diff --git a/ytdlbot/client_init.py b/ytdlbot/client_init.py
index f1635e6..5f9f901 100644
--- a/ytdlbot/client_init.py
+++ b/ytdlbot/client_init.py
@@ -11,13 +11,13 @@ import os
 
 from pyrogram import Client
 
-from config import APP_HASH, APP_ID, PYRO_WORKERS, TOKEN
+from config import APP_HASH, APP_ID, PYRO_WORKERS, TOKEN, IPv6
 
 
 def create_app(session="ytdl", workers=PYRO_WORKERS):
     _app = Client(session, APP_ID, APP_HASH,
                   bot_token=TOKEN, workers=workers,
-                  ipv6=os.getenv("IPv6", False),
+                  ipv6=IPv6,
                   # proxy={"hostname": "host.docker.internal", "port": 1080}
                   )
 
diff --git a/ytdlbot/config.py b/ytdlbot/config.py
index 2bc0f4d..5db5198 100644
--- a/ytdlbot/config.py
+++ b/ytdlbot/config.py
@@ -31,7 +31,7 @@ MULTIPLY = os.getenv("MULTIPLY", 5)  # VIP1 is 5*5-25G, VIP2 is 50G
 USD2CNY = os.getenv("USD2CNY", 6)  # $5 --> ¥30
 
 ENABLE_VIP = os.getenv("VIP", False)
-MAX_DURATION = int(os.getenv("MAX_DURATION", 0))
+MAX_DURATION = int(os.getenv("MAX_DURATION", 60))
 AFD_LINK = os.getenv("AFD_LINK", "https://afdian.net/@BennyThink")
 COFFEE_LINK = os.getenv("COFFEE_LINK", "https://www.buymeacoffee.com/bennythink")
 COFFEE_TOKEN = os.getenv("COFFEE_TOKEN")
@@ -53,3 +53,6 @@ MYSQL_PASS = os.getenv("MYSQL_PASS", "root")
 
 AUDIO_FORMAT = os.getenv("AUDIO_FORMAT", "m4a")
 ARCHIVE_ID = os.getenv("ARCHIVE_ID")
+
+IPv6 = os.getenv("IPv6", False)
+ENABLE_FFMPEG = os.getenv("ENABLE_FFMPEG", False)
diff --git a/ytdlbot/downloader.py b/ytdlbot/downloader.py
index dff3a05..9e7871d 100644
--- a/ytdlbot/downloader.py
+++ b/ytdlbot/downloader.py
@@ -25,7 +25,8 @@ import yt_dlp as ytdl
 from tqdm import tqdm
 from yt_dlp import DownloadError
 
-from config import AUDIO_FORMAT, ENABLE_VIP, MAX_DURATION, TG_MAX_SIZE
+from config import (AUDIO_FORMAT, ENABLE_FFMPEG, ENABLE_VIP, MAX_DURATION,
+                    TG_MAX_SIZE, IPv6)
 from db import Redis
 from limit import VIP
 from utils import (adjust_formats, apply_log_formatter, current_time,
@@ -135,10 +136,8 @@ def convert_to_mp4(resp: dict, bot_msg):
             mime = getattr(filetype.guess(path), "mime", "video/mp4")
             if mime in default_type:
                 if not can_convert_mp4(path, bot_msg.chat.id):
-                    logging.warning("Conversion abort for non VIP %s", bot_msg.chat.id)
-                    bot_msg._client.send_message(
-                        bot_msg.chat.id,
-                        f"You're not VIP, so you can't convert video {MAX_DURATION}s to streaming formats.")
+                    logging.warning("Conversion abort for %s", bot_msg.chat.id)
+                    bot_msg._client.send_message(bot_msg.chat.id, "Can't convert your video to streaming format.")
                     break
                 edit_text(bot_msg, f"{current_time()}: Converting {path.name} to mp4. Please wait.")
                 new_file_path = path.with_suffix(".mp4")
@@ -170,6 +169,8 @@ def run_ffmpeg(cmd_list, bm):
 
 
 def can_convert_mp4(video_path, uid):
+    if not ENABLE_FFMPEG:
+        return False
     if not ENABLE_VIP:
         return True
     video_streams = ffmpeg.probe(video_path, select_streams="v")
@@ -202,7 +203,7 @@ def ytdl_download(url, tempdir, bm) -> dict:
     adjust_formats(chat_id, url, formats)
     add_instagram_cookies(url, ydl_opts)
 
-    address = ["::", "0.0.0.0"] if os.getenv("IPv6") else [None]
+    address = ["::", "0.0.0.0"] if IPv6 else [None]
 
     for format_ in formats:
         ydl_opts["format"] = format_