feat: switch TTS to edge-tts en-US-GuyNeural (neutral US accent) #7

	name: Build Promo Video

	on:
	push:
	branches: [master, main]
	paths:
	- 'promo/**'
	release:
	types: [published]
	workflow_dispatch:

	concurrency:
	group: video-${{ github.ref }}
	cancel-in-progress: true

	permissions:
	contents: write

	jobs:
	render-video:
	name: Render Promo Video
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.11'

	- name: Install dependencies
	run: \|
	sudo apt-get update
	sudo apt-get install -y ffmpeg libcairo2-dev libpango1.0-dev
	pip install manim==0.18.1 edge-tts mutagen

	- name: Generate narration audio (per-segment)
	run: \|
	cd promo
	python generate_audio.py
	cat durations.json
	ls -lh *.mp3

	- name: Render synced promo video
	run: \|
	cd promo
	manim render -qh --format mp4 promo_scene.py ProductPromo

	- name: Merge video + audio
	run: \|
	cd promo
	VIDEO=$(find media/videos -name "ProductPromo.mp4" \| head -1)
	ffmpeg -y -i "$VIDEO" -i narration.mp3 \
	-c:v copy -c:a aac -b:a 192k \
	-map 0:v:0 -map 1:a:0 \
	-shortest \
	eVera_v1.0_promo.mp4
	ls -lh eVera_v1.0_promo.mp4

	- name: Upload final video
	uses: actions/upload-artifact@v4
	with:
	name: eVera-promo-video
	path: promo/eVera_v1.0_promo.mp4
	retention-days: 90

	- name: Attach to release
	if: github.event_name == 'release'
	uses: softprops/action-gh-release@v2
	with:
	files: promo/eVera_v1.0_promo.mp4
	tag_name: ${{ github.event.release.tag_name }}
	fail_on_unmatched_files: false
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Provide feedback