Public build · Technical case study

Video production pipeline

A public pipeline that connects script generation, voice synthesis, video assembly, thumbnails and an upload adapter.

Node.jsFFmpegMedia / OAuth APIs

01
Prepare a topic and script through distinct stages
Input and entry point
02
Generate audio with timing and visual-cue metadata
Implementation stage
03
Assemble footage, text and audio using FFmpeg
Implementation stage
04
Prepare a thumbnail and pass completed artifacts to an upload adapter
Output and operational boundary

IMPLEMENTATION EXCERPT / src/youtube_index.js

const DRY_RUN = process.env.DRY_RUN === 'true';

// … generation and media assembly run before this check
if (!DRY_RUN) {
  videoUrl = await uploadAgent.upload({
    // … completed video and metadata
  });
}

Selected implementation lines with explanatory comments. Omitted work is marked with “…”. Inspect the complete source below.

Evidence boundary

Dry run skips publishing, but generation still calls external services and sends a startup notification. It must not be described as an offline or zero-cost test.

THE PROBLEM

Where the work gets stuck.

Preparing a video crosses several tools and intermediate files. A single failed stage can leave unclear output and partial work.

Follow the implementation

Prepare a topic and script through distinct stages
Generate audio with timing and visual-cue metadata
Assemble footage, text and audio using FFmpeg
Prepare a thumbnail and pass completed artifacts to an upload adapter

Technical scope

Source review covers the stage coordinator, FFmpeg assembly and the YouTube upload adapter. The coordinator passes voice timing and visual cues into video assembly.

The decision that matters

Dry run skips publishing, but generation still calls external services and sends a startup notification. It must not be described as an offline or zero-cost test.

Inspect the evidence

Public source reviewed October 1, 2026. Pinned implementation links preserve the version reviewed. This walkthrough does not reproduce private client details.

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Video production pipeline