fix(channel management): Implement channel initialization grace period handling to ensure proper state transitions during live stream startup. Channels now honor the configured grace period for buffer filling, promoting to active state when conditions are met. Updated related tests and documentation for clarity. (Fixes #1380)

CHANGELOG.md

@@ -54,6 +54,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- **Channel Initialization Grace Period is honoured during live stream startup.** Preview and playback no longer abort after a hardcoded 10s while the channel is still connecting with an empty buffer; the TS generator init-wait stall check and upstream health monitor now use the configured `channel_init_grace_period` (same as the server cleanup watchdog) instead of `CONNECTION_TIMEOUT`. (Fixes #1380)
+- **Channels are marked `active` as soon as the buffer threshold is met and a client is streaming.** Once the initial buffer fills, state is set to `active` immediately when viewers are attached, or `waiting_for_clients` when the buffer is ready but no client is connected yet (e.g. proxy API warmup). The cleanup watchdog no longer waits an extra grace period before promoting to `active`. Proxy settings copy now describes `channel_init_grace_period` as an initialization buffer timeout.
 - **DVR recording playback auth is complete for native video, HLS segments, and redirects.** Completed recordings use `/file/` with native `<video src>`, which cannot send `Authorization` headers. Playback accepts `?token=` query-param JWT (matching VOD streams), and the floating video player appends the token when assigning native URLs. The explicit HLS URL route (`/api/channels/recordings/.../hls/...`) now registers the same authenticators as the ViewSet `@action` handlers—previously only header JWT applied on that path, so `?token=` failed for native HLS clients. When the request used `?token=`, rewritten playlist segment URLs and `/file/`↔`/hls/` redirects preserve the token; hls.js clients that authenticate via `Authorization` are unchanged. `QueryParamJWTAuthentication` reads `request.query_params` on DRF requests.
 - **In-progress DVR playback no longer jumps to the live edge.** The floating video player still opens in-progress recordings at the start of the seekable range, but hls.js was configured with `liveMaxLatencyDurationCount: 10`, which forced the playhead forward to "now" shortly after playback began. Live-edge sync is now disabled for recording HLS so users can watch, pause, and scrub from the beginning while the recording continues. (Fixes #1329)
 - **`refresh_single_m3u_account` no longer re-raises after setting account ERROR.** Matches `refresh_epg_data`: the account status and UI already reflect the failure; Celery no longer marks the task FAILED after the terminal error state is persisted.

apps/channels/tests/test_ts_proxy_teardown.py

@@ -1,6 +1,6 @@
 """Tests for multi-worker channel teardown coordination."""
 import time
-from unittest.mock import MagicMock, patch
+from unittest.mock import ANY, MagicMock, patch
 
 from django.test import TestCase
 
@@ -692,9 +692,8 @@ class InitWaitAbortTests(TestCase):
 
         self.assertEqual(generator._init_wait_abort_reason(server, time.time()), "client_gone")
 
-    def test_abort_when_connect_stalled_without_buffer(self):
-        from apps.proxy.config import TSConfig as Config
-
+    @patch("apps.proxy.live_proxy.output.ts.generator.ConfigHelper.channel_init_grace_period", return_value=10)
+    def test_abort_when_connect_stalled_without_buffer(self, _mock_grace):
         generator = self._make_generator()
         server = MagicMock()
         client_manager = MagicMock()
@@ -707,9 +706,128 @@ class InitWaitAbortTests(TestCase):
         server.redis_client.hget.return_value = b"connecting"
         server.redis_client.get.return_value = None
 
-        started = time.time() - (getattr(Config, "CONNECTION_TIMEOUT", 10) + 1)
+        started = time.time() - 11
         self.assertEqual(generator._init_wait_abort_reason(server, started), "stalled")
 
