Batch Video Rendering and Subtitle Generation in After Effects via Modular JSX Pipeline

Objective

Producing hundreds of dynamic video snippets for social media and marketing campaigns manually creates an unsustainable workload. Repetitive tasks such as importing footage, mixing audio tracks, timing subtitles, and applying branding transitions are prime targets for programmatic automation.

Goal: Create a modular ExtendScript JSX pipeline in Adobe After Effects that completely automates video production from raw JSON scripts to rendered MP4s in both 9:16 (1080x1920) and 16:9 (1920x1080) aspect ratios.

Pipeline Architecture

step0.jsx — Project initialization, cache purging, asset integrity check.

step1_import.jsx — Batch footage and image import into project bins.

step1_subtitles.jsx — Parse word-level JSON timestamps and generate animated subtitle layers.

step1_watermark.jsx — Dynamic branding and watermarking scaled to comp proportions.

step2_audio_mix.jsx — Voiceover, background music, and SFX mixing with auto-ducking.

step3_transitions.jsx — Programmatic scene transition animations.

step4_export.jsx — Render queue dispatcher and completion callback.

Key Performance Results

Throughput: A 60-second animated video is built and queued in ~45 seconds.

Scalability: Capable of parallel headless rendering via aerender CLI on dedicated nodes.

Cost Efficiency: A single script suite replaces repetitive manual editing workflows for large media catalogs.

Inquire for Custom Video Automation

For tailored automation scripts or plugins across Adobe After Effects, Premiere Pro, Photoshop, or Illustrator:

Telegram: @AlekseyBelyaev

Specialization: Media automation, ExtendScript JSX plugins, render farm clustering, REST API integrations.