ITS: clean up gpylint errors in utils files

bug: 229024916
Change-Id: I60e0c9c1e33c4b7b21b3109f18808bdc3d1a4c75
diff --git a/apps/CameraITS/utils/video_processing_utils.py b/apps/CameraITS/utils/video_processing_utils.py
index b0fef2c..894729c 100644
--- a/apps/CameraITS/utils/video_processing_utils.py
+++ b/apps/CameraITS/utils/video_processing_utils.py
@@ -19,7 +19,6 @@
 import logging
 import os.path
 import subprocess
-import time
 
 
 ITS_SUPPORTED_QUALITIES = (
@@ -37,8 +36,7 @@
 
 
 def extract_key_frames_from_video(log_path, video_file_name):
-  """
-  Returns a list of extracted key frames.
+  """Returns a list of extracted key frames.
 
   Ffmpeg tool is used to extract key frames from the video at path
   os.path.join(log_path, video_file_name).
@@ -51,26 +49,26 @@
   Args:
     log_path: path for video file directory
     video_file_name: name of the video file.
-    Ex: VID_20220325_050918_0_CIF_352x288.mp4
   Returns:
     key_frame_files: A list of paths for each key frame extracted from the
-    video.
+    video. Ex: VID_20220325_050918_0_CIF_352x288.mp4
   """
   ffmpeg_image_name = f"{video_file_name.split('.')[0]}_key_frame"
-  ffmpeg_image_file_path = os.path.join(log_path, ffmpeg_image_name + '_%02d.png')
+  ffmpeg_image_file_path = os.path.join(
+      log_path, ffmpeg_image_name + '_%02d.png')
   cmd = ['ffmpeg',
-    '-skip_frame',
-    'nokey',
-    '-i',
-    os.path.join(log_path, video_file_name),
-    '-vsync',
-    'vfr',
-    '-frame_pts',
-    'true' ,
-    ffmpeg_image_file_path,
-  ]
-  logging.debug('Extracting key frames from: %s' % video_file_name)
-  output = subprocess.call(cmd)
+         '-skip_frame',
+         'nokey',
+         '-i',
+         os.path.join(log_path, video_file_name),
+         '-vsync',
+         'vfr',
+         '-frame_pts',
+         'true',
+         ffmpeg_image_file_path,
+        ]
+  logging.debug('Extracting key frames from: %s', video_file_name)
+  _ = subprocess.call(cmd)
   arr = os.listdir(os.path.join(log_path))
   key_frame_files = []
   for file in arr:
@@ -80,8 +78,7 @@
 
 
 def get_key_frame_to_process(key_frame_files):
-  """
-  Returns the key frame file from the list of key_frame_files.
+  """Returns the key frame file from the list of key_frame_files.
 
   If the size of the list is 1 then the file in the list will be returned else
   the file with highest frame_index will be returned for further processing.
@@ -96,8 +93,7 @@
 
 
 def extract_all_frames_from_video(log_path, video_file_name, img_format):
-  """
-  Extracts and returns a list of all extracted frames.
+  """Extracts and returns a list of all extracted frames.
 
   Ffmpeg tool is used to extract all frames from the video at path
   <log_path>/<video_file_name>. The extracted key frames will have the name