+    @patch("apps.proxy.live_proxy.output.ts.generator.ConfigHelper.channel_init_grace_period", return_value=30)
+    def test_no_stall_abort_within_init_grace_period(self, _mock_grace):
+        generator = self._make_generator()
+        server = MagicMock()
+        client_manager = MagicMock()
+        client_manager.clients = {"client-1"}
+        server.client_managers = {CHANNEL_ID: client_manager}
+        buffer = MagicMock()
+        buffer.index = 0
+        server.stream_buffers = {CHANNEL_ID: buffer}
+        server.redis_client = MagicMock()
+        server.redis_client.hget.return_value = b"connecting"
+        server.redis_client.get.return_value = None
+
+        started = time.time() - 15
+        self.assertIsNone(generator._init_wait_abort_reason(server, started))
+
+    @patch("apps.proxy.live_proxy.output.ts.generator.ConfigHelper.channel_init_grace_period", return_value=30)
+    def test_stall_abort_after_init_grace_period(self, _mock_grace):
+        generator = self._make_generator()
+        server = MagicMock()
+        client_manager = MagicMock()
+        client_manager.clients = {"client-1"}
+        server.client_managers = {CHANNEL_ID: client_manager}
+        buffer = MagicMock()
+        buffer.index = 0
+        server.stream_buffers = {CHANNEL_ID: buffer}
+        server.redis_client = MagicMock()
+        server.redis_client.hget.return_value = b"connecting"
+        server.redis_client.get.return_value = None
+
+        started = time.time() - 31
+        self.assertEqual(generator._init_wait_abort_reason(server, started), "stalled")
+
+
+class PromoteChannelWhenBufferReadyTests(TestCase):
+    def _mock_proxy(self, redis_client):
+        proxy_server = MagicMock()
+        proxy_server.redis_client = redis_client
+        return patch(
+            "apps.proxy.live_proxy.services.channel_service.ProxyServer.get_instance",
+            return_value=proxy_server,
+        ), proxy_server
+
+    @patch("apps.proxy.live_proxy.services.channel_service.ConfigHelper.initial_behind_chunks", return_value=4)
+    def test_buffer_ready_with_clients_becomes_active(self, _mock_chunks):
+        redis = MagicMock()
+        redis.hget.return_value = ChannelState.CONNECTING.encode()
+        redis.get.return_value = b"4"
+        redis.scard.return_value = 2
+
+        ctx, proxy_server = self._mock_proxy(redis)
+        with ctx:
+            result = ChannelService.promote_channel_when_buffer_ready(CHANNEL_ID)
+
+        self.assertEqual(result, ChannelState.ACTIVE)
+        proxy_server.update_channel_state.assert_called_once()
+        args = proxy_server.update_channel_state.call_args[0]
+        self.assertEqual(args[1], ChannelState.ACTIVE)
+        self.assertEqual(args[2]["clients_at_activation"], "2")
+
+    @patch("apps.proxy.live_proxy.services.channel_service.ConfigHelper.initial_behind_chunks", return_value=4)
+    def test_buffer_ready_without_clients_becomes_waiting(self, _mock_chunks):
+        redis = MagicMock()
+        redis.hget.return_value = ChannelState.CONNECTING.encode()
+        redis.get.return_value = b"5"
+        redis.scard.return_value = 0
+
+        ctx, proxy_server = self._mock_proxy(redis)
+        with ctx:
+            result = ChannelService.promote_channel_when_buffer_ready(CHANNEL_ID)
+
+        self.assertEqual(result, ChannelState.WAITING_FOR_CLIENTS)
+        proxy_server.update_channel_state.assert_called_once_with(
+            CHANNEL_ID,
+            ChannelState.WAITING_FOR_CLIENTS,
+            {
+                ChannelMetadataField.CONNECTION_READY_TIME: ANY,
+                ChannelMetadataField.BUFFER_CHUNKS: "5",
+            },
+        )
+
+    @patch("apps.proxy.live_proxy.services.channel_service.ConfigHelper.initial_behind_chunks", return_value=4)
+    def test_buffer_not_ready_does_not_promote(self, _mock_chunks):
+        redis = MagicMock()
+        redis.hget.return_value = ChannelState.CONNECTING.encode()
+        redis.get.return_value = b"2"
+
+        ctx, proxy_server = self._mock_proxy(redis)
+        with ctx:
+            result = ChannelService.promote_channel_when_buffer_ready(CHANNEL_ID)
+
+        self.assertIsNone(result)
+        proxy_server.update_channel_state.assert_not_called()
+
+    def test_waiting_for_clients_with_clients_becomes_active(self):
+        redis = MagicMock()
+
+        def hget_side_effect(key, field):
+            if field == ChannelMetadataField.STATE:
+                return ChannelState.WAITING_FOR_CLIENTS.encode()
+            if field == ChannelMetadataField.CONNECTION_READY_TIME:
+                return b"1700000000.0"
+            return None
+
+        redis.hget.side_effect = hget_side_effect
+        redis.scard.return_value = 1
+
+        ctx, proxy_server = self._mock_proxy(redis)
+        with ctx:
+            result = ChannelService.promote_channel_when_buffer_ready(CHANNEL_ID)
+
+        self.assertEqual(result, ChannelState.ACTIVE)
+        proxy_server.update_channel_state.assert_called_once_with(
+            CHANNEL_ID,
+            ChannelState.ACTIVE,
+            {"clients_at_activation": "1"},
+        )
+
 
