TEEIChime SDK preview

Test environment, LondonDemo personas only, no participant data

Amazon Chime SDK preview

Every room TEEI runs on Chime

TEEI holds its live sessions in 25 room formats on Amazon Chime, across 5 programmes. Open any of them as demo personas, then watch the join, the media and the events from a panel beside the room.

Control region eu-west-2, London. Media in eu-west-1, Ireland. Computed from the code when this page loads.

Start here

A booked 1:1 with captions

The whole path in one room: the join, the media, captions, the Chime events and the row the company report reads.

  1. Join as both people. One window for each demo persona, side by side.
  2. Turn on captions in both. Transcription starts only when both agree, and the panel shows the StartMeetingTranscription call.
  3. Leave, then press Settle now. The Chime events arrive, and the settled row appears the way the company report reads it.

In the panel Join · Media · Captions · Events · Settle

TEEI Language · VideoRoom

Room formats
25

in 5 programmes

Room configurations
9

formats that behave the same, merged

Room components
2

VideoRoom for 1:1, GroupVideoRoom for the rest

SDK settings changed
11

against amazon-chime-sdk-js 3.32.0

Two more to start with

Each opens a real Chime meeting in the London test account with demo personas signed in. A panel beside the room shows what happens underneath.

Skills Academy · GroupVideoRoom

A webinar where the host invites someone up

Open the host and a participant. When the host invites the participant to speak, the panel shows the UpdateAttendeeCapabilities call and Chime's answer.

In the panel Join · Capabilities · Events

TEEI Language · GroupVideoRoom

Make an event fail, then replay it

Arm the fault path and the next Chime event is refused three times. Watch it land in the dead letter queue, drain it, and see it stored.

In the panel Fault path · Events

All 25 rooms

Grouped by what Chime and the room do: who may speak, captions, host tools and video tiles. Formats that agree on all of it share a card.

Each room gets its own demo personas. A persona already in another room is never waited for: the preview signs in a fresh instance of it, same name, same portrait, its own demo account. Pressing a row again while its room has 10 minutes or more left opens the same room.

VideoRoom3 formats

One-to-one call

  • Everyone speaks
  • Captions when both agree
  • No host tools
  • 25 video tiles, Chime's limit

  • Booked 1:1 session conversation

    TEEI Language · learner, volunteer

  • Call from the chat conversation

    TEEI Language · learner, volunteer

  • Booked 1:1 session conversation

    TEEI Mentorship · learner, volunteer

CallGuestRoom on GroupVideoRoom1 format

A guest joins a 1:1 call

  • Everyone speaks
  • No captions
  • Host tools: the volunteer
  • 25 video tiles, Chime's limit

  • Guest in a 1:1 call conversation

    TEEI Language · volunteer, learner, guest

GroupVideoRoom7 formats

Group with a host, everyone speaks

  • Everyone speaks
  • No captions
  • Host tools: the host
  • 25 video tiles, TEEI's cap

  • Speaking Café conversation

    TEEI Language · volunteer, learner

  • Discussion Group conversation

    TEEI Language · volunteer, learner

  • Workshop conversation

    TEEI Language · volunteer, learner

  • Study Group conversation

    TEEI Language · volunteer, learner

  • Group mentoring conversation

    TEEI Mentorship · volunteer, learner

  • Volunteer Coffee conversation

    Volunteer Community · host, volunteer

  • Volunteer Exchange conversation

    Volunteer Community · host, volunteer

GroupVideoRoom4 formats

Group without a host

  • Everyone speaks
  • No captions
  • No host tools
  • 25 video tiles, TEEI's cap

  • Social Club conversation

    TEEI Language · learner, volunteer

  • Learner café conversation

    TEEI Language · learner

  • Peer-led Language Café conversation

    TEEI Language · learner

  • Peer practice conversation

    TEEI Language · learner

GroupVideoRoom2 formats

The host presents, the audience listens

  • The host speaks, the room mutes the audience
  • No captions
  • Host tools: the host
  • 25 video tiles, TEEI's cap

  • Workshop presentation

    TEEI Language · volunteer, learner

  • Volunteer Exchange presentation

    Volunteer Community · host, volunteer

GroupVideoRoom4 formats

A session with a moderation team

  • Everyone speaks
  • No captions
  • Host tools: host, co-host and moderator
  • 25 video tiles, TEEI's cap

  • Workshop conversation

    Skills Academy · host, co-host, moderator, speaker, participant

  • Clinic conversation

    Skills Academy · host, co-host, moderator, speaker, participant

  • Expert Q&A conversation

    Skills Academy · host, co-host, moderator, speaker, participant

  • Class conversation

    Skills Academy · host, co-host, moderator, speaker, participant

GroupVideoRoom2 formats

A stage: speakers are invited up

  • Speakers are invited up, enforced by Chime capabilities
  • No captions
  • Host tools: host, co-host and moderator
  • 25 video tiles, TEEI's cap

