how to implement capture of audio recording in the bucket? i need to transfer it to a different location after it's uploaded, but it's taking long time

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1. gcp 2. another gcp bucket 3. i am pollling 4. no

Thanks — this is helpful. You’re using GCP, moving between two GCS buckets, currently polling, and not using Track Egress. Below are focused steps you can take to speed up transfers and a suggested minimal architecture. Quick recommended architecture • Write recordings directly to a GCS bucket (use LiveKit Track Egress with DirectFileOutput to avoid transcoding). • Use GCS event notifications (Cloud Functions or Eventarc) to trigger a copy immediately when an object is finalized. • Perform a server-side copy between buckets (no download/re-upload) using the GCS API or `gsutil`/Storage Transfer — run the copy in the same region for best performance. Step-by-step: replace polling with event-driven bucket-to-bucket copy 1. If possible, enable LiveKit Track Egress with DirectFileOutput to write audio files (e.g., .ogg) directly into your source GCS bucket. 2. Create a Cloud Function (or Eventarc trigger) that triggers on the

google.storage.object.finalize

event for the source bucket. 3. In the function, call the GCS copy API to copy the object to the destination bucket. Example in Node.js:

const {Storage} = require('@google-cloud/storage');
const storage = new Storage();

exports.copyOnFinalize = async (event, context) => {
  const bucketName = event.bucket;
  const fileName = event.name;
  const destBucketName = 'your-destination-bucket';
  await storage.bucket(bucketName).file(fileName)
              .copy(storage.bucket(destBucketName).file(fileName));
};

1. Deploy the function in the same region as your buckets and give it minimal IAM permissions:

roles/storage.objectViewer

on source and

roles/storage.objectCreator

on destination. 2. For high throughput, allow concurrent function invocations and consider increasing function memory/CPU to speed metadata and copy operations. Alternative (large-scale / many files) • Use Storage Transfer Service or

gsutil -m cp

/

gsutil rewrite

for bulk/parallel transfers within GCP. Storage Transfer can schedule and run large transfers efficiently without moving data through your VM. Performance tips • Always use server-side copy (GCS

.copy()

or

gsutil cp

) — never download then re-upload. • Keep source and destination in same region to minimize latency and cost. • If many simultaneous files, ensure your Cloud Function concurrency and quotas are increased; use parallel copy tools for bulk workloads. • Use object naming that avoids hot-spotting (avoid too many objects with the same prefix in quick succession). If you want, I can: • Provide a full Cloud Function example in Python or Terraform deployment config. • Show the LiveKit Track Egress

DirectFileOutput

request JSON for GCS. Which would you prefer?

my main question is how to know when livekit uploaded the audio file

Thanks — you're asking how to know when Inngest has uploaded the audio file. I don't have specific Inngest docs here, so let's align on two practical, reliable approaches you can use right now and one quick clarifying question. Clarifying question • Do you already have Inngest configured to run a workflow when LiveKit egress finishes, or is Inngest the service doing the upload from a Cloud Function/worker you control? Two reliable ways to detect completion 1) Use the storage event (recommended) • Configure your destination GCS bucket to emit a

google.storage.object.finalize

event. • Have Inngest (or a Cloud Function triggered by that event) receive the event and start the downstream workflow. This is immediate and does not rely on polling or Egress-specific hooks. 2) Use LiveKit egress/webhook status (if you can) • Configure LiveKit to send an egress-complete webhook when a recording/egress finishes writing to your bucket. • Have Inngest receive that webhook (HTTP endpoint) and trigger the next workflow. That tells you LiveKit finished writing the file. Which fits your setup? • If Inngest can receive HTTP events, use LiveKit webhooks so Inngest is notified directly. • If Inngest is not directly reachable or you prefer cloud-native reliability, use GCS finalize events (Cloud Functions or Eventarc) to trigger Inngest workflows. If you tell me whether Inngest can receive webhooks directly or whether the upload is initiated by an Inngest worker you control, I’ll give the exact webhook payload or a sample Cloud Function + Inngest call you can deploy.

sorry, i want to know how to implement audio recording capture. it seems livekit is not sending an event when the recording is live

Thanks — I’ll help you implement audio recording capture and show how to reliably detect when the file is written. I’ll cover: (A) how to record audio via LiveKit Track Egress to GCS, and (B) two reliable ways to detect completion (LiveKit egress webhook or GCS finalize event). Quick question before detailed steps: are you able to receive HTTP webhooks directly (can you expose an endpoint Inngest/your service can call)? A — Record audio to GCS (use Track Egress + DirectFileOutput) 1. Use LiveKit Track Egress with

DirectFileOutput

so LiveKit writes the raw audio file (Opus/.ogg) directly to your GCS bucket without transcoding. Example request JSON:

