zoom
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -5,6 +5,21 @@ All notable changes to the Zoom RTMS SDK will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.0.3] - 2026-02-17
+
+### Added
+
+- **Webinar support**: Added `webinar_uuid` parameter to `join()` for Zoom Webinar events (`webinar.rtms_started`); priority: `meeting_uuid` > `webinar_uuid` > `session_id`
+- **`onMediaConnectionInterrupted` callback**: New high-level callback for `EVENT_MEDIA_CONNECTION_INTERRUPTED` events with auto-subscription (Node.js and Python)
+
+### Fixed
+
+- **Release crash on ended sessions**: `release()` no longer throws when the meeting has already ended externally; cleanup always completes and `RTMS_SDK_NOT_EXIST` is treated as success ([#93](https://github.com/zoom/rtms/issues/93))
+- **Video params ignored after audio params**: Calling `setAudioParams()` before `setVideoParams()` no longer overwrites video configuration with defaults; individual param setters skip the default-filling logic ([#94](https://github.com/zoom/rtms/issues/94))
+- **Express middleware compatibility**: `createWebhookHandler` now reads from `req.body` when pre-parsed by middleware (e.g., `express.json()`), preventing hangs when the request stream has already been consumed ([#96](https://github.com/zoom/rtms/issues/96))
+- **Webhook schema validation**: Webhook handlers (Node.js and Python) now validate that the `event` field is present in the payload and return 400 Bad Request for invalid payloads ([#95](https://github.com/zoom/rtms/issues/95))
+- **Python event callback coexistence**: Refactored to shared event dispatcher so `onParticipantEvent`, `onActiveSpeakerEvent`, and `onSharingEvent` can all be registered simultaneously (previously each overwrote the last)
+
 ## [1.0.2] - 2026-01-30
 
 ### Added

diff --git a/README.md b/README.md
@@ -141,6 +141,10 @@ For detailed contribution guidelines, build instructions, and troubleshooting, s
 
 ## Usage
 
+> **Speaker Identification with Mixed Audio**
+>
+> When using `AUDIO_MIXED_STREAM` (the default), all participants are mixed into a single audio stream and the audio callback's metadata will **not** identify the current speaker. To identify who is speaking, register an `onActiveSpeakerEvent` callback — it fires whenever the active speaker changes. See [Troubleshooting #7](#7-identifying-speakers-with-mixed-audio-streams) and [#80](https://github.com/zoom/rtms/issues/80) for details.
+
 ### Node.js - Webhook Integration
 
 Easily respond to Zoom webhooks and connect to RTMS streams:

diff --git a/index.ts b/index.ts
@@ -246,6 +246,8 @@ function exposeNumberConstants(nativeModule: any): Record<string, number> {
     'MEDIA_TYPE_TRANSCRIPT', 'MEDIA_TYPE_CHAT', 'MEDIA_TYPE_ALL',
     // Session events
     'SESSION_EVENT_ADD', 'SESSION_EVENT_STOP', 'SESSION_EVENT_PAUSE', 'SESSION_EVENT_RESUME',
+    // User events
+    'USER_JOIN', 'USER_LEAVE',
     // Event types (for subscribeEvent/onEventEx)
     'EVENT_UNDEFINED', 'EVENT_FIRST_PACKET_TIMESTAMP', 'EVENT_ACTIVE_SPEAKER_CHANGE',
     'EVENT_PARTICIPANT_JOIN', 'EVENT_PARTICIPANT_LEAVE',
@@ -453,23 +455,28 @@ export function createWebhookHandler(callback: WebhookCallbackUnion, path: strin
       return;
     }
 