 class UpstreamStopBroadcastTests(TestCase):
     def _make_server(self):

apps/proxy/config.py

@@ -133,7 +133,7 @@ class TSConfig(BaseConfig):
 
     @classmethod
     def get_channel_init_grace_period(cls):
-        """Get channel init grace period from database or default"""
+        """Max seconds to wait for initial buffer fill during channel startup."""
         settings = cls.get_proxy_settings()
         return settings.get("channel_init_grace_period", 5)
 

apps/proxy/live_proxy/client_manager.py

@@ -301,6 +301,8 @@ class ClientManager:
                     # Trigger channel stats update via WebSocket
                     self._trigger_stats_update()
 
+                    ChannelService.promote_channel_when_buffer_ready(self.channel_id)
+
                 # Get total clients across all workers
                 total_clients = self.get_total_client_count()
                 logger.info(f"New client connected: {client_id} (local: {len(self.clients)}, total: {total_clients})")

apps/proxy/live_proxy/config_helper.py

@@ -107,7 +107,7 @@ class ConfigHelper:
 
     @staticmethod
     def channel_init_grace_period():
-        """Get channel initialization grace period in seconds"""
+        """Max seconds to wait for initial buffer fill during channel startup."""
         return Config.get_channel_init_grace_period()
 
     @staticmethod

apps/proxy/live_proxy/input/manager.py

@@ -1420,6 +1420,12 @@ class StreamManager:
         """Check if connection retry is allowed"""
         return self.retry_count < self.max_retries
 
+    def _health_inactivity_threshold(self):
+        """How long without data before marking the stream unhealthy."""
+        if self.connected and getattr(self.buffer, 'index', 0) == 0:
+            return ConfigHelper.channel_init_grace_period()
+        return getattr(Config, 'CONNECTION_TIMEOUT', 10)
+
     def _monitor_health(self):
         """Monitor stream health and set flags for the main loop to handle recovery"""
         consecutive_unhealthy_checks = 0
@@ -1435,7 +1441,7 @@ class StreamManager:
             try:
                 now = time.time()
                 inactivity_duration = now - self.last_data_time
-                timeout_threshold = getattr(Config, 'CONNECTION_TIMEOUT', 10)
+                timeout_threshold = self._health_inactivity_threshold()
 
                 if inactivity_duration > timeout_threshold and self.connected:
                     if self.healthy:
@@ -1830,19 +1836,9 @@ class StreamManager:
                             timer.start()
                             return False
 
-                        # We have enough buffer, proceed with state change
-                        update_data = {
-                            ChannelMetadataField.STATE: ChannelState.WAITING_FOR_CLIENTS,
-                            ChannelMetadataField.CONNECTION_READY_TIME: current_time,
-                            ChannelMetadataField.STATE_CHANGED_AT: current_time,
-                            ChannelMetadataField.BUFFER_CHUNKS: str(current_buffer_index)
-                        }
-                        redis_client.hset(metadata_key, mapping=update_data)
+                        from ..services.channel_service import ChannelService
 
