Lecture video: beta test evidence

Upload an English lesson, confirm its narration settings, and follow generation through delivery. Usage is sent during processing.

SP-679 · 17 Oct 2026

Status as of 17 Oct 2026

Stage: Fresh beta generation passed on 17 October. Bunny finished encoding at 100%, English captions are attached, and the instructor confirmed successful playback in Chrome.
PR: PR #544, merged at 4822512b.
Delivery fix: PR #572, streaming checksum reader. PR #573, active reservation wait.
Environment: Real beta LMS, existing Stock Market Course 1. These are live test captures, not mocked components.
Test account: Pixel Skill Developer, authorized instructor test.

Why this exists

English lessons need the correct narration language. Instructors can resolve language and timing choices before generation continues. Usage is recorded across failed and successful executions. The runner now sends each usage event in the background and retries from a local journal.

The flow

Upload

Choose the English script and slide deck.

→

Review

Confirm language and resolve timing conflicts when requested.

→

Generate

Create speech and render while usage is reported.

→

Check

Inspect the delivered video and reporting outcome.

Historical walkthrough, 15 October

Silent recording of the initial beta attempt. Waiting between generation stages is shortened. The successful fresh retest on 17 October is documented in the check table below.

How the test was run

Opened Stock Market Course 1 in the real beta LMS as Pixel Skill Developer.
Uploaded the authorized business-email English XLSX and PowerPoint files into a fresh job on 17 October.
Checked automatic English detection, selected UK English, restored US English and confirmed.
Followed speech, rendering and delivery, then checked Bunny encoding, English captions and the downloaded encoded MP4.
The instructor opened the newest video in Chrome and confirmed successful playback.
Ran 270 selected automated tests and the runner TypeScript type check. All passed.

17 October fresh run: the new video reached the course library with US English selected. This capture precedes the later caption attachment.

Checks and evidence

Check	Result	Evidence and scope
Runner tests and type check	Passed	132 runner tests passed. TypeScript type check passed.
Backend lecture-video tests	Passed	113 non-database tests and 25 database tests passed. The database tests used an isolated PostgreSQL 17 instance.
Upload and automatic language detection	Passed	Fresh job 2DvU-mF9MqEOz8UbuuRz8 accepted the English XLSX and PPTX. AI detected English and selected US English.
Instructor override	Passed	UK English was selectable. US English was restored and confirmed before speech generation.
Speech, render and delivery	Passed	Cloud execution lecture-video-runner-lspd4 completed with exit 0. The fresh video was delivered without a retry.
Usage acknowledgments	Passed	Runner exit reported pending=0, rejected=0 and outcomePending=false.
Bunny encoding	Passed	Fresh video 1fa208db-9f97-40c3-bf85-a69387a91dba reached status 4 and 100%. Duration 123 seconds; 480p, 720p and 1080p available. No transcoding messages.
English captions	Passed	Bunny lists English captions. The generated English VTT file exists.
Encoded video integrity	Passed	The fresh 480p MP4 downloaded successfully and fully decoded with FFmpeg, exit 0.
Signed embedded player request	Passed	The player returned HTTP 200 with the normal beta page Referer.
Chrome playback	Passed, manually verified	The instructor opened the newest 17 October video in Chrome and confirmed: It plays successfully. Browser automation could not render the embedded player.
Timing conflicts and delivery retry	Automated coverage	These inputs did not trigger a timing conflict or a delivery failure. Related branches are covered by automated tests; the fresh live run did not exercise them.

What the reporting result means

Each provider call creates a stable event ID. The backend accepts identical repeats without adding cost again. A final pending count of zero means the runner received acknowledgments for its queued events. It does not independently prove that provider invoices match the database ledger.

Known limits

The fresh live run passed for the supplied English lesson. This does not mean every possible input or failure path was tested live.
Browser playback was manually confirmed by the instructor. Automated browser capture could not render the embedded player. Pronunciation quality was not independently assessed.
Zero pending usage confirms acknowledgments, not independent reconciliation of invoices or database totals. Ephemeral worker replacement can still lose pending local usage.
The historical recording below is from 15 October. It is not a recording of the successful 17 October retest.

Decisions taken

Decision	Choice
Usage delivery	Send each event directly in the background, one request at a time.
Recovery	Keep a local retry journal. No R2 usage backup.
Protection	Stable event IDs, execution authentication, 600 reporting requests per execution per minute and bounded storage.

Rollout

The existing fixes are deployed to beta. This verification required no new application code, PR or deployment. Production release remains separate.