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feat: add narrated promo video pipeline (edge-tts en-US-GuyNeural)
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‎.github/workflows/video-build.yml‎

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name: Build Promo Video
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on:
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push:
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branches: [master, main]
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paths:
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- 'promo/**'
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release:
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types: [published]
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workflow_dispatch:
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concurrency:
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group: video-${{ github.ref }}
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cancel-in-progress: true
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permissions:
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contents: write
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jobs:
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render-video:
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name: Render Promo Video
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Set up Python
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uses: actions/setup-python@v5
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with:
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python-version: '3.11'
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- name: Install dependencies
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run: |
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sudo apt-get update
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sudo apt-get install -y ffmpeg libcairo2-dev libpango1.0-dev
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pip install manim==0.18.1 edge-tts mutagen
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- name: Generate narration audio
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run: |
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cd promo
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python generate_audio.py
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cat durations.json
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- name: Render synced promo video
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run: |
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cd promo
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manim render -qh --format mp4 promo_scene.py ProductPromo
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- name: Merge video + audio
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run: |
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cd promo
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VIDEO=$(find media/videos -name "ProductPromo.mp4" | head -1)
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ffmpeg -y -i "$VIDEO" -i narration.mp3 \
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-c:v copy -c:a aac -b:a 192k \
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-map 0:v:0 -map 1:a:0 \
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-shortest \
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eApps_v1.0_promo.mp4
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ls -lh eApps_v1.0_promo.mp4
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- name: Upload final video
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uses: actions/upload-artifact@v4
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with:
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name: eApps-promo-video
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path: promo/eApps_v1.0_promo.mp4
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retention-days: 90
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- name: Attach to release
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if: github.event_name == 'release'
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uses: softprops/action-gh-release@v2
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with:
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files: promo/eApps_v1.0_promo.mp4
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tag_name: ${{ github.event.release.tag_name }}
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fail_on_unmatched_files: false
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env:
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GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

‎promo/generate_audio.py‎

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"""Generate per-segment narration using edge-tts (US English neural voice)."""
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import asyncio
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import json
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import edge_tts
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from mutagen.mp3 import MP3
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VOICE = "en-US-GuyNeural"
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RATE = "+0%"
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SEGMENTS = [
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{"id": "intro", "text": "Introducing eApps. The unified marketplace and app store for EoS."},
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{"id": "f1", "text": "Feature one. 50 Apps Across 8 Platforms. Native apps, desktop apps, mobile, web PWAs, browser extensions, dev tools, CLI tools, and enterprise deployments — all in one monorepo."},
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{"id": "f2", "text": "Feature two. Automated Build and Delivery. CI/CD pipelines compile, test, and publish every app to 188 platform targets automatically."},
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{"id": "f3", "text": "Feature three. Live Marketplace. A hosted web storefront where users browse, search, and install EoS apps with one click."},
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{"id": "arch", "text": "Under the hood, eApps is built with C, TypeScript, React, and GitHub Actions. The architecture flows from App Source, to Build Matrix, to Test Suite, to Package Registry, to Marketplace."},
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{"id": "cta", "text": "eApps. Open source and ready to ship. Visit github dot com slash embeddedos-org slash eApps."}
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]
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async def generate():
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durations = {}
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audio_files = []
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for seg in SEGMENTS:
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filename = f"seg_{seg['id']}.mp3"
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communicate = edge_tts.Communicate(seg["text"], VOICE, rate=RATE)
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await communicate.save(filename)
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dur = MP3(filename).info.length
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durations[seg["id"]] = round(dur + 0.5, 1)
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audio_files.append(filename)
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print(f" {seg['id']}: {dur:.1f}s -> padded {durations[seg['id']]}s")
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with open("durations.json", "w") as f:
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json.dump(durations, f, indent=2)
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import subprocess
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with open("concat_list.txt", "w") as f:
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for af in audio_files:
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f.write(f"file '{af}'\n")
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subprocess.run([
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"ffmpeg", "-y", "-f", "concat", "-safe", "0",
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"-i", "concat_list.txt", "-c", "copy", "narration.mp3"
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], check=True)
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total = sum(durations.values())
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print(f"\nVoice: {VOICE}")
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print(f"Total narration: {total:.1f}s")
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asyncio.run(generate())

