diff --git a/config.py b/config.py
index 035b8ea..2eb48e7 100644
--- a/config.py
+++ b/config.py
@@ -8,7 +8,7 @@ DANMAKU_FACTORY_EXEC = "DanmakuFactory"
 # speed
 DANMAKU_SPEED = 12
 # font
-DEFAULT_FONT_NAME = "Sarasa Term SC"
+DANMAKU_FONT_NAME = "Sarasa Term SC"
 # font_size
 DANMAKU_FONT_SIZE = 40
 # resolution
@@ -22,6 +22,8 @@ FFMPEG_USE_HEVC = False
 FFMPEG_USE_NVIDIA_GPU = False
 # intel_gpu
 FFMPEG_USE_INTEL_GPU = False
+# vaapi
+FFMPEG_USE_VAAPI = False
 # bitrate
 VIDEO_BITRATE = "2.5M"
 # crf
@@ -66,10 +68,10 @@ def load_config():
     config.read("config.ini", encoding="utf-8")
     if config.has_section("danmaku"):
         section = config['danmaku']
-        global DANMAKU_FACTORY_EXEC, DANMAKU_SPEED, DEFAULT_FONT_NAME, VIDEO_RESOLUTION, DANMAKU_FONT_SIZE
+        global DANMAKU_FACTORY_EXEC, DANMAKU_SPEED, DANMAKU_FONT_NAME, VIDEO_RESOLUTION, DANMAKU_FONT_SIZE
         DANMAKU_FACTORY_EXEC = section.get('exec', DANMAKU_FACTORY_EXEC)
         DANMAKU_SPEED = section.getfloat('speed', DANMAKU_SPEED)
-        DEFAULT_FONT_NAME = section.get('font', DEFAULT_FONT_NAME)
+        DANMAKU_FONT_NAME = section.get('font', DANMAKU_FONT_NAME)
         DANMAKU_FONT_SIZE = section.getint('font_size', DANMAKU_FONT_SIZE)
         VIDEO_RESOLUTION = section.get('resolution', VIDEO_RESOLUTION)
     if config.has_section("video"):
@@ -88,11 +90,12 @@ def load_config():
     if config.has_section("ffmpeg"):
         section = config['ffmpeg']
         global FFMPEG_EXEC, FFMPEG_USE_HEVC, FFMPEG_USE_NVIDIA_GPU, FFMPEG_USE_INTEL_GPU, VIDEO_BITRATE, VIDEO_CRF, \
-            VIDEO_GOP
+            VIDEO_GOP, FFMPEG_USE_VAAPI
         FFMPEG_EXEC = section.get('exec', FFMPEG_EXEC)
         FFMPEG_USE_HEVC = section.getboolean('hevc', FFMPEG_USE_HEVC)
         FFMPEG_USE_NVIDIA_GPU = section.getboolean('nvidia_gpu', FFMPEG_USE_NVIDIA_GPU)
         FFMPEG_USE_INTEL_GPU = section.getboolean('intel_gpu', FFMPEG_USE_INTEL_GPU)
+        FFMPEG_USE_VAAPI = section.getboolean('vaapi', FFMPEG_USE_VAAPI)
         VIDEO_BITRATE = section.get('bitrate', VIDEO_BITRATE)
         VIDEO_CRF = section.getfloat('crf', VIDEO_CRF)
         VIDEO_GOP = section.getfloat('gop', VIDEO_GOP)
@@ -110,7 +113,7 @@ def get_config():
         'danmaku': {
             'exec': DANMAKU_FACTORY_EXEC,
             'speed': DANMAKU_SPEED,
-            'font': DEFAULT_FONT_NAME,
+            'font': DANMAKU_FONT_NAME,
             'font_size': DANMAKU_FONT_SIZE,
             'resolution': VIDEO_RESOLUTION,
         },
@@ -130,6 +133,7 @@ def get_config():
             'hevc': FFMPEG_USE_HEVC,
             'nvidia_gpu': FFMPEG_USE_NVIDIA_GPU,
             'intel_gpu': FFMPEG_USE_INTEL_GPU,
+            'vaapi': FFMPEG_USE_VAAPI,
             'bitrate': VIDEO_BITRATE,
             'crf': VIDEO_CRF,
             'gop': VIDEO_GOP,
diff --git a/danmaku_workflow.py b/danmaku_workflow.py
index 783ab7a..0c2a761 100644
--- a/danmaku_workflow.py
+++ b/danmaku_workflow.py
@@ -3,7 +3,6 @@ import os.path
 import platform
 import subprocess
 import sys
-import threading
 import traceback
 from hashlib import md5
 from typing import Optional, IO, Union
@@ -15,8 +14,8 @@ from PyQt5.QtWidgets import QWidget, QLabel, QApplication, QFrame, QVBoxLayout,
     QSizePolicy, QMessageBox
 from danmaku_xml_helper import get_file_start, diff_danmaku_files, NoDanmakuException
 from config import load_config, FFMPEG_EXEC, DANMAKU_FACTORY_EXEC, FFMPEG_USE_INTEL_GPU, FFMPEG_USE_NVIDIA_GPU, \
-    VIDEO_BITRATE, VIDEO_CLIP_EACH_SEC, VIDEO_CLIP_OVERFLOW_SEC, VIDEO_RESOLUTION, DANMAKU_SPEED, DEFAULT_FONT_NAME, \
-    VIDEO_OUTPUT_DIR, VIDEO_CRF, VIDEO_GOP, FFMPEG_USE_HEVC
+    VIDEO_BITRATE, VIDEO_CLIP_EACH_SEC, VIDEO_CLIP_OVERFLOW_SEC, VIDEO_RESOLUTION, DANMAKU_SPEED, DANMAKU_FONT_NAME, \
+    VIDEO_OUTPUT_DIR, VIDEO_CRF, VIDEO_GOP, FFMPEG_USE_HEVC, DANMAKU_FONT_SIZE
 
