wip try to enhance error handling

src/frontend/src/features/rooms/livekit/components/effects/EffectsConfiguration.tsx

@@ -201,10 +201,23 @@ export const EffectsConfiguration = ({
          *
          * We arrive in this condition when we enter the room with the camera already off.
          */
-        const newProcessorTmp = BackgroundProcessorFactory.getProcessor(config)!
-        await toggle(true, {
-          processor: newProcessorTmp,
-        })
+        try {
+          const newProcessorTmp =
+            BackgroundProcessorFactory.getProcessor(config)!
+          await toggle(true, {
+            processor: newProcessorTmp,
+          })
+        } catch (error) {
+          reportError('effects_processor_failure', error, {
+            context: 'Error applying effect while enabling camera:',
+          })
+          saveProcessorConfig(undefined)
+          try {
+            await toggle(true)
+          } catch {
+            // Camera errors are handled by the toggle's own error path.
+          }
+        }
         setTimeout(() => setProcessorPending(false))
         return
       }
@@ -246,6 +259,14 @@ export const EffectsConfiguration = ({
         reportError('effects_processor_failure', error, {
           context: 'Error applying effect:',
         })
+        try {
+          if (videoTrack.getProcessor()) {
+            await videoTrack.stopProcessor()
+          }
+        } catch {
+          // Best effort: the processor may already be broken.
+        }
+        saveProcessorConfig(undefined)
       } finally {
         // Without setTimeout the DOM is not refreshing when updating the options.
         setTimeout(() => setProcessorPending(false))

src/frontend/src/features/rooms/livekit/hooks/useJoinTracks.ts

@@ -22,10 +22,12 @@ import { VOICE_AUDIO_CONSTRAINTS } from '../utils/constants'
 import {
   saveAudioInputDeviceId,
   saveAudioInputEnabled,
+  saveProcessorConfig,
   saveVideoInputDeviceId,
   saveVideoInputEnabled,
   userChoicesStore,
 } from '@/stores/userChoices'
+import { reportError } from '@/features/analytics/telemetry'
 import { useSyncTrackDeviceId } from './useSyncTrackDeviceId'
 
 // Module-level: effect dependencies, must be referentially stable.
@@ -221,15 +223,31 @@ export function useJoinTracks(): {
     [audioDeviceId]
   )
 
-  const createVideo = useCallback(
-    () =>
-      createLocalVideoTrack({
+  const createVideo = useCallback(async () => {
+    const processor =
+      BackgroundProcessorFactory.fromProcessorConfig(processorConfig)
+    if (!processor) {
+      return createLocalVideoTrack({ deviceId: videoDeviceId })
+    }
+    try {
+      return await createLocalVideoTrack({
         deviceId: videoDeviceId,
-        processor:
-          BackgroundProcessorFactory.fromProcessorConfig(processorConfig),
-      }),
-    [videoDeviceId, processorConfig]
-  )
+        processor,
+      })
+    } catch (error) {
+      // A camera problem (permission, device missing/busy) is not the
+      // effect's fault: let the normal media error handling deal with it
+      // without touching the user's saved effect.
+      if (getMediaDeviceFailure(error as Error)) {
+        throw error
+      }
+      reportError('effects_processor_failure', error, {
+        context: 'Restoring saved effect failed, retrying without it',
+      })
+      saveProcessorConfig(undefined)
+      return createLocalVideoTrack({ deviceId: videoDeviceId })
+    }
+  }, [videoDeviceId, processorConfig])
 
   const audioTrack = useLocalTrack({
     ready: audioReady,