-                        # Get configured grace period or default
-                        grace_period = ConfigHelper.channel_init_grace_period()
-                        logger.info(f"STREAM MANAGER: Updated channel {channel_id} state: {current_state or 'None'} -> {ChannelState.WAITING_FOR_CLIENTS} with {current_buffer_index} buffer chunks")
-                        logger.info(f"Started initial connection grace period ({grace_period}s) for channel {channel_id}")
+                        ChannelService.promote_channel_when_buffer_ready(channel_id)
                     else:
                         logger.debug(f"Not changing state: channel {channel_id} already in {current_state} state")
         except Exception as e:

apps/proxy/live_proxy/output/ts/generator.py

@@ -159,8 +159,8 @@ class StreamGenerator:
                     return "client_gone"
 
         elapsed = time.time() - initialization_start
-        connection_timeout = getattr(Config, 'CONNECTION_TIMEOUT', 10)
-        if elapsed < connection_timeout or not proxy_server.redis_client:
+        init_grace_period = ConfigHelper.channel_init_grace_period()
+        if elapsed < init_grace_period or not proxy_server.redis_client:
             return None
 
         metadata_key = RedisKeys.channel_metadata(self.channel_id)
@@ -204,7 +204,7 @@ class StreamGenerator:
                 logger.warning(
                     f"[{self.client_id}] Channel {self.channel_id} stalled in connecting state "
                     f"with no buffer data after "
-                    f"{getattr(Config, 'CONNECTION_TIMEOUT', 10)}s, aborting init wait"
+                    f"{ConfigHelper.channel_init_grace_period()}s, aborting init wait"
                 )
                 yield create_ts_packet('error', "Error: Connection stalled")
                 return False

apps/proxy/live_proxy/server.py

@@ -789,7 +789,7 @@ class ProxyServer:
                 attempt_key = RedisKeys.connection_attempt(channel_id)
                 self.redis_client.setex(attempt_key, 60, str(time.time()))
 
-                logger.info(f"Channel {channel_id} in {ChannelState.CONNECTING} state - will start grace period after connection")
+                logger.info(f"Channel {channel_id} in {ChannelState.CONNECTING} state - waiting for buffer to fill")
             return True
 
         except Exception as e:
@@ -1758,7 +1758,7 @@ class ProxyServer:
                             if time.time() % 30 < 1:  # Every ~30 seconds
                                 logger.info(f"Channel {channel_id} has {total_clients} clients, state: {channel_state}")
 
-                            # If in connecting or waiting_for_clients state, check grace period
+                            # Pre-active channels: init timeouts and buffer-ready promotion
                             if channel_state in [ChannelState.INITIALIZING, ChannelState.CONNECTING, ChannelState.WAITING_FOR_CLIENTS]:
                                 # Check if channel is already stopping
                                 if self.redis_client:
@@ -1824,27 +1824,13 @@ class ProxyServer:
                                                 )
                                                 self._coordinated_stop_channel(channel_id)
                                                 continue
-                                elif connection_ready_time:
-                                    # We have clients now, but check grace period for state transition
-                                    grace_period = ConfigHelper.channel_init_grace_period()
-                                    time_since_ready = time.time() - connection_ready_time
+                                elif (
+                                    channel_state == ChannelState.WAITING_FOR_CLIENTS
+                                    and total_clients > 0
+                                ):
+                                    from .services.channel_service import ChannelService
 
-                                    logger.debug(f"GRACE PERIOD CHECK: Channel {channel_id} in {channel_state} state, "
-                                                 f"time_since_ready={time_since_ready:.1f}s, grace_period={grace_period}s, "
-                                                 f"total_clients={total_clients}")
-
-                                    if time_since_ready <= grace_period:
-                                        # Still within grace period
-                                        logger.debug(f"Channel {channel_id} in grace period - {time_since_ready:.1f}s of {grace_period}s elapsed")
-                                        continue
-                                    else:
-                                        # Grace period expired with clients - mark channel as active
-                                        logger.info(f"Grace period expired with {total_clients} clients - marking channel {channel_id} as active")
-                                        if self.update_channel_state(channel_id, ChannelState.ACTIVE, {
-                                            "grace_period_ended_at": str(time.time()),
-                                            "clients_at_activation": str(total_clients)
-                                        }):
-                                            logger.info(f"Channel {channel_id} activated with {total_clients} clients after grace period")
+                                    ChannelService.promote_channel_when_buffer_ready(channel_id)
                             # If active and no clients, start normal shutdown procedure
                             elif channel_state not in [ChannelState.CONNECTING, ChannelState.WAITING_FOR_CLIENTS] and total_clients == 0:
                                 # Check if channel is already stopping

apps/proxy/live_proxy/services/channel_service.py

@@ -192,6 +192,78 @@ class ChannelService:
             ChannelState.CONNECTING,
         )
 