 
 class Job:
@@ -304,11 +303,10 @@ class WorkerThread(QThread):
         # 压制
         files_need_split = self.encode_video_with_subtitles(job.video, job.subtitles, base_start_ts)
         for _f in files_need_split:
-            self.quick_split_video(_f)
-        for _f in job.subtitles:
-            if os.path.isfile(_f):
+            need_delete = self.quick_split_video(_f)
+            if need_delete:
                 os.remove(_f)
-        for _f in files_need_split:
+        for _f in job.subtitles:
             if os.path.isfile(_f):
                 os.remove(_f)
 
@@ -343,7 +341,7 @@ class WorkerThread(QThread):
         current_sec = 0
         if duration < VIDEO_CLIP_EACH_SEC:
             print("[-]Less than each sec, skip")
-            return
+            return False
         while current_sec < duration:
             if (current_sec + VIDEO_CLIP_OVERFLOW_SEC * 2) > duration:
                 print("[-]Less than 2 overflow sec, skip")
@@ -362,6 +360,7 @@ class WorkerThread(QThread):
             self.handle_ffmpeg_output(split_process.stdout)
             split_process.wait()
             current_sec += VIDEO_CLIP_EACH_SEC
+        return True
 
     def handle_ffmpeg_output(self, stdout: Optional[IO[bytes]]) -> str:
         out_time = "0:0:0.0"
@@ -406,7 +405,7 @@ def danmaku_to_subtitle(file: Union[os.PathLike[str], str], time_shift: float):
     process = subprocess.Popen((
         DANMAKU_FACTORY_EXEC, "--ignore-warnings",
         "-r", str(VIDEO_RESOLUTION), "-s", str(DANMAKU_SPEED), "-f", "5",
-        "-S", "40", "-N", str(DEFAULT_FONT_NAME), "--showmsgbox", "FALSE",
+        "-S", str(DANMAKU_FONT_SIZE), "-N", str(DANMAKU_FONT_NAME), "--showmsgbox", "FALSE",
         "-O", "255", "-L", "1", "-D", "0",
         "-o", "ass", new_subtitle_name, "-i", file, "-t", str(time_shift)
     ), **subprocess_args(True))
diff --git a/danmaku_xml_helper.py b/danmaku_xml_helper.py
index fb82b79..a61815b 100644
--- a/danmaku_xml_helper.py
+++ b/danmaku_xml_helper.py
@@ -5,7 +5,7 @@ from typing import Union
 
 from bs4 import BeautifulSoup
 
-from config import DANMAKU_FACTORY_EXEC, VIDEO_RESOLUTION, DANMAKU_SPEED, DEFAULT_FONT_NAME
+from config import DANMAKU_FACTORY_EXEC, VIDEO_RESOLUTION, DANMAKU_SPEED, DANMAKU_FONT_NAME
 
 
 class NoDanmakuException(Exception):