-    let body = '';
-    req.on('data', chunk => body += chunk.toString());
-
-    req.on('end', () => {
+    const processPayload = (body: string) => {
       try {
         Logger.debug('webhook', `Received webhook request: ${req.url}`);
         const payload = JSON.parse(body);
-
+
+        // Validate required webhook fields
+        if (!payload.event || typeof payload.event !== 'string') {
+          Logger.warn('webhook', 'Received webhook payload missing required "event" field');
+          res.writeHead(400, headers);
+          res.end(JSON.stringify({ error: 'Invalid webhook payload: missing required "event" field' }));
+          return;
+        }
+
         // Log the webhook event
         Logger.info('webhook', `Received event: ${payload.event || 'unknown'}`, {
           eventType: payload.event,
           payloadSize: body.length
         });
-        
+
         // Check if this is a raw webhook callback
         const isRawCallback = isRawWebhookCallback(callback);
-        
+
         if (isRawCallback) {
           // For raw callbacks, pass req and res objects
           process.nextTick(() => {
@@ -493,7 +500,7 @@ export function createWebhookHandler(callback: WebhookCallbackUnion, path: strin
               Logger.error('webhook', `Error in webhook callback: ${err instanceof Error ? err.message : 'Unknown error'}`);
             }
           });
-          
+
           res.writeHead(200, headers);
           res.end(JSON.stringify({ status: 'ok' }));
         }
@@ -502,7 +509,19 @@ export function createWebhookHandler(callback: WebhookCallbackUnion, path: strin
         res.writeHead(400, headers);
         res.end(JSON.stringify({ error: 'Invalid JSON received' }));
       }
-    });
+    };
+
+    // Check if body was already parsed by middleware (e.g., express.json())
+    if ((req as any).body !== undefined) {
+      const body = typeof (req as any).body === 'string'
+        ? (req as any).body
+        : JSON.stringify((req as any).body);
+      processPayload(body);
+    } else {
+      let body = '';
+      req.on('data', chunk => body += chunk.toString());
+      req.on('end', () => processPayload(body));
+    }
   };
 }
 
@@ -845,6 +864,7 @@ class Client extends nativeRtms.Client {
   private activeSpeakerEventCallback: ((timestamp: number, userId: number, userName: string) => void) | null = null;
   private sharingEventCallback: ((event: 'start' | 'stop', timestamp: number, userId?: number, userName?: string) => void) | null = null;
   private rawEventCallback: ((eventData: string) => void) | null = null;
+  private mediaConnectionInterruptedCallback: ((timestamp: number) => void) | null = null;
   private eventHandlerRegistered: boolean = false;
 
   constructor() {
@@ -920,6 +940,12 @@ class Client extends nativeRtms.Client {
               );
             }
             break;
+
+          case nativeRtms.EVENT_MEDIA_CONNECTION_INTERRUPTED:
+            if (this.mediaConnectionInterruptedCallback) {
+              this.mediaConnectionInterruptedCallback(data.timestamp || 0);
+            }
+            break;
         }
       } catch (e) {
         Logger.error('client', `Failed to parse event: ${e}`);
@@ -947,6 +973,7 @@ class Client extends nativeRtms.Client {
 
     const {
       meeting_uuid,
+      webinar_uuid,
       session_id,
       rtms_stream_id,
       server_urls,
@@ -957,20 +984,20 @@ class Client extends nativeRtms.Client {
       pollInterval = 0
     } = options;
 
-    // Use meeting_uuid for Meeting SDK events, session_id for Video SDK events
-    const instance_id = meeting_uuid || session_id;
+    // Use meeting_uuid for Meeting SDK, webinar_uuid for Webinar, session_id for Video SDK
+    const instance_id = meeting_uuid || webinar_uuid || session_id;
 
     this.pollRate = pollInterval;
 
-    Logger.info('client', `Joining ${meeting_uuid ? 'meeting' : 'session'}: ${instance_id}`, {
+    Logger.info('client', `Joining ${meeting_uuid ? 'meeting' : webinar_uuid ? 'webinar' : 'session'}: ${instance_id}`, {
       streamId: rtms_stream_id,
       serverUrls: server_urls,
       timeout: providedTimeout,
       pollInterval
     });
 
     if (!instance_id) {
-      throw new Error('Either meeting_uuid or session_id must be provided');
+      throw new Error('Either meeting_uuid, webinar_uuid, or session_id must be provided');
     }
 
     const finalSignature = providedSignature || generateSignature({
@@ -1124,6 +1151,34 @@ class Client extends nativeRtms.Client {
     return true;
   }
 
+  /**
+   * Register a callback for media connection interrupted events
+   *
+   * This automatically subscribes to EVENT_MEDIA_CONNECTION_INTERRUPTED.
+   *
+   * @param callback Function called when the media connection is interrupted
+   * @returns true if registration succeeds
+   *
+   * @example
+   * ```typescript
+   * client.onMediaConnectionInterrupted((timestamp) => {
+   *   console.log(`Media connection interrupted at ${timestamp}`);
+   * });
+   * ```
+   */
+  onMediaConnectionInterrupted(callback: (timestamp: number) => void): boolean {
+    this.mediaConnectionInterruptedCallback = callback;
+    this.setupEventHandler();
+
+    try {
+      super.subscribeEvent([nativeRtms.EVENT_MEDIA_CONNECTION_INTERRUPTED]);
+    } catch (e) {
+      Logger.warn('client', `Failed to auto-subscribe to media connection interrupted events: ${e}`);
+    }
+
+    return true;
+  }
+
   /**
    * Register a callback for raw event data
    *

diff --git a/package.json b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@zoom/rtms",
-  "version": "1.0.2",
+  "version": "1.0.3",
   "description": "Node.js Wrapper for the Zoom RTMS C SDK",
   "main": "./build/Release/index.js",
   "types": "rtms.d.ts",

diff --git a/pyproject.toml b/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "scikit_build_core.build"
 
