[extractor] Add field `audio_channels`

README.md

@@ -1276,6 +1276,7 @@ The available fields are:
  - `vbr` (numeric): Average video bitrate in KBit/s
  - `fps` (numeric): Frame rate
  - `dynamic_range` (string): The dynamic range of the video
+ - `audio_channels` (numeric): The number of audio channels
  - `stretched_ratio` (float): `width:height` of the video's pixels, if not square
  - `vcodec` (string): Name of the video codec in use
  - `container` (string): Name of the container format
@@ -1529,6 +1530,7 @@ The available fields are:
  - `res`: Video resolution, calculated as the smallest dimension.
  - `fps`: Framerate of video
  - `hdr`: The dynamic range of the video (`DV` > `HDR12` > `HDR10+` > `HDR10` > `HLG` > `SDR`)
+ - `channels`: The number of audio channels
  - `tbr`: Total average bitrate in KBit/s
  - `vbr`: Average video bitrate in KBit/s
  - `abr`: Average audio bitrate in KBit/s

yt_dlp/YoutubeDL.py

@@ -527,7 +527,8 @@ class YoutubeDL:
     """
 
     _NUMERIC_FIELDS = {
-        'width', 'height', 'tbr', 'abr', 'asr', 'vbr', 'fps', 'filesize', 'filesize_approx',
+        'width', 'height', 'asr', 'audio_channels', 'fps',
+        'tbr', 'abr', 'vbr', 'filesize', 'filesize_approx',
         'timestamp', 'release_timestamp',
         'duration', 'view_count', 'like_count', 'dislike_count', 'repost_count',
         'average_rating', 'comment_count', 'age_limit',
@@ -539,7 +540,7 @@ class YoutubeDL:
     _format_fields = {
         # NB: Keep in sync with the docstring of extractor/common.py
         'url', 'manifest_url', 'manifest_stream_number', 'ext', 'format', 'format_id', 'format_note',
-        'width', 'height', 'resolution', 'dynamic_range', 'tbr', 'abr', 'acodec', 'asr',
+        'width', 'height', 'resolution', 'dynamic_range', 'tbr', 'abr', 'acodec', 'asr', 'audio_channels',
         'vbr', 'fps', 'vcodec', 'container', 'filesize', 'filesize_approx',
         'player_url', 'protocol', 'fragment_base_url', 'fragments', 'is_from_start',
         'preference', 'language', 'language_preference', 'quality', 'source_preference',
@@ -2129,6 +2130,7 @@ class YoutubeDL:
                     'acodec': the_only_audio.get('acodec'),
                     'abr': the_only_audio.get('abr'),
                     'asr': the_only_audio.get('asr'),
+                    'audio_channels': the_only_audio.get('audio_channels')
                 })
 
             return new_dict
@@ -3569,6 +3571,7 @@ class YoutubeDL:
                 format_field(f, func=self.format_resolution, ignore=('audio only', 'images')),
                 format_field(f, 'fps', '\t%d', func=round),
                 format_field(f, 'dynamic_range', '%s', ignore=(None, 'SDR')).replace('HDR', ''),
+                format_field(f, 'audio_channels', '\t%s'),
                 delim,
                 format_field(f, 'filesize', ' \t%s', func=format_bytes) + format_field(f, 'filesize_approx', '~\t%s', func=format_bytes),
                 format_field(f, 'tbr', '\t%dk', func=round),
@@ -3588,7 +3591,7 @@ class YoutubeDL:
                     delim=' '),
             ] for f in formats if f.get('preference') is None or f['preference'] >= -1000]
         header_line = self._list_format_headers(
-            'ID', 'EXT', 'RESOLUTION', '\tFPS', 'HDR', delim, '\tFILESIZE', '\tTBR', 'PROTO',
+            'ID', 'EXT', 'RESOLUTION', '\tFPS', 'HDR', 'CH', delim, '\tFILESIZE', '\tTBR', 'PROTO',
             delim, 'VCODEC', '\tVBR', 'ACODEC', '\tABR', '\tASR', 'MORE INFO')
 
         return render_table(

yt_dlp/extractor/common.py

@@ -154,6 +154,7 @@ class InfoExtractor:
                     * abr        Average audio bitrate in KBit/s
                     * acodec     Name of the audio codec in use
                     * asr        Audio sampling rate in Hertz
+                    * audio_channels  Number of audio channels
                     * vbr        Average video bitrate in KBit/s
                     * fps        Frame rate
                     * vcodec     Name of the video codec in use
@@ -1668,7 +1669,7 @@ class InfoExtractor:
         regex = r' *((?P<reverse>\+)?(?P<field>[a-zA-Z0-9_]+)((?P<separator>[~:])(?P<limit>.*?))?)? *$'
 
         default = ('hidden', 'aud_or_vid', 'hasvid', 'ie_pref', 'lang', 'quality',
-                   'res', 'fps', 'hdr:12', 'codec:vp9.2', 'size', 'br', 'asr',
+                   'res', 'fps', 'hdr:12', 'channels', 'codec:vp9.2', 'size', 'br', 'asr',
                    'proto', 'ext', 'hasaud', 'source', 'id')  # These must not be aliases
         ytdl_default = ('hasaud', 'lang', 'quality', 'tbr', 'filesize', 'vbr',
                         'height', 'width', 'proto', 'vext', 'abr', 'aext',
@@ -1704,6 +1705,7 @@ class InfoExtractor:
             'height': {'convert': 'float_none'},
             'width': {'convert': 'float_none'},
             'fps': {'convert': 'float_none'},
+            'channels': {'convert': 'float_none', 'field': 'audio_channels'},
             'tbr': {'convert': 'float_none'},
             'vbr': {'convert': 'float_none'},
             'abr': {'convert': 'float_none'},
@@ -1717,13 +1719,14 @@ class InfoExtractor:
             'res': {'type': 'multiple', 'field': ('height', 'width'),
                     'function': lambda it: (lambda l: min(l) if l else 0)(tuple(filter(None, it)))},
 
-            # For compatibility with youtube-dl
+            # Actual field names
             'format_id': {'type': 'alias', 'field': 'id'},
             'preference': {'type': 'alias', 'field': 'ie_pref'},
             'language_preference': {'type': 'alias', 'field': 'lang'},
             'source_preference': {'type': 'alias', 'field': 'source'},
             'protocol': {'type': 'alias', 'field': 'proto'},
             'filesize_approx': {'type': 'alias', 'field': 'fs_approx'},
+            'audio_channels': {'type': 'alias', 'field': 'channels'},
 
             # Deprecated
             'dimension': {'type': 'alias', 'field': 'res', 'deprecated': True},