+    @staticmethod
+    def promote_channel_when_buffer_ready(channel_id):
+        """
+        Promote channel state once the initial buffer threshold is met.
+
+        - connecting/initializing + buffer ready + clients -> active
+        - connecting/initializing + buffer ready + no clients -> waiting_for_clients
+        - waiting_for_clients + clients -> active
+
+        Returns the resulting state, or None when no promotion applies.
+        """
+        proxy_server = ProxyServer.get_instance()
+        redis_client = proxy_server.redis_client
+        if not redis_client:
+            return None
+
+        metadata_key = RedisKeys.channel_metadata(channel_id)
+        state_raw = redis_client.hget(metadata_key, ChannelMetadataField.STATE)
+        if not state_raw:
+            return None
+
+        state = state_raw.decode() if isinstance(state_raw, bytes) else state_raw
+        if state == ChannelState.ACTIVE:
+            return ChannelState.ACTIVE
+
+        if state == ChannelState.WAITING_FOR_CLIENTS:
+            ready_raw = redis_client.hget(
+                metadata_key, ChannelMetadataField.CONNECTION_READY_TIME
+            )
+            if not ready_raw:
+                return None
+            client_count = redis_client.scard(RedisKeys.clients(channel_id)) or 0
+            if client_count <= 0:
+                return ChannelState.WAITING_FOR_CLIENTS
+            proxy_server.update_channel_state(
+                channel_id,
+                ChannelState.ACTIVE,
+                {"clients_at_activation": str(client_count)},
+            )
+            return ChannelState.ACTIVE
+
+        if state not in (ChannelState.INITIALIZING, ChannelState.CONNECTING):
+            return None
+
+        try:
+            buffer_index = int(redis_client.get(RedisKeys.buffer_index(channel_id)) or 0)
+        except (TypeError, ValueError):
+            buffer_index = 0
+
+        chunks_needed = ConfigHelper.initial_behind_chunks()
+        if buffer_index < chunks_needed:
+            return None
+
+        client_count = redis_client.scard(RedisKeys.clients(channel_id)) or 0
+        new_state = (
+            ChannelState.ACTIVE if client_count > 0 else ChannelState.WAITING_FOR_CLIENTS
+        )
+        current_time = str(time.time())
+        extra = {
+            ChannelMetadataField.CONNECTION_READY_TIME: current_time,
+            ChannelMetadataField.BUFFER_CHUNKS: str(buffer_index),
+        }
+        if new_state == ChannelState.ACTIVE:
+            extra["clients_at_activation"] = str(client_count)
+
+        proxy_server.update_channel_state(channel_id, new_state, extra)
+        logger.info(
+            f"Channel {channel_id} buffer ready ({buffer_index}/{chunks_needed} chunks) "
+            f"-> {new_state} (clients={client_count})"
+        )
+        return new_state
+
     @staticmethod
     def initialize_channel(channel_id, stream_url, user_agent, transcode=False, stream_profile_value=None, stream_id=None, m3u_profile_id=None, channel_name=None, stream_name=None):
         """

core/serializers.py

@@ -121,7 +121,9 @@ class ProxySettingsSerializer(serializers.Serializer):
 
     def validate_channel_init_grace_period(self, value):
         if value < 0 or value > 60:
-            raise serializers.ValidationError("Channel init grace period must be between 0 and 60 seconds")
+            raise serializers.ValidationError(
+                "Channel initialization timeout must be between 0 and 60 seconds"
+            )
         return value
 
     def validate_new_client_behind_seconds(self, value):

frontend/src/constants.js

@@ -52,8 +52,9 @@ export const PROXY_SETTINGS_OPTIONS = {
       'Delay in seconds before shutting down a channel after last client disconnects',
   },
   channel_init_grace_period: {
-    label: 'Channel Initialization Grace Period',
-    description: 'Grace period in seconds during channel initialization',
+    label: 'Channel Initialization Timeout',
+    description:
+      'Maximum seconds to wait for the initial buffer to fill while a channel is connecting. Channels that never receive enough buffered data are stopped after this limit.',
   },
   new_client_behind_seconds: {
     label: 'New Client Buffer (seconds)',