 [project]
 name = "rtms"
-version = "1.0.2"
+version = "1.0.3"
 description = "Python bindings for the Zoom RTMS C SDK - Real-Time Media Streaming"
 readme = "README.md"
 requires-python = ">=3.10"

diff --git a/rtms.d.ts b/rtms.d.ts
@@ -305,14 +305,17 @@ export interface DeskshareParams {
  * Parameters for joining a Zoom RTMS session
  *
  * For Meeting SDK events (meeting.rtms_started), use meeting_uuid.
+ * For Webinar events (webinar.rtms_started), use webinar_uuid.
  * For Video SDK events (session.rtms_started), use session_id.
- * If both are provided, meeting_uuid takes precedence.
+ * Priority: meeting_uuid > webinar_uuid > session_id.
  *
  * @category Common Interfaces
  */
 export interface JoinParams {
   /** The UUID of the Zoom meeting (for Meeting SDK events) */
   meeting_uuid?: string;
+  /** The UUID of the Zoom webinar (for Webinar events) */
+  webinar_uuid?: string;
   /** The session ID (for Video SDK events) - used when meeting_uuid is not provided */
   session_id?: string;
   /** The RTMS stream ID for this connection */
@@ -876,6 +879,23 @@ export class Client {
    */
   onSharingEvent(callback: SharingEventCallback): boolean;
 
+  /**
+   * Sets a callback for media connection interrupted events
+   *
+   * This automatically subscribes to EVENT_MEDIA_CONNECTION_INTERRUPTED.
+   *
+   * @param callback The callback function to invoke with the event timestamp
+   * @returns true if the callback was set successfully
+   *
+   * @example
+   * ```typescript
+   * client.onMediaConnectionInterrupted((timestamp) => {
+   *   console.log(`Media connection interrupted at ${timestamp}`);
+   * });
+   * ```
+   */
+  onMediaConnectionInterrupted(callback: (timestamp: number) => void): boolean;
+
   /**
    * Sets a callback for raw event data
    *

diff --git a/src/rtms.cpp b/src/rtms.cpp
@@ -461,33 +461,37 @@ void Client::uninitialize() {
     rtms_uninit();
 }
 
-void Client::configure(const MediaParams& params, int media_types, bool enable_application_layer_encryption) {
+void Client::configure(const MediaParams& params, int media_types, bool enable_application_layer_encryption, bool apply_defaults) {
     // Store the media parameters for future use
     media_params_ = params;
     enabled_media_types_ = media_types;
     media_params_updated_ = true;
 
     // If media types are enabled but no params were set, use sensible defaults
     // This ensures proper metadata attribution (e.g., AUDIO_MULTI_STREAMS for audio)
-    if ((media_types & MediaType::AUDIO) && !media_params_.hasAudioParams()) {
+    // Skip defaults when called from setAudioParams/setVideoParams/setDeskshareParams
+    // to avoid prematurely filling in default params for other media types
+    if (apply_defaults) {
+        if ((media_types & MediaType::AUDIO) && !media_params_.hasAudioParams()) {
 #ifdef RTMS_DEBUG
-        cerr << "[DEBUG CONFIG] Audio enabled but no params set, using defaults (AUDIO_MULTI_STREAMS)" << endl;
+            cerr << "[DEBUG CONFIG] Audio enabled but no params set, using defaults (AUDIO_MULTI_STREAMS)" << endl;
 #endif
-        media_params_.setAudioParams(AudioParams());
-    }
+            media_params_.setAudioParams(AudioParams());
+        }
 
-    if ((media_types & MediaType::VIDEO) && !media_params_.hasVideoParams()) {
+        if ((media_types & MediaType::VIDEO) && !media_params_.hasVideoParams()) {
 #ifdef RTMS_DEBUG
-        cerr << "[DEBUG CONFIG] Video enabled but no params set, using defaults" << endl;
+            cerr << "[DEBUG CONFIG] Video enabled but no params set, using defaults" << endl;
 #endif
-        media_params_.setVideoParams(VideoParams());
-    }
+            media_params_.setVideoParams(VideoParams());
+        }
 
