diff --git a/Video_Killed_The_Radio_Star_Defusion.ipynb b/Video_Killed_The_Radio_Star_Defusion.ipynb
index 34efa00..3bb1173 100644
--- a/Video_Killed_The_Radio_Star_Defusion.ipynb
+++ b/Video_Killed_The_Radio_Star_Defusion.ipynb
@@ -150,7 +150,7 @@
         "# @title # 2. 📋 Audio processing parameters\n",
         "\n",
         "import datetime as dt\n",
-        "\n",
+        "from itertools import chain, cycle\n",
         "import json\n",
         "import os\n",
         "from pathlib import Path\n",
@@ -161,25 +161,15 @@
         "import time\n",
         "import warnings\n",
         "\n",
-        "import tokenizations\n",
-        "import webvtt\n",
-        "\n",
         "from IPython.display import display\n",
+        "from omegaconf import OmegaConf\n",
         "import numpy as np\n",
-        "\n",
-        "\n",
-        "from itertools import chain, cycle\n",
-        "\n",
         "from tqdm.autonotebook import tqdm\n",
         "\n",
-        "from vktrs.youtube import (\n",
-        "    YoutubeHelper,\n",
-        "    parse_timestamp,\n",
-        "    vtt_to_token_timestamps,\n",
-        "    srv2_to_token_timestamps,\n",
-        ")\n",
+        "import tokenizations\n",
+        "import webvtt\n",
+        "\n",
         "\n",
-        "from omegaconf import OmegaConf\n",
         "# to do: use project name to name file\n",
         "# to do: separate global params defined here from the storyboard object.\n",
         "#        users will not anticipate that updates here will destroy their work\n",
@@ -234,6 +224,13 @@
         "\n",
         "# @title # 3. 📥 Download audio from youtube\n",
         "\n",
+        "from vktrs.youtube import (\n",
+        "    YoutubeHelper,\n",
+        "    parse_timestamp,\n",
+        "    vtt_to_token_timestamps,\n",
+        "    srv2_to_token_timestamps,\n",
+        ")\n",
+        "\n",
         "storyboard_fname = 'storyboard.yaml'\n",
         "storyboard = OmegaConf.load(storyboard_fname)\n",
         "\n",
@@ -244,6 +241,10 @@
         "    if storyboard.params.get('audio_fpath') is None:\n",
         "        helper = YoutubeHelper(video_url)\n",
         "\n",
+        "        # estimate video end\n",
+        "        video_duration = dt.timedelta(seconds=helper.info['duration'])\n",
+        "        storyboard.params['video_duration'] = video_duration.total_seconds()\n",
+        "\n",
         "        input_audio = helper.info['requested_downloads'][-1]['filepath']\n",
         "        !ffmpeg -y -i \"{input_audio}\" -acodec libmp3lame audio.mp3\n",
         "\n",
@@ -332,7 +333,7 @@
         "ifps = dt.timedelta(seconds=1/fps)\n",
         "\n",
         "# estimate video end\n",
-        "video_duration = dt.timedelta(seconds=helper.info['duration'])\n",
+        "video_duration = storyboard.params['video_duration']\n",
         "\n",
         "# dummy prompt for last scene duration\n",
         "prompt_starts.append({'td':video_duration})\n",