add new option audio extraction

add option -e you can extract audio form downloaded video

src/you_get/common.py

@@ -138,6 +138,8 @@ cookies = None
 output_filename = None
 auto_rename = False
 insecure = False
+extract_audio = False
+extract_format = 'mp3'
 
 fake_headers = {
     'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',  # noqa
@@ -981,6 +983,9 @@ def download_urls(
             headers=headers, **kwargs
         )
         bar.done()
+        if extract_audio:
+            from .processor.ffmpeg import ffmpeg_extract_audio_from_video
+            ffmpeg_extract_audio_from_video(output_filepath, ext=extract_format)
     else:
         parts = []
         print('Downloading %s ...' % tr(output_filename))
@@ -1007,6 +1012,9 @@ def download_urls(
                 from .processor.ffmpeg import ffmpeg_concat_av
                 ret = ffmpeg_concat_av(parts, output_filepath, ext)
                 print('Merged into %s' % output_filename)
+                if extract_audio:
+                    from .processor.ffmpeg import ffmpeg_extract_audio_from_video
+                    ffmpeg_extract_audio_from_video(output_filepath, ext=extract_format)
                 if ret == 0:
                     for part in parts:
                         os.remove(part)
@@ -1021,6 +1029,9 @@ def download_urls(
                     from .processor.join_flv import concat_flv
                     concat_flv(parts, output_filepath)
                 print('Merged into %s' % output_filename)
+                if extract_audio:
+                    from .processor.ffmpeg import ffmpeg_extract_audio_from_video
+                    ffmpeg_extract_audio_from_video(output_filepath, ext=extract_format)
             except:
                 raise
             else:
@@ -1032,11 +1043,13 @@ def download_urls(
                 from .processor.ffmpeg import has_ffmpeg_installed
                 if has_ffmpeg_installed():
                     from .processor.ffmpeg import ffmpeg_concat_mp4_to_mp4
-                    ffmpeg_concat_mp4_to_mp4(parts, output_filepath)
                 else:
                     from .processor.join_mp4 import concat_mp4
                     concat_mp4(parts, output_filepath)
                 print('Merged into %s' % output_filename)
+                if extract_audio:
+                    from .processor.ffmpeg import ffmpeg_extract_audio_from_video
+                    ffmpeg_extract_audio_from_video(output_filepath, ext=extract_format)
             except:
                 raise
             else:
@@ -1053,6 +1066,9 @@ def download_urls(
                     from .processor.join_ts import concat_ts
                     concat_ts(parts, output_filepath)
                 print('Merged into %s' % output_filename)
+                if extract_audio:
+                    from .processor.ffmpeg import ffmpeg_extract_audio_from_video
+                    ffmpeg_extract_audio_from_video(output_filepath, ext=extract_format)
             except:
                 raise
             else:
@@ -1520,11 +1536,18 @@ def script_main(download, download_playlist, **kwargs):
         '-a', '--auto-rename', action='store_true', default=False,
         help='Auto rename same name different files'
     )
-
     download_grp.add_argument(
         '-k', '--insecure', action='store_true', default=False,
         help='ignore ssl errors'
     )
+    download_grp.add_argument(
+        '-e', '--extract-audio', action='store_true', default=False,
+        help='extract audio from video'
+    )
+    download_grp.add_argument(
+        '-E', '--extract-audio-format', metavar='FORMAT', default='mp3',
+        help='set extracted audio format'
+    )
 
     proxy_grp = parser.add_argument_group('Proxy options')
     proxy_grp = proxy_grp.add_mutually_exclusive_group()
@@ -1572,6 +1595,9 @@ def script_main(download, download_playlist, **kwargs):
     global output_filename
     global auto_rename
     global insecure
+    global extract_audio
+    global extract_format
+
     output_filename = args.output_filename
     extractor_proxy = args.extractor_proxy
 
@@ -1600,6 +1626,9 @@ def script_main(download, download_playlist, **kwargs):
     if args.player:
         player = args.player
         caption = False
+    if args.extract_audio:
+        extract_audio = True
+    extract_format = args.extract_audio_format
 
     if args.insecure:
         # ignore ssl

src/you_get/processor/ffmpeg.py

@@ -264,7 +264,7 @@ def ffmpeg_download_stream(files, title, ext, params={}, output_dir='.', stream=
 
 def ffmpeg_concat_audio_and_video(files, output, ext):
     print('Merging video and audio parts... ', end="", flush=True)
-    if has_ffmpeg_installed:
+    if has_ffmpeg_installed():
         params = [FFMPEG] + LOGLEVEL
         params.extend(['-f', 'concat'])
         params.extend(['-safe', '0'])  # https://stackoverflow.com/questions/38996925/ffmpeg-concat-unsafe-file-name
@@ -288,3 +288,25 @@ def ffprobe_get_media_duration(file):
     params.extend(['-v', 'quiet'])
     params.extend(['-of', 'csv=p=0'])
     return subprocess.check_output(params, stdin=STDIN, stderr=subprocess.STDOUT).decode().strip()
+
+
+def ffmpeg_extract_audio_from_video(video_file_path, ext='mp3'):
+    if has_ffmpeg_installed():
+        print('extracting audio from video... ', end="", flush=True)
+
+        path_without_ext = os.path.splitext(video_file_path)[0]
+        output_path = path_without_ext+"."+ ext
+
+        params = [FFMPEG] + LOGLEVEL
+        params.extend(['-i', video_file_path])
+        params.extend(['-f', ext])
+        params.append(path_without_ext+"."+ext)
+        # os.remove(video_file_path)
+        return_val = subprocess.call(params, stdin=STDIN)
+        if return_val == 0:
+            print('\nextracted into ' + output_path)
+        else:
+            print("\nextract error")
+        return
+    else:
+        raise EnvironmentError('\nNo ffmpeg found')