{
  "room_name": "your-room",
  "track_id": "TR_AUDIO_TRACK_ID",
  "file": {
    "filepath": "recordings/{track_id}.ogg",
    "gcs": {
      "bucket": "your-source-bucket",
      "path": "",
      "credentials": "{...}"
    }
  }
}

1. Start egress using the CLI or HTTP API: • CLI:

lk egress start --type track request.json

• HTTP/Twirp: POST to

.../livekit.Egress/StartTrackEgress

with your JSON and auth header. B — Detect when the recording/upload is finished Option 1 — LiveKit egress webhook (if LiveKit is configured to send egress events) • Configure LiveKit webhooks to send egress-complete events to an HTTP endpoint you control. The egress-complete webhook indicates LiveKit finished writing the file to your bucket. • When you receive that webhook, trigger your transfer or downstream processing immediately (no polling needed). • If you want, I can provide the exact webhook payload example to parse (tell me if you need JSON schema). Option 2 — GCS object finalize event (recommended if LiveKit webhooks aren’t available or reliable) • Enable a

google.storage.object.finalize

trigger on the source bucket. • Have that trigger call a Cloud Function, Eventarc, or Pub/Sub subscriber which then: ◦ Performs a server-side copy to the destination bucket using the GCS

.copy()

API (no download/re-upload). ◦ Or notifies Inngest / your workflow runner to start processing. • Example Node.js Cloud Function handler:

const {Storage} = require('@google-cloud/storage');
const storage = new Storage();

exports.copyOnFinalize = async (event) => {
  const bucketName = event.bucket;
  const fileName = event.name;
  const destBucket = 'your-destination-bucket';
  await storage.bucket(bucketName).file(fileName)
               .copy(storage.bucket(destBucket).file(fileName));
};

Why use GCS finalize events? • It signals the object is finalized and safe to copy. • It’s immediate, avoids polling, and decouples you from LiveKit internals. C — Troubleshooting LiveKit not sending a “recording live” event • LiveKit sends egress-complete when the egress finishes writing to storage. If you don’t see any event: ◦ Confirm you started egress with a proper

file/gcs

DirectFileOutput config. ◦ Confirm LiveKit webhook configuration is set and reachable. ◦ Confirm LiveKit successfully wrote the file to the bucket (check bucket for the object name/path). • Meanwhile, using GCS finalize events guarantees you’ll know when the object is available even if LiveKit webhooks are missed. Next steps — tell me: • Can you receive webhooks? (Yes/No) • Do you want the exact LiveKit egress StartTrackEgress JSON for GCS and the sample egress webhook payload? I’ll then provide the precise request JSON and webhook payload (or a Cloud Function + Inngest example) tailored to your setup.

• If you want, I can provide the exact webhook payload example to parse (tell me if you need JSON schema).

yes pls

Thanks — below is the exact

egress_ended

webhook payload example and a minimal parsing checklist so you can detect when LiveKit has finished writing the audio file. Example webhook payload (POST body)

{
  "event": "egress_ended",
  "egressInfo": {
    "egress_id": "EG_XXXXXXXXXXXX",
    "room_id": "RM_YYYYYYYYYYYY",
    "room_name": "my-room",
    "status": "EGRESS_COMPLETE",
    "started_at": 1717000000,
    "ended_at": 1717003600,
    "duration": 3600,
    "output": {
      "gcp": {
        "bucket": "my-bucket",
        "filename": "recordings/my-audio-recording.ogg"
      }
    },
    "error": ""
  },
  "id": "evt-12345678-1234-5678-9abc-def012345678",
  "created_at": 1717003600
}

Minimal parsing checklist • Verify HTTP method and signature (validate auth header / JWT if you have webhook signing enabled). • Confirm

event === "egress_ended"

. • Confirm

egressInfo.status === "EGRESS_COMPLETE"

(successful upload). If

status

is other values (e.g.,

UPLOAD_FAILED

,

LIMIT_REACHED

), treat as error. • Read the storage location from `egressInfo.output`: ◦ For GCS the path is at

egressInfo.output.gcp.bucket

and

egressInfo.output.gcp.filename

. ◦ For S3 it appears under

egressInfo.output.s3.bucket

/

key

. • Optionally use

egressInfo.egress_id

,

started_at

,

ended_at

, and

duration

for logging/tracing. • If

egressInfo.error

is non-empty, handle as failure. If you’d like, I can provide: • A sample Node.js/Express webhook handler that validates the request and extracts the GCS file path, or • The exact LiveKit StartTrackEgress JSON you should use to write

.ogg

audio to GCS. Which would you prefer? Sources: Webhooks | LiveKit docs | server-sdk-ruby | livekit/livekit_composite | DeepWiki | Quotas and limits | LiveKit docs | Track egress | LiveKit docs