  • Expert Q&A presentation

    Skills Academy · host, co-host, moderator, speaker, participant

  • Webinar presentation

    Skills Academy · host, co-host, moderator, speaker, participant

MeetingRoom on GroupVideoRoom1 format

TEEI Meeting

  • Everyone speaks
  • No captions
  • Host tools: the host
  • 25 video tiles, TEEI's cap

  • Meeting conversation

    TEEI Meetings · host, guest

MeetingRoom on GroupVideoRoom1 format

TEEI Meetings webinar

  • Speakers are invited up, enforced by Chime capabilities
  • No captions
  • Host tools: the host
  • 25 video tiles, TEEI's cap

  • Webinar presentation

    TEEI Meetings · host, speaker, listener

What TEEI changes in the Chime SDK

Every room above runs with these. Compared with a bare MeetingSessionConfiguration from amazon-chime-sdk-js 3.32.0, measured when this page loads.

SettingSDK defaultTEEISet in
Video in the browser
enableSVCfalsetrueapp/lib/lc/chime-session-tuning.ts:124
videoDownlinkBandwidthPolicynone (the SDK picks at session start)VideoPriorityBasedPolicy, delay factors (0, 1), server-side adaption BandwidthProbingAndRemoteVideoQualityAdaptionapp/lib/lc/chime-session-tuning.ts:125
videoUplinkBandwidthPolicynone (the SDK picks at session start)SerialChimeVideoUplinkPolicyapp/lib/lc/chime-session-tuning.ts:126
Connection and reconnect in the browser
connectionTimeoutMs1500030000app/lib/lc/chime-session-tuning.ts:41
reconnectTimeoutMs120000300000app/lib/lc/chime-session-tuning.ts:50
reconnectLongBackOffMs50008000app/lib/lc/chime-session-tuning.ts:57
connectionHealthPolicyConfiguration.connectionUnhealthyThreshold2540app/lib/lc/chime-session-tuning.ts:68
connectionHealthPolicyConfiguration.connectionWaitTimeMs1000020000app/lib/lc/chime-session-tuning.ts:68
connectionHealthPolicyConfiguration.missedPongsUpperThreshold46app/lib/lc/chime-session-tuning.ts:68
Media in the browser
keepLastFrameWhenPausedfalsetrueapp/lib/lc/chime-session-tuning.ts:139
attendeePresenceTimeoutMs0Left at the default on purposeapp/lib/lc/chime-session-tuning.ts:141
audioVideo.setAudioProfileSDK default bitrate, mono, redundancy on40 kbit/s, mono, redundancy onapp/lib/lc/chime-session-tuning.ts:169
Set on the service side in the meeting Lambda and the room
CreateMeeting MeetingFeatures.Audio.EchoReductionUNAVAILABLEAVAILABLElambda/lc-video-session/index.ts:867
VoiceFocusDeviceTransformer specdefault modelns_es (noise and echo) when the meeting offers echo reduction, else the defaultapp/components/VideoRoom.tsx:2816
StartMeetingTranscription EngineTranscribeSettingsone fixed language, no stabilisationIdentifyLanguage, PreferredLanguage en-US, partial results stabilised (high)lambda/lc-video-session/index.ts:656

What happens under a room

The panel beside the room times each of these steps for the meeting you opened.

When someone presses Join

The Worker reports steps one to five as they happen. The browser sees step six.

  1. Who may enterThe Worker checks the booking and the role
  2. Meeting leaseThe Worker reuses or reserves the meeting
  3. Signed tokenThe Worker signs a short-lived token
  4. API GatewayThe authorizer checks the token, in London
  5. Meeting LambdaCreateMeeting and CreateAttendee in eu-west-2
  6. Media flowingThe browser reaches Chime media in eu-west-1

After the room

The same path production uses, in the London test account.

  1. Chime eventsattendee joined, left, dropped, screen share on and off, meeting ended
  2. EventBridge rulethose six types, preview meetings only
  3. Forwarderretries for up to 6 hours, then a dead letter queue
  4. Ingest and receiptthe Worker stores the event, a second rule keeps an S3 receipt
  5. Settlementevery 15 minutes, or Settle now here

What this preview cannot show

Production counts
The figures in the article count real sessions in production. The preview only has its own.
The nightly company sync
The company report reads real companies and employees. The preview shows the row the way the report reads it, with the same rule.
Production alarms and the canary
They watch the production resources. The preview has its own dead letter queue and drain, with no alarm that pages anyone.
Real networks in Ukraine
They can only be emulated, and Chrome's network throttling does not slow WebRTC media.