‎promo/promo_scene.py‎

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"""eApps - production promo video with synced narration."""
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from manim import *
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import json
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import os
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dur_path = os.path.join(os.path.dirname(__file__), "durations.json")
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if os.path.exists(dur_path):
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with open(dur_path) as f:
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DUR = json.load(f)
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else:
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DUR = {"intro": 4, "f1": 6, "f2": 6, "f3": 6, "arch": 7, "cta": 5}
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ACCENT = "#3b82f6"
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BG = "#0f172a"
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DARK = "#1e293b"
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class ProductPromo(Scene):
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def construct(self):
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self.camera.background_color = BG
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title = Text("eApps", font_size=96, color=WHITE, weight=BOLD)
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underline = Line(LEFT * 3, RIGHT * 3, color=ACCENT, stroke_width=4)
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underline.next_to(title, DOWN, buff=0.3)
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tagline = Text("EoS Unified Marketplace & App Store", font_size=28, color=GRAY_B)
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tagline.next_to(underline, DOWN, buff=0.4)
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techs = "C, TypeScript, React, GitHub Actions".split(", ")
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badges = VGroup()
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for t in techs:
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badge = VGroup(
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RoundedRectangle(corner_radius=0.1, width=len(t)*0.18+0.6, height=0.4,
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stroke_color=ACCENT, fill_color=DARK, fill_opacity=1),
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Text(t, font_size=14, color=WHITE),
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)
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badge[1].move_to(badge[0])
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badges.add(badge)
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badges.arrange(RIGHT, buff=0.3).next_to(tagline, DOWN, buff=0.5)
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self.play(Write(title), run_time=0.8)
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self.play(Create(underline), FadeIn(tagline, shift=UP*0.2), run_time=0.6)
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self.play(LaggedStart(*[FadeIn(b, scale=0.8) for b in badges], lag_ratio=0.1), run_time=0.6)
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self.wait(DUR["intro"] - 2.0)
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self.play(FadeOut(VGroup(title, underline, tagline, badges)), run_time=0.4)
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features = [
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("01", "50 Apps, 8 Platforms", "Native, desktop, mobile, web PWAs, extensions, dev tools, CLI, and enterprise — all in one monorepo", DUR["f1"]),
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("02", "Automated Build & Delivery", "CI/CD pipelines compile, test, and publish every app to 188 platform targets automatically", DUR["f2"]),
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("03", "Live Marketplace", "Hosted web storefront where users browse, search, and install EoS apps with one click", DUR["f3"]),
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]
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for num, feat_name, feat_desc, dur in features:
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num_text = Text(num, font_size=200, color=ACCENT, weight=BOLD, font="Monospace").set_opacity(0.08)
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num_text.to_edge(LEFT, buff=0.5)
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feat_title = Text(feat_name, font_size=48, color=WHITE, weight=BOLD)
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feat_title.to_edge(UP, buff=1.5).shift(RIGHT * 0.5)
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bar = Rectangle(width=6, height=0.05, color=ACCENT, fill_opacity=1)
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bar.next_to(feat_title, DOWN, buff=0.2, aligned_edge=LEFT)
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desc_text = Paragraph(feat_desc, font_size=22, color=GRAY_B, line_spacing=1.2, alignment="left").scale(0.9)
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desc_text.next_to(bar, DOWN, buff=0.4, aligned_edge=LEFT)
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if desc_text.width > 10:
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desc_text.scale(10 / desc_text.width)
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diagram = VGroup(RoundedRectangle(corner_radius=0.15, width=4, height=2.5, stroke_color=ACCENT, stroke_width=1, fill_color=DARK, fill_opacity=0.5))
