Fix DRC formats failing to download

test/test_sabr/test_processor.py

@@ -271,6 +271,11 @@ class TestSabrProcessorInitialization:
                 start_time_ms=invalid_start_time_ms,
             )
 
+    def test_client_abr_state_defaults(self, base_args):
+        processor = SabrProcessor(**base_args)
+        # Must be enabled to allow DRC formats to be streamed
+        assert processor.client_abr_state.drc_enabled is True
+
     @pytest.mark.parametrize(
         'duration_sec,tolerance_ms',
         [

yt_dlp/extractor/youtube/_proto/videostreaming/client_abr_state.py

@@ -7,3 +7,4 @@ from yt_dlp.dependencies import protobug
 class ClientAbrState:
     player_time_ms: protobug.Int64 | None = protobug.field(28, default=None)
     enabled_track_types_bitfield: protobug.Int32 | None = protobug.field(40, default=None)
+    drc_enabled: protobug.Bool = protobug.field(46, default=False)

yt_dlp/extractor/youtube/_streaming/sabr/processor.py

@@ -182,7 +182,9 @@ class SabrProcessor:
         self.logger.debug(f'Starting playback at: {self.start_time_ms}ms')
         self.client_abr_state = ClientAbrState(
             player_time_ms=self.start_time_ms,
-            enabled_track_types_bitfield=enabled_track_types_bitfield)
+            enabled_track_types_bitfield=enabled_track_types_bitfield,
+            drc_enabled=True,  # Required to stream DRC formats
+        )
 
     def match_format_selector(self, format_init_metadata):
         for format_selector in (self._video_format_selector, self._audio_format_selector, self._caption_format_selector):

yt_dlp/extractor/youtube/_streaming/sabr/stream.py

@@ -188,7 +188,7 @@ class SabrStream:
     @url.setter
     def url(self, url):
         self.logger.debug(f'New URL: {url}')
-        if hasattr(self, '_url') and ((bn := broadcast_id_from_url(url)) != (bc := broadcast_id_from_url(self.url))):
+        if self.processor.is_live and hasattr(self, '_url') and ((bn := broadcast_id_from_url(url)) != (bc := broadcast_id_from_url(self.url))):
             raise SabrStreamError(f'Broadcast ID changed from {bc} to {bn}. The download will need to be restarted.')
         self._url = url
         if str_or_none(parse_qs(url).get('source', [None])[0]) == 'yt_live_broadcast':