My third hackathon win in four months started with one missing sentence...

PunchLyne just won the engineering track at the Austin AI Film Festival’s Global GenJam tech hackathon with Machine Cinema. I developed the web app in less than 24 hours and shipped it live.

The idea came directly from the kind of problem I think about as a technical creator on TikTok. You finish recording a video. You have the footage, the delivery, and the edit. Then you realize you never said a required keyword… One sentence is missing from an otherwise finished video.

If a brand brief requires you to say a particular phrase, putting it in the caption doesn’t fulfill that spoken requirement. Recording again means another take, potentially another setup, and more editing. A small omission creates more work than it should. That was the problem I chose for the hackathon.

PunchLyne lets you upload the finished video and enter the missing keyword. It generates a short clip of you saying a sentence with that phrase, then attaches the clip to the end. Your original video stays untouched.

That became the whole product: add the sentence you forgot, while preserving the video you already made.

The technical workflow combines sentence generation, speech generation, lip-sync, and video assembly. Texel’s lip-sync technology makes the creator’s mouth match the newly generated speech. Its video encoder joins that short clip to the original footage.

The challenge was connecting those capabilities into a web app with a clear beginning and end. Someone should be able to understand the problem, upload a video, supply the keyword, and see the result.

That is also where my experience making content helped. I could approach the product from the creator’s side: what needs fixing, how much work someone has already done, and how little additional work they should have to do.

Global GenJam ran October 8–10, with engineering and filmmaking tracks. I entered PunchLyne in the engineering competition. Rahul Sheth announced the win today, and Aaron Sanchez posted the announcement on Discord.

This makes three hackathon wins in four months.

The first was Factory Guardian, which tied for first place at the Antler × Zapdos Labs hackathon in June. I built an industrial AI safety prototype that analyzed camera footage