32u_core_vc140_x64.dll',
    'BINARY'),
-  ('wx\\wxbase32u_vc140_x64.dll',
-   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxbase32u_vc140_x64.dll',
-   'BINARY'),
   ('VCRUNTIME140_1.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\VCRUNTIME140_1.dll',
    'BINARY'),
+  ('wx\\wxbase32u_vc140_x64.dll',
+   'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxbase32u_vc140_x64.dll',
+   'BINARY'),
   ('wx\\wxmsw32u_media_vc140_x64.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxmsw32u_media_vc140_x64.dll',
    'BINARY'),
   ('wx\\wxmsw32u_html_vc140_x64.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxmsw32u_html_vc140_x64.dll',
    'BINARY'),
-  ('MSVCP140.dll', 'C:\\Windows\\System32\\MSVCP140.dll', 'BINARY'),
   ('wx\\wxbase32u_net_vc140_x64.dll',
    'C:\\Users\\aaron\\AppData\\Local\\Programs\\Python\\Python313\\Lib\\site-packages\\wx\\wxbase32u_net_vc140_x64.dll',
    'BINARY'),
+  ('MSVCP140.dll', 'C:\\Windows\\System32\\MSVCP140.dll', 'BINARY'),
   ('base_library.zip', 'D:\\audio\\build\\main\\base_library.zip', 'DATA')],
  'python313.dll',
  False,
diff --git a/build/main/base_library.zip b/build/main/base_library.zip
index 4b4bf8c..d0689c0 100644
Binary files a/build/main/base_library.zip and b/build/main/base_library.zip differ
diff --git a/build/main/main.pkg b/build/main/main.pkg
index 62c5f5b..5a0f730 100644
Binary files a/build/main/main.pkg and b/build/main/main.pkg differ
diff --git a/build/main/xref-main.html b/build/main/xref-main.html
index e99529c..2dd644d 100644
--- a/build/main/xref-main.html
+++ b/build/main/xref-main.html
@@ -152,6 +152,7 @@ imports:
  &#8226;   <a href="#genericpath">genericpath</a>
  &#8226;   <a href="#heapq">heapq</a>
  &#8226;   <a href="#io">io</a>
+ &#8226;   <a href="#json">json</a>
  &#8226;   <a href="#keyword">keyword</a>
  &#8226;   <a href="#linecache">linecache</a>
  &#8226;   <a href="#locale">locale</a>
@@ -7206,6 +7207,7 @@ imported by:
  &#8226;   <a href="#json.decoder">json.decoder</a>
  &#8226;   <a href="#json.encoder">json.encoder</a>
  &#8226;   <a href="#json.scanner">json.scanner</a>
+ &#8226;   <a href="#main.py">main.py</a>
 
   </div>
 
diff --git a/dist/main.exe b/dist/main.exe
index da3f3a5..5d00521 100644
Binary files a/dist/main.exe and b/dist/main.exe differ
diff --git a/main.py b/main.py
index 4a114f2..1d03de2 100644
--- a/main.py
+++ b/main.py
@@ -6,7 +6,7 @@ import subprocess
 import wx
 import wx.media
 
-AUDIO_FORMATS = ["mp3", "wav", "aac", "flac", "ogg", "m4a"]
+AUDIO_FORMATS = ["mp3", "wav", "aac", "flac", "ogg", "m4a", "m4b"]
 VIDEO_FORMATS = ["mp4", "mkv", "mov", "webm"]
 
 
@@ -41,6 +41,10 @@ class ConverterFrame(wx.Frame):
         self.log_ctrl = wx.TextCtrl(panel, style=wx.TE_MULTILINE | wx.TE_READONLY)
         self.status = wx.StaticText(panel, label="Ready")
         self.status.SetForegroundColour(label_color)
+        self.progress_gauge = wx.Gauge(panel, range=1000, style=wx.GA_HORIZONTAL)
+        self.progress_gauge.SetValue(0)
+        self.progress_label = wx.StaticText(panel, label="Progress")
+        self.progress_label.SetForegroundColour(label_color)
 
         self.media = wx.media.MediaCtrl(panel, style=wx.SIMPLE_BORDER)
         self.play_btn = wx.Button(panel, label="&Play/Pause")
@@ -101,6 +105,8 @@ class ConverterFrame(wx.Frame):
         main.Add(form, 0, wx.EXPAND | wx.ALL, 10)
         main.Add(self.start_btn, 0, wx.LEFT | wx.RIGHT | wx.BOTTOM, 10)
         main.Add(self.build_player(panel), 0, wx.EXPAND | wx.LEFT | wx.RIGHT | wx.BOTTOM, 10)
+        main.Add(self.progress_label, 0, wx.LEFT | wx.RIGHT | wx.BOTTOM, 4)
+        main.Add(self.progress_gauge, 0, wx.EXPAND | wx.LEFT | wx.RIGHT | wx.BOTTOM, 10)
         main.Add(self.log_ctrl, 1, wx.EXPAND | wx.LEFT | wx.RIGHT, 10)
         main.Add(self.status, 0, wx.LEFT | wx.RIGHT | wx.BOTTOM, 10)
 
