Add support for downloading audio only

README.md

@@ -147,6 +147,12 @@ Setting quality to `source` will download the best available quality:
 twitch-dl download -q source 221837124
 ```
 
+Setting quality to `audio_only` will download only audio:
+
+```
+twitch-dl download -q audio_only 221837124
+```
+
 ### Overriding file name
 
 The target filename can be defined by passing the `--output` option followed by

changelog.yaml

@@ -1,3 +1,8 @@
+1.19.0:
+  date: TBA
+  changes:
+    - "Add support for downloading audio only (#10)"
+
 1.18.1:
   date: 2022-02-05
   changes:

twitchdl/commands/download.py

@@ -18,10 +18,15 @@ from twitchdl.output import print_out
 def _parse_playlists(playlists_m3u8):
     playlists = m3u8.loads(playlists_m3u8)
 
-    for p in playlists.playlists:
-        name = p.media[0].name if p.media else ""
-        resolution = "x".join(str(r) for r in p.stream_info.resolution)
-        yield name, resolution, p.uri
+    for p in sorted(playlists.playlists, key=lambda p: p.stream_info.resolution is None):
+        if p.stream_info.resolution:
+            name = p.media[0].name
+            description = "x".join(str(r) for r in p.stream_info.resolution)
+        else:
+            name = p.media[0].group_id
+            description = None
+
+        yield name, description, p.uri
 
 
 def _get_playlist_by_name(playlists, quality):
@@ -41,7 +46,10 @@ def _get_playlist_by_name(playlists, quality):
 def _select_playlist_interactive(playlists):
     print_out("\nAvailable qualities:")
     for n, (name, resolution, uri) in enumerate(playlists):
+        if resolution:
             print_out("{}) {} [{}]".format(n + 1, name, resolution))
+        else:
+            print_out("{}) {}".format(n + 1, name))
 
     no = utils.read_int("Choose quality", min=1, max=len(playlists) + 1, default=1)
     _, _, uri = playlists[no - 1]

twitchdl/twitch.py

@@ -309,6 +309,7 @@ def get_playlists(video_id, access_token):
     response = requests.get(url, params={
         "nauth": access_token['value'],
         "nauthsig": access_token['signature'],
+        "allow_audio_only": "true",
         "allow_source": "true",
         "player": "twitchweb",
     })