Upd yt video router and chunker

app.py

@@ -214,7 +214,7 @@ def _return_yt_html_embed(yt_url):
     )
     return HTML_str
 
-def download_yt_audio(yt_url, filename):
+def download_yt_audio(yt_url, filename, cookies_txt: str | None = None):
     info_loader = youtube_dl.YoutubeDL()
     
     try:
@@ -237,21 +237,41 @@ def download_yt_audio(yt_url, filename):
         file_length_hms = time.strftime("%HH:%MM:%SS", time.gmtime(file_length_s))
         raise gr.Error(f"Maximum YouTube length is {yt_length_limit_hms}, got {file_length_hms} YouTube video.")
     
-    ydl_opts = {"outtmpl": filename, "format": "worstvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best"}
+    ydl_opts = {
+        "outtmpl": filename,
+        "format": "bestaudio/best",
+        "quiet": True,
+        "noplaylist": True,
+        "retries": 3,
+    }
+    cookie_path = None
+    if cookies_txt and cookies_txt.strip():
+        tf = tempfile.NamedTemporaryFile(mode="w", suffix=".txt", delete=False)
+        tf.write(cookies_txt)
+        tf.close()
+        cookie_path = tf.name
+        ydl_opts["cookiefile"] = cookie_path
     
-    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
-        try:
-            ydl.download([yt_url])
-        except youtube_dl.utils.ExtractorError as err:
-            raise gr.Error(str(err))
+    try:
+        with youtube_dl.YoutubeDL(ydl_opts) as ydl:
+            try:
+                ydl.download([yt_url])
+            except youtube_dl.utils.ExtractorError as err:
+                raise gr.Error(str(err))
+    finally:
+        if cookie_path and os.path.exists(cookie_path):
+            os.unlink(cookie_path)
 
 @spaces.GPU(duration=120)
-def yt_transcribe(yt_url, task, summarize=False, max_filesize=75.0):
+def yt_transcribe(yt_url, task, summarize=False, cookies_txt=None, max_filesize=75.0):
     html_embed_str = _return_yt_html_embed(yt_url)
 
     with tempfile.TemporaryDirectory() as tmpdirname:
         filepath = os.path.join(tmpdirname, "video.mp4")
-        download_yt_audio(yt_url, filepath)
+        try:
+            download_yt_audio(yt_url, filepath, cookies_txt=cookies_txt)
+        except gr.Error as e:
+            raise gr.Error(str(e) + "\n\nTip: Provide exported YouTube cookies (Netscape format) in the optional cookies box if the video requires sign-in or captcha.")
         with open(filepath, "rb") as f:
             inputs = f.read()
 
@@ -329,6 +349,7 @@ yt_transcribe = gr.Interface(
         gr.Textbox(lines=1, placeholder="Paste the URL to a YouTube video here", label="YouTube URL"),
         gr.Radio(["transcribe", "translate"], label="Task", value="transcribe"),
         gr.Checkbox(label="Summarize with Gemini", value=False),
+        gr.Textbox(lines=4, placeholder="Optional: paste exported YouTube cookies in Netscape format here if the video requires sign-in.", label="YouTube cookies (optional)"),
     ],
     outputs=[
         "html",