diff --git a/scenedetect/cli/__init__.py b/scenedetect/cli/__init__.py
index 51b028d8..af3add07 100644
--- a/scenedetect/cli/__init__.py
+++ b/scenedetect/cli/__init__.py
@@ -582,7 +582,7 @@ def list_scenes_command(ctx, output, filename, no_output_file, quiet):
     'Override codec arguments/options passed to FFmpeg when splitting and re-encoding'
     ' scenes. Use double quotes (") around specified arguments. Must specify at least'
     ' audio/video codec to use (e.g. -a "-c:v [...] and -c:a [...]"). [default:'
-    ' "-c:v libx264 -preset veryfast -crf 22 -c:a copy"]')
+    ' "-c:v libx264 -preset veryfast -crf 22 -c:a aac"]')
 @click.option(
     '--quiet', '-q',
     is_flag=True, flag_value=True, help=
@@ -637,7 +637,7 @@ def split_video_command(ctx, output, filename, high_quality, override_args, quie
             rate_factor = 22 if not high_quality else 17
         if preset is None:
             preset = 'veryfast' if not high_quality else 'slow'
-        override_args = ('-c:v libx264 -preset {PRESET} -crf {RATE_FACTOR} -c:a copy'.format(
+        override_args = ('-c:v libx264 -preset {PRESET} -crf {RATE_FACTOR} -c:a aac'.format(
             PRESET=preset, RATE_FACTOR=rate_factor))
     if not copy:
         logging.info('FFmpeg codec args set: %s', override_args)
diff --git a/scenedetect/frame_timecode.py b/scenedetect/frame_timecode.py
index a295e36e..44eaad10 100644
--- a/scenedetect/frame_timecode.py
+++ b/scenedetect/frame_timecode.py
@@ -214,6 +214,15 @@ def get_timecode(self, precision=3, use_rounding=True):
         # Return hours, minutes, and seconds as a formatted timecode string.
         return '%02d:%02d:%s' % (hrs, mins, secs)
 
+    def previous_frame(self):
+        # type: () -> FrameTimecode
+        """
+        Returns a new FrameTimecode for the frame before this one.
+        :return: New FrameTimeCode object, one frame earlier
+        """
+        new_timecode = FrameTimecode(self)
+        new_timecode.frame_num -= 1
+        return new_timecode
 
     def _seconds_to_frames(self, seconds):
         # type: (float) -> int
diff --git a/scenedetect/video_splitter.py b/scenedetect/video_splitter.py
index ed08ad41..cf5082a8 100644
--- a/scenedetect/video_splitter.py
+++ b/scenedetect/video_splitter.py
@@ -174,7 +174,7 @@ def split_video_mkvmerge(input_video_paths, scene_list, output_file_prefix,
 
 
 def split_video_ffmpeg(input_video_paths, scene_list, output_file_template, video_name,
-                       arg_override='-c:v libx264 -preset fast -crf 21 -c:a copy',
+                       arg_override='-c:v libx264 -preset fast -crf 21 -c:a aac',
                        hide_progress=False, suppress_output=False):
     # type: (List[str], List[Tuple[FrameTimecode, FrameTimecode]], Optional[str],
     #        Optional[str], Optional[bool]) -> None
@@ -229,13 +229,12 @@ def split_video_ffmpeg(input_video_paths, scene_list, output_file_template, vide
                 '-ss',
                 str(start_time.get_seconds()),
                 '-i',
-                input_video_paths[0]]
+                input_video_paths[0],
+                '-t',
+                str(duration.get_seconds())
+            ]
             call_list += arg_override
             call_list += [
-                '-strict',
-                '-2',
-                '-t',
-                str(duration.get_seconds()),
                 '-sn',
                 filename_template.safe_substitute(
                     VIDEO_NAME=video_name,