@@ -356,6 +362,7 @@ class ConverterFrame(wx.Frame):
         self.log_ctrl.Clear()
         self.status.SetLabel("Running...")
         self.start_btn.Disable()
+        self.reset_progress()
 
         thread = threading.Thread(target=self.run_ffmpeg, args=(in_path, out_path), daemon=True)
         thread.start()
@@ -370,9 +377,20 @@ class ConverterFrame(wx.Frame):
         output_format = self.format_choice.GetStringSelection().lower()
         should_split_mp3 = split_mp3 and output_format == "mp3"
 
+        duration = self.get_media_duration(in_path)
+        self.prepare_progress(duration)
+
         cmd = ["ffmpeg", "-y"]
+        cmd += ["-progress", "pipe:1", "-nostats"]
         if activation_bytes:
             cmd += ["-activation_bytes", activation_bytes]
+        aaxc_key, aaxc_iv = self.get_aaxc_key_iv(in_path)
+        if aaxc_key and aaxc_iv:
+            cmd += ["-audible_key", aaxc_key, "-audible_iv", aaxc_iv]
+        elif os.path.splitext(in_path)[1].lower() == ".aaxc":
+            self.append_log("Missing or invalid .voucher key/iv for .aaxc file.")
+            self.finish("Failed")
+            return
         cmd += ["-i", in_path]
 
         if mode == "Audio":
@@ -423,9 +441,14 @@ class ConverterFrame(wx.Frame):
                 universal_newlines=True,
             )
             for line in proc.stdout:
-                self.append_log(line.rstrip())
+                line = line.rstrip()
+                if self.handle_progress_line(line, duration):
+                    continue
+                if line:
+                    self.append_log(line)
             proc.wait()
             if proc.returncode == 0:
+                self.set_progress_complete()
                 self.finish("Done")
             else:
                 self.finish("Failed")
@@ -440,6 +463,114 @@ class ConverterFrame(wx.Frame):
         wx.CallAfter(self.status.SetLabel, status_text)
         wx.CallAfter(self.start_btn.Enable)
 
+    def reset_progress(self):
+        self.progress_gauge.SetRange(1000)
+        self.progress_gauge.SetValue(0)
+
+    def prepare_progress(self, duration_seconds):
+        if duration_seconds and duration_seconds > 0:
+            wx.CallAfter(self.progress_gauge.SetRange, 1000)
+            wx.CallAfter(self.progress_gauge.SetValue, 0)
+        else:
+            wx.CallAfter(self.progress_gauge.Pulse)
+
+    def set_progress_value(self, ratio):
+        ratio = max(0.0, min(1.0, ratio))
+        value = int(ratio * 1000)
+        wx.CallAfter(self.progress_gauge.SetValue, value)
+
+    def set_progress_complete(self):
+        wx.CallAfter(self.progress_gauge.SetValue, 1000)
+
+    def handle_progress_line(self, line, duration_seconds):
+        if not line:
+            return False
+        if line.startswith("out_time_ms="):
+            if duration_seconds and duration_seconds > 0:
+                try:
+                    out_ms = int(line.split("=", 1)[1].strip())
+                    ratio = out_ms / (duration_seconds * 1_000_000)
+                    self.set_progress_value(ratio)
+                except (ValueError, ZeroDivisionError):
+                    pass
+            else:
+                wx.CallAfter(self.progress_gauge.Pulse)
+            return True
+        if line.startswith("progress="):
+            if line.split("=", 1)[1].strip() == "end":
+                self.set_progress_complete()
+            return True
+        return False
+
+    def get_media_duration(self, in_path):
+        if not shutil.which("ffprobe"):
+            return 0
+        cmd = [
+            "ffprobe",
+            "-v",
+            "error",
+            "-show_entries",
+            "format=duration",
+            "-of",
+            "default=nk=1:nw=1",
+            in_path,
+        ]
+        try:
+            proc = subprocess.run(
+                cmd,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.STDOUT,
+                text=True,
+                check=False,
+            )
+            if proc.returncode != 0:
+                return 0
+            value = (proc.stdout or "").strip()
+            return float(value) if value else 0
+        except Exception:
+            return 0
+
+    def get_aaxc_key_iv(self, in_path):
+        if os.path.splitext(in_path)[1].lower() != ".aaxc":
+            return None, None
+        voucher_path = os.path.splitext(in_path)[0] + ".voucher"
+        if not os.path.isfile(voucher_path):
+            return None, None
+        try:
+            with open(voucher_path, "r", encoding="utf-8") as handle:
+                data = json.load(handle)
+        except Exception:
+            return None, None
+        if not isinstance(data, dict):
+            return None, None
+
+        # Support multiple voucher shapes:
+        # - content_license.license_response (current Audible export shape)
+        # - lilicense_response (legacy/typo compatibility)
+        # - license_response (flat shape fallback)
+        license_resp = None
+        content_license = data.get("content_license")
+        if isinstance(content_license, dict):
+            candidate = content_license.get("license_response")
+            if isinstance(candidate, dict):
+                license_resp = candidate
+        if license_resp is None:
+            candidate = data.get("lilicense_response")
+            if isinstance(candidate, dict):
+                license_resp = candidate
+        if license_resp is None:
+            candidate = data.get("license_response")
+            if isinstance(candidate, dict):
+                license_resp = candidate
+        if not isinstance(license_resp, dict):
+            return None, None
+
+        key = license_resp.get("key")
+        iv = license_resp.get("iv")
+        if not key or not iv:
+            return None, None
+        return str(key), str(iv)
+
     def build_capture_output_pattern(self, out_path):
         base, ext = os.path.splitext(out_path)
         return f"{base}_capture_%03d{ext}"