dsh-custom-splash
A startup-screen plugin for DeepSeek Harness (DSH):
play your own video full-screen while DSH boots, then fade into the app.
中文详细说明：README.zh.md
video splash
Features
- Video mode (default) — a local MP4 covering the window, auto-fading into the app when it ends.
- Swap the video without reinstalling — drop any MP4 at
%USERPROFILE%\.dsh\startup-video\boot.mp4 (or ~/.dsh/startup-video/boot.mp4),
or point the setting at any absolute path (file or directory).
- No first-frame flash — the lock class is added synchronously in
<head> and the
black overlay is the first child of <body>, so the app never paints before the video.
- Streams with HTTP Range —
/dsh-startup/media/<file> supports 206, HEAD and
seeking, and is served with Cache-Control: no-store.
- Never hangs the boot — autoplay rejection falls back to muted + an "unmute" button;
decode errors, a 25 s watchdog and script failures all release the page immediately.
- Skippable — bottom-right skip button,
Esc, or click (after 0.9 s).
- Per-session by default — a refresh in the same tab does not replay it;
always / daily are also available.
Note: The built-in six-act interactive sequence from the upstream project is currently disabled in this v1.0.0 fork due to a DOM mounting compatibility issue. It will be restored in a future update.
Install
dsh plugin --profile web add ./dsh-custom-splash-1.0.0.tgz
On Windows, unzip the release and double-click 安装.cmd.
For DeepSeek Harness Desktop, install the .tgz through its plugin manager
(the desktop profile cannot be managed from the CLI), then fully quit from the tray
and relaunch — closing the window is not enough.
Requirements: DSH web profile or Desktop, Node >= 20, no runtime dependencies.
Uninstall:
dsh plugin --profile web remove dsh-custom-splash
Use your own video
Fastest path — overwrite one file:
%USERPROFILE%\.dsh\startup-video\boot.mp4
If that file is missing the plugin falls back to its own lib/assets/video/boot.mp4,
so deleting it never leaves you with a black screen.
Prefer another location? Settings → Startup screen → Video absolute path accepts a
file or a directory (relative paths are rejected). Leave it empty to use the bundled clip.
Encode for the browser (H.264 + yuv420p + AAC, faststart):
ffmpeg -i source.mov -vf scale=1920:1080:flags=lanczos \
-c:v libx264 -preset medium -crf 20 -pix_fmt yuv420p \
-c:a aac -b:a 192k -movflags +faststart boot.mp4
Settings
DSH Settings → "Startup screen" (labels are in Chinese).
Playback: enabled · source (video / builtin) · video absolute path · video file name ·
fit (cover / contain) · muted · volume · mode (session / always / daily) · allow skip.
Builtin sequence only: theme · speed · require confirmation · identity name/id/clearance ·
voice (on/off, source, voice, rate, pitch, volume, cue sound, intro delay) · UI sounds ·
accent and glitch colors · all copy fields.
The builtin-only fields are hidden automatically in video mode.
FAQ
- Nothing shows up — check that the "Startup screen" section exists in Settings
(otherwise the bundle is not mounted), that "Enabled" is on, and that mode is not
session with the tab already visited. On Desktop, quit from the tray.
- Video does not play — verify H.264/yuv420p/AAC, or enable "Muted" (muted autoplay is
exempt from browser autoplay policies). Failures release the page instead of hanging it.
- No sound — browsers require a user gesture before audio; a muted fallback with an
"unmute" button is provided.
- 401 from
/dsh-startup/* — expected: those routes only trust loopback requests
carrying the host's trust marker.
How it works
Host (lib/index.js)
tapIndex → <head>: critical CSS + config + EARLY_LOCK_JS
→ <body>: #dsh-startup-root overlay + BOOTSTRAP_JS (mode checks, 9 s fallback)
routes (/dsh-startup): splash.css · splash.js · boot-video.js · media/<file> · asset/<file>.mp3 · config
Browser
lib/boot-video.js overlay + <video> + skip/unmute + watchdog
lib/client.js settings panel (self-boots the overlay if the host did not inject it)
Development
npm test # four smoke suites (254 assertions)
npm run pack:release # npm pack into release/
Repo layout:
lib/index.js host half: config, injection, six routes
lib/boot-video.js video runtime (zero deps, all styles inline)
lib/splash.js builtin six-act runtime
lib/splash.css builtin six-act styles
lib/client.js settings panel
lib/assets/ audio + video assets
test/ smoke suites
preview/ offline preview page (not published)
docs/ screenshots and publishing notes
License & credits
MIT. Based on [6shenhonghong9/dsh-startup-screen]
(MIT) — the builtin six-act sequence, its styles, audio assets and copy come from there.
This fork adds the video mode, replaceable video path, first-frame flash fix and the
related settings.
