diff --git a/HLSDownloader.exe b/HLSDownloader.exe
new file mode 100644
index 0000000..3edebfe
--- /dev/null
+++ b/HLSDownloader.exe
Binary files differ
diff --git a/main_windows.py b/main_windows.py
index f286610..3503163 100644
--- a/main_windows.py
+++ b/main_windows.py
@@ -147,7 +147,7 @@
 
     name_prefix += folder_name.rstrip() + "/"
     # Remove illegal characters for Windows filenames
-    name_prefix = re.sub(r'[<>:"\\|?*]', '_', name_prefix)
+    name_prefix = re.sub(r'[<>:"\\|?*\xa0]', '_', name_prefix)
 
     if args.lesson_name_filter is not None:
         lesson_data['data']['activities'] = [l for l in lesson_data['data']['activities'] if
@@ -190,7 +190,7 @@
 
     name_prefix += "-" + lesson['title'].rstrip()
     # Remove illegal characters for Windows filenames
-    name_prefix = re.sub(r'[<>:"\\|?*]', '_', name_prefix)
+    name_prefix = re.sub(r'[<>:"\\|?*\xa0]', '_', name_prefix)
 
     if 'live' not in lesson_video_data['data']:
         print(f"v3 protocol detection failed, falling back to v1")
@@ -252,7 +252,7 @@
     name_prefix += "-" + lesson['title'].rstrip()
 
     # Remove illegal characters for Windows filenames
-    name_prefix = re.sub(r'[<>:"\\|?*]', '_', name_prefix)
+    name_prefix = re.sub(r'[<>:"\\|?*\xa0]', '_', name_prefix)
 
     if 'presentations' not in lesson_data['data']:
         print(f"v3 protocol detection failed, falling back to v1")
diff --git a/ppt_processing.py b/ppt_processing.py
index 747bbe4..d2ad2bc 100644
--- a/ppt_processing.py
+++ b/ppt_processing.py
@@ -13,7 +13,7 @@
         name_prefix += "-" + ppt_raw_data['data']['presentation']['title'].rstrip()
 
     # Remove illegal characters for Windows filenames
-    name_prefix = re.sub(r'[<>:"\\|?*]', '_', name_prefix)
+    name_prefix = re.sub(r'[<>:"\\|?*\xa0]', '_', name_prefix)
 
     # If PDF is present, skip
     if os.path.exists(f"{DOWNLOAD_FOLDER}/{name_prefix}.pdf"):
diff --git a/scrap_example.txt b/scrap_example.txt
index dd58816..656ad98 100644
--- a/scrap_example.txt
+++ b/scrap_example.txt
@@ -160,7 +160,7 @@
 #         "user": {
 #             "identityId": "21640720",
 #             "avatar": "http://qn-sx.yuketang.cn/tougao_pic_AFzVVZcN5p9.png",
-#             "name": "董业恺",
+#             "name": "[REDACTED]",
 #             "number": "2022010426"
 #         },
 #         "activityId": "7970721",
diff --git a/video_processing.py b/video_processing.py
index 5efbb2c..5d9f89c 100644
--- a/video_processing.py
+++ b/video_processing.py
@@ -16,11 +16,43 @@
 
     print(f"Downloading {name_prefix} - {order}")
 
-    video_download_command = (f".\\ffmpeg -i '{url}' -c copy -n '{CACHE_FOLDER}/{name_prefix}-{order}.mp4'"
-                              f" -hide_banner -loglevel error -stats")
+    # video_download_command = (f".\\ffmpeg -i '{url}' -c copy -n '{CACHE_FOLDER}/{name_prefix}-{order}.mp4'"
+    #                           f" -hide_banner -loglevel error -stats")
+
+    video_download_command = (f".\\HLSDownloader -u '{url}' -o '{CACHE_FOLDER}/{name_prefix}-{order}.mp4'"
+                              f" -w 32 -workers 32 ")
 
     result = subprocess.run(['powershell', '-Command', video_download_command], text=True)
 
+    # Check if HLSDownloader succeeded
+    if result.returncode != 0:
+        print(f"HLSDownloader failed for {name_prefix} - {order}. Attempting fallback with reduced workers.")
+
+        # Second attempt with HLSDownloader using 8 workers
+        video_download_command_mid = (f".\\HLSDownloader -u '{url}' -o '{CACHE_FOLDER}/{name_prefix}-{order}.mp4' "
+                                      f"-w 8 -workers 8")
+
+        mid_result = subprocess.run(['powershell', '-Command', video_download_command_mid], text=True)
+
+        # Check if the second attempt succeeded
+        if mid_result.returncode != 0:
+            print(f"Reduced workers HLSDownloader failed for {name_prefix} - {order}. Attempting fallback with ffmpeg.")
+
+            # Fallback to ffmpeg
+            ffmpeg_command = (f".\\ffmpeg -i '{url}' -c copy -n '{CACHE_FOLDER}/{name_prefix}-{order}.mp4' "
+                              f"-hide_banner -loglevel error -stats")
+
+            fallback_result = subprocess.run(['powershell', '-Command', ffmpeg_command], text=True)
+
+            if fallback_result.returncode == 0:
+                print(f"Successfully downloaded {name_prefix} - {order} using ffmpeg.")
+            else:
+                print(f"Failed to download {name_prefix} - {order} using both methods.")
+        else:
+            print(f"Successfully downloaded {name_prefix} - {order} using HLSDownloader with reduced workers.")
+    else:
+        print(f"Successfully downloaded {name_prefix} - {order} using HLSDownloader.")
+
     return result
 
 
@@ -94,6 +126,6 @@
         f"-i '{CACHE_FOLDER}/concat.txt' "
         f"-c:v hevc_nvenc -cq 28 -surfaces 64 -bufsize 12800k -r 7.5 -rc-lookahead 63 "
         f"-c:a aac -ac 1 -rematrix_maxval 1.0 -b:a 64k '{DOWNLOAD_FOLDER}/{name_prefix}.mp4' -n "
-        f"-hide_banner -loglevel warning -stats")
+        f"-hide_banner -loglevel error -stats")
 
     subprocess.run(['powershell', '-Command', video_concatenating_command], text=True)
\ No newline at end of file