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for row in range(3):
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for col in range(4):
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dot = Dot(radius=0.04, color=ACCENT).set_opacity(0.3 + row*0.2)
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dot.move_to(diagram[0].get_center() + RIGHT*(col-1.5)*0.6 + DOWN*(row-1)*0.5)
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diagram.add(dot)
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diagram.to_edge(RIGHT, buff=1).shift(DOWN * 0.3)
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grp = VGroup(num_text, feat_title, bar, desc_text, diagram)
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self.play(FadeIn(num_text), Write(feat_title), GrowFromEdge(bar, LEFT), run_time=0.7)
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self.play(FadeIn(desc_text, shift=UP*0.2), FadeIn(diagram, scale=0.9), run_time=0.6)
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self.wait(dur - 1.7)
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self.play(FadeOut(grp), run_time=0.4)
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arch_label = Text("Architecture", font_size=20, color=GRAY_B)
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arch_label.to_edge(UP, buff=0.6)
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components = ["App Source", "Build Matrix", "Test Suite", "Package Registry", "Marketplace"]
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boxes = VGroup()
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for comp in components:
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box = VGroup(
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RoundedRectangle(corner_radius=0.12, width=2.2, height=1.0, stroke_color=ACCENT, fill_color=DARK, fill_opacity=1, stroke_width=2),
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Text(comp, font_size=16, color=WHITE),
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)
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box[1].move_to(box[0])
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boxes.add(box)
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boxes.arrange(RIGHT, buff=0.4)
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arrows = VGroup()
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for i in range(len(boxes) - 1):
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arr = Arrow(boxes[i].get_right(), boxes[i+1].get_left(), color=ACCENT, buff=0.08, stroke_width=2, max_tip_length_to_length_ratio=0.15)
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arrows.add(arr)
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flow_dots = VGroup()
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for arr in arrows:
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for t in [0.3, 0.5, 0.7]:
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dot = Dot(radius=0.03, color=ACCENT).set_opacity(0.6)
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dot.move_to(arr.point_from_proportion(t))
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flow_dots.add(dot)
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self.play(FadeIn(arch_label), run_time=0.3)
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self.play(LaggedStart(*[FadeIn(b, shift=UP*0.3) for b in boxes], lag_ratio=0.12), run_time=0.8)
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self.play(LaggedStart(*[GrowArrow(a) for a in arrows], lag_ratio=0.1), run_time=0.5)
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self.play(LaggedStart(*[FadeIn(d, scale=0) for d in flow_dots], lag_ratio=0.05), run_time=0.4)
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self.wait(DUR["arch"] - 2.4)
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self.play(FadeOut(VGroup(arch_label, boxes, arrows, flow_dots)), run_time=0.4)
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cta_name = Text("eApps", font_size=72, color=WHITE, weight=BOLD)
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cta_line = Line(LEFT*2, RIGHT*2, color=ACCENT, stroke_width=3)
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cta_line.next_to(cta_name, DOWN, buff=0.3)
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cta_url = Text("github.com/embeddedos-org/eApps", font_size=22, color=ManimColor(ACCENT))
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cta_url.next_to(cta_line, DOWN, buff=0.3)
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cta_badge = Text("Open Source | Apache 2.0 | Production Ready", font_size=16, color=GRAY_B)
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cta_badge.next_to(cta_url, DOWN, buff=0.3)
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star = Text("Star us on GitHub", font_size=18, color=YELLOW).set_opacity(0.8)
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star.next_to(cta_badge, DOWN, buff=0.4)
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self.play(Write(cta_name), Create(cta_line), run_time=0.7)
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self.play(FadeIn(cta_url, shift=UP*0.2), run_time=0.4)
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self.play(FadeIn(cta_badge), FadeIn(star), run_time=0.4)
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self.wait(DUR["cta"] - 1.9)

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