How to turn a screen recording into a demo video
A raw screen recording is not a demo. It is the raw material for one: typically 3 to 5 times longer than the demo inside it, silent where a viewer expects pace, and narrated in audio that most players will never unmute. Five edits close that gap, and none of them need an editor timeline or a cloud upload.
1. Trim the ends
Every screen recording starts with the recorder UI and ends with a reach for the stop button. Cut to the first meaningful frame and out on the finished state. This is the highest-value edit per second spent.
2. Cut the silences
The gaps while a page loads, while you find the next button, while you think: silence detection finds them and jump cuts remove them. This is where most of the 3-5x length reduction comes from, and at demo pace the cuts read as confidence, not as editing.
3. Speed up what remains
1.2x to 1.5x on the walking-around parts keeps attention without chipmunking the audio. Typing and form-filling tolerate more. Anything the viewer must read verbatim stays at 1x.
4. Burn in captions
Demos autoplay muted on landing pages and in feeds, so narration without captions is narration nobody hears. Local transcription (whisper.cpp, no API key) generates them and they are burned into the pixels, styled, rather than shipped as a file most embeds ignore.
5. Mask what should not ship
Screen recordings of real products contain real data: keys, emails, dashboards. Mask the regions before export. Then compress; a demo that takes seconds to start playing loses the viewer it was made for.
Doing it with Vidlet
All five steps are single commands in the Vidlet CLI, or one pipeline: trim, silence removal, speed-up, local captions with four burned-in styles, region masking, and compression. It runs on your machine with FFmpeg and whisper.cpp, so the recording never leaves your device; the web app at vidlet.app does the same processing in the browser. There is also an MCP server, so an AI assistant can run the whole pipeline from a prompt. The CLI is free with no subscription.
FAQ
Do I need to re-record if my screen recording has mistakes and dead time?
No. Dead time is removed by silence detection and jump cuts, and mistakes are trimmed out. Re-recording usually produces new mistakes in new places; editing the take you have is faster and the cuts are invisible at demo pace.
Does the video have to be uploaded to a cloud service to edit it?
No. Vidlet runs locally: the CLI uses FFmpeg and whisper.cpp on your machine, and the web app processes the file in your browser. The recording never leaves your device, which matters because screen recordings routinely contain real data.
How long should a product demo video be?
Under two minutes for a landing page, under 60 seconds for social. A raw recording of the same flow is typically 3 to 5 times longer than the demo it contains; silence removal and a modest speed-up close most of that gap without cutting content.
Should captions be burned in or uploaded as a subtitle file?
Burned in, for demos. Landing pages and social feeds autoplay muted, and a separate subtitle file does nothing in an autoplaying <video> tag or an embedded tweet. Burned-in captions are the only ones every viewer actually sees.
What about API keys and customer data visible in the recording?
Mask them before publishing, not after. A blur or solid mask over the sensitive region is applied to the exported pixels, so no viewer can pause and read them. Scrubbing a published video later does not unpublish the frames people already saved.