Turn a list of HTML slides + narration into a narrated MP4. Headless-browser screenshots, pluggable text-to-speech, ffmpeg stitching. Bring your own slide design and voice.
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slidecast
Turn a list of HTML slides + narration into a narrated MP4.
You bring the slide design — any HTML you like — and the words. slidecast screenshots each slide with a headless browser, narrates it with a pluggable text-to-speech provider, and stitches the frames into one MP4 with ffmpeg. It has no opinion about how your slides look and no hard dependency on a specific voice or browser: every piece is swappable.
Install
pip install slidecast # core (requests only)
pip install slidecast[playwright] # default renderer (headless Chromium)
pip install slidecast[gtts] # Google Translate TTS
pip install slidecast[ffmpeg] # bundled ffmpeg binary (no system install)
After installing the Playwright extra, fetch the browser once:
playwright install chromium
You also need ffmpeg — on PATH, via $SLIDECAST_FFMPEG, or the [ffmpeg]
extra's bundled binary.
Library
from slidecast import Reel, KokoroTTS
reel = Reel(width=1280, height=720, tts=KokoroTTS(voice="af_heart"))
reel.add("<!doctype html><h1>Hello</h1>", "Hello, and welcome.")
reel.add("<!doctype html><h1>Goodbye</h1>", "Thanks for watching.", tail_pad=0.8)
reel.render("out.mp4", make_poster=True)
A slide with empty narration becomes a silent hold (min_duration seconds). When
the TTS provider reports a clip duration, the segment is padded to fit the speech
exactly; when it can't (e.g. MP3), the audio drives the length.
CLI
slidecast render reel.yaml -o out.mp4 --poster
width: 1280
height: 720
fps: 25
tts:
provider: kokoro # kokoro | gtts | silent
url: http://127.0.0.1:8021/v1/audio/speech
voice: af_heart
response_format: wav
slides:
- html_file: intro.html
narration: "Before any of this, here's why it matters."
tail_pad: 0.8
- html: "<!doctype html><h1>Step one</h1>"
narration: "" # silent slide
min_duration: 3
The swappable pieces
Text-to-speech — anything with synthesize(text, path) -> seconds | None:
KokoroTTS— any OpenAI-compatible/v1/audio/speechendpoint (Kokoro, OpenAI, LocalAI, …). Defaults to WAV so the clip length is measurable.GTTSTTS— Google Translate TTS (gtts).SilentTTS— a silent track of a fixed length. No dependencies; the default, so a reel renders end to end with nothing configured.
Pass phonetic={r"\bSOC\b": "sock"} to rewrite how tricky tokens are spoken
without changing the on-screen text.
Renderer — a context manager exposing screenshot(html, path, *, width, height):
PlaywrightRenderer— headless Chromium, launched once per reel (default).ChromeBinaryRenderer— drive an existing Chrome/Chromium binary by path.
ffmpeg steps are exposed directly (build_segment, concat, poster) and
take an injectable runner, so you can compose your own pipeline or test command
construction without invoking ffmpeg.
License
MIT
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