diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 00000000..13782d36
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,94 @@
+name: autosub
+
+on:
+  push:
+    branches:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8]
+
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+
+      -
+        name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      -
+        name: build
+        run: |
+          set -v
+          python -m pip install --upgrade pip
+          pip install .
+          autosub -h
+
+  test:
+
+    runs-on: ubuntu-latest
+    needs: build
+
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+
+      -
+        name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.8
+
+      -
+        name: build
+        run: |
+          set -v
+          python -m pip install --upgrade pip
+          pip install .
+          autosub -h
+
+      -
+        name: pylint check
+        continue-on-error: true
+        run: |
+          set -v
+          pip install pylint
+          pylint autosub
+
+      -
+        name: prepare test environment
+        run: |
+          set -v
+          sudo apt update
+          sudo apt install -qq -y ffmpeg
+          pip install -U ffmpeg-normalize langcodes youtube-dl
+
+      -
+        name: prepare test file
+        run: |
+          set -v
+          youtube-dl --no-progress -f 134+140 FhPI5lbyz-I -o video.mp4
+          ffmpeg -hide_banner -loglevel quiet -nostats -ss 00:02:20 -i video.mp4 -to 00:02:00 test.mp4 && rm video.mp4
+
+      -
+        name: test autosub
+        timeout-minutes: 10
+        run: |
+          autosub -i test.mp4 -S en-us -D zh-cn -der -of all
+          cat 'test.en&zh-cn.srt'
+
+      -
+        uses: actions/upload-artifact@v2
+        with:
+          name: result
+          path: test*
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index e42bbef5..00000000
--- a/.travis.yml
+++ /dev/null
@@ -1,8 +0,0 @@
-language: python
-python:
-  - "3.7"
-install:
-  - pip install .
-  - pip install pylint
-script:
-  - pylint autosub
diff --git a/autosub/api_xfyun.py b/autosub/api_xfyun.py
index b33940b3..5972b1a5 100644
--- a/autosub/api_xfyun.py
+++ b/autosub/api_xfyun.py
@@ -17,8 +17,8 @@
 from time import mktime
 
 # Import third-party modules
-import websocket
 import _thread
+import websocket
 
 # Any changes to the path and your own modules
 from autosub import constants
diff --git a/autosub/cmdline_utils.py b/autosub/cmdline_utils.py
index 54c0eb85..e015360d 100644
--- a/autosub/cmdline_utils.py
+++ b/autosub/cmdline_utils.py
@@ -249,10 +249,10 @@ def validate_json_config(config_file):
         with open(config_file, encoding='utf-8') as config_fp:
             try:
                 config_dict = json.load(config_fp)
-            except ValueError:
+            except ValueError as credential_load_error:
                 raise exceptions.AutosubException(
                     _("Error: Can't decode config file \"{filename}\".").format(
-                        filename=config_file))
+                        filename=config_file)) from credential_load_error
     else:
         raise exceptions.AutosubException(
             _("Error: Config file \"{filename}\" doesn't exist.").format(
diff --git a/autosub/exceptions.py b/autosub/exceptions.py
index 8b7b626b..6b406b6b 100644
--- a/autosub/exceptions.py
+++ b/autosub/exceptions.py
@@ -20,7 +20,7 @@ class AutosubException(Exception):
     """
 
     def __init__(self, msg):
-        super(AutosubException, self).__init__(msg)
+        super().__init__(msg)
         try:
             self.msg = str(msg)
         except UnicodeEncodeError:
diff --git a/autosub/ffmpeg_utils.py b/autosub/ffmpeg_utils.py
index 9ffe446a..fe7597c5 100644
--- a/autosub/ffmpeg_utils.py
+++ b/autosub/ffmpeg_utils.py
@@ -93,10 +93,10 @@ def __call__(self, region):
         except KeyboardInterrupt:
             return None
 
-        except subprocess.CalledProcessError:
+        except subprocess.CalledProcessError as ffmpeg_exec_error:
             raise exceptions.AutosubException(
                 _("Error: ffmpeg can't split your file. "
-                  "Check your audio processing options."))
+                  "Check your audio processing options.")) from ffmpeg_exec_error
 
 
 def ffprobe_get_fps(  # pylint: disable=superfluous-parens
@@ -134,7 +134,7 @@ def ffprobe_get_fps(  # pylint: disable=superfluous-parens
             try:
                 fps = float(input_str)
                 if fps <= 0.0:
-                    raise ValueError
+                    raise ValueError  # pylint: disable=raise-missing-from
             except ValueError:
                 print(_("Use \".srt\" instead."))
                 fps = 0.0
diff --git a/autosub/sub_utils.py b/autosub/sub_utils.py
index d6d65abb..a6293a2f 100644
--- a/autosub/sub_utils.py
+++ b/autosub/sub_utils.py
@@ -41,15 +41,20 @@ def str_to_file(
 
     if input_m:
         if not os.path.isdir(os.path.dirname(dest)):
-            dest = os.getcwd() + os.path.basename(dest)
+            dest = os.getcwd() + os.sep + os.path.basename(dest)
+
         while os.path.isfile(dest):
+            old_dest = dest
             print(_("There is already a file with the same path "
                     "or the path isn't valid: \"{dest_name}\".").format(dest_name=dest))
             dest = input_m(
                 _("Input a new path (including directory and file name) for output file.\n"))
+            if dest == "":
+                dest = old_dest
+                continue
             dest = dest.rstrip("\"").lstrip("\"")
             if not os.path.isdir(os.path.dirname(dest)):
-                dest = os.getcwd() + os.path.basename(dest)
+                dest = os.getcwd() + os.sep + os.path.basename(dest)
             dest = os.path.splitext(dest)[0]
             dest = "{base}{ext}".format(base=dest,
                                         ext=ext)
@@ -627,6 +632,9 @@ def pysubs2_ssa_event_add(  # pylint: disable=too-many-branches, too-many-statem
             # text_list is [text, text, ...]
             i = 0
             length = len(text_list)
+            if length != src_ssafile.events.__len__():
+                text_list = [i for i in text_list if i]
+                length = len(text_list)
             if same_event_type == 0:
                 #  append text_list to new events
                 if style_name:
diff --git a/requirements.txt b/requirements.txt
index ecb6aba9..39b95acd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,10 +1,10 @@
 requests>=2.3.0
 pysubs2>=0.2.4
 progressbar2>=3.34.3
-auditok==0.1.5
+auditok>=0.1.5
 googletrans>=2.4.0
 wcwidth>=0.1.7
-google-cloud-speech>=1.3.1
+google-cloud-speech>=1.3.1,<2.0.0
 websocket-client>=0.56.0
 fuzzywuzzy>=0.18.0
 python-Levenshtein>=0.12.0
diff --git a/setup.py b/setup.py
index bfdfa116..d1c9d6be 100644
--- a/setup.py
+++ b/setup.py
@@ -34,11 +34,11 @@
         'requests>=2.3.0',
         'pysubs2>=0.2.4',
         'progressbar2>=3.34.3',
-        'auditok==0.1.5',
+        'auditok>=0.1.5',
         'googletrans>=2.4.0',
         'wcwidth>=0.1.7',
         'fuzzywuzzy>=0.18.0',
-        'google-cloud-speech>=1.3.1',
+        'google-cloud-speech>=1.3.1,<2.0.0',
         'websocket-client>=0.56.0',
         'python-docx>=0.8.10',
         'send2trash>=1.5.0'