-    if ((media_types & MediaType::DESKSHARE) && !media_params_.hasDeskshareParams()) {
+        if ((media_types & MediaType::DESKSHARE) && !media_params_.hasDeskshareParams()) {
 #ifdef RTMS_DEBUG
-        cerr << "[DEBUG CONFIG] Deskshare enabled but no params set, using defaults" << endl;
+            cerr << "[DEBUG CONFIG] Deskshare enabled but no params set, using defaults" << endl;
 #endif
-        media_params_.setDeskshareParams(DeskshareParams());
+            media_params_.setDeskshareParams(DeskshareParams());
+        }
     }
 
     if (!media_params_.hasAudioParams() && !media_params_.hasVideoParams() && !media_params_.hasDeskshareParams()) {
@@ -568,8 +572,11 @@ void Client::setOnSessionUpdate(SessionUpdateFn callback) {
 }
 
 void Client::setOnUserUpdate(UserUpdateFn callback) {
-    lock_guard<mutex> lock(mutex_);
-    user_update_callback_ = std::move(callback);
+    {
+        lock_guard<mutex> lock(mutex_);
+        user_update_callback_ = std::move(callback);
+    }
+    subscribeEvent({EVENT_ACTIVE_SPEAKER_CHANGE, EVENT_PARTICIPANT_JOIN, EVENT_PARTICIPANT_LEAVE});
 }
 
 void Client::setOnDeskshareData(DsDataFn callback){
@@ -674,9 +681,10 @@ void Client::setDeskshareParams(const DeskshareParams& ds_params)
     media_params_.setDeskshareParams(ds_params);
 
     // If deskshare is already enabled, reconfigure with the new params
+    // Pass apply_defaults=false to avoid filling in defaults for other media types
     if (enabled_media_types_ & MediaType::DESKSHARE) {
         try {
-            configure(media_params_, enabled_media_types_, false);
+            configure(media_params_, enabled_media_types_, false, false);
         } catch (const Exception& e) {
             cerr << "Warning: Failed to reconfigure deskshare params: " << e.what() << endl;
         }
@@ -691,9 +699,10 @@ void Client::setVideoParams(const VideoParams& video_params)
     media_params_.setVideoParams(video_params);
 
     // If video is already enabled, reconfigure with the new params
+    // Pass apply_defaults=false to avoid filling in defaults for other media types
     if (enabled_media_types_ & MediaType::VIDEO) {
         try {
-            configure(media_params_, enabled_media_types_, false);
+            configure(media_params_, enabled_media_types_, false, false);
         } catch (const Exception& e) {
             cerr << "Warning: Failed to reconfigure video params: " << e.what() << endl;
         }
@@ -708,9 +717,10 @@ void Client::setAudioParams(const AudioParams& audio_params)
     media_params_.setAudioParams(audio_params);
 
     // If audio is already enabled, reconfigure with the new params
+    // Pass apply_defaults=false to avoid filling in defaults for other media types
     if (enabled_media_types_ & MediaType::AUDIO) {
         try {
-            configure(media_params_, enabled_media_types_, false);
+            configure(media_params_, enabled_media_types_, false, false);
         } catch (const Exception& e) {
             cerr << "Warning: Failed to reconfigure audio params: " << e.what() << endl;
         }
@@ -758,8 +768,8 @@ void Client::poll() {
 
 void Client::release() {
     int result = rtms_release(sdk_);
-    throwIfError(result, "release");
 
+    // Always clean up, even if release returned an error
     {
         lock_guard<mutex> lock(registry_mutex_);
         sdk_registry_.erase(sdk_);
@@ -774,6 +784,11 @@ void Client::release() {
     }
 
     sdk_ = nullptr;
+
+    // RTMS_SDK_NOT_EXIST means the resource was already released — that's fine
+    if (result != RTMS_SDK_OK && result != RTMS_SDK_NOT_EXIST) {
+        throwIfError(result, "release");
+    }
 }
 
 string Client::uuid() const {

diff --git a/src/rtms.h b/src/rtms.h
@@ -266,7 +266,7 @@ class Client {
 
     static void initialize(const string& ca, int is_verify_cert = 1, const char* agent = nullptr);
     static void uninitialize();
-    void configure(const MediaParams& params, int media_types, bool enable_application_layer_encryption = false);
+    void configure(const MediaParams& params, int media_types, bool enable_application_layer_encryption = false, bool apply_defaults = true);
 
     void enableVideo(bool enable);
     void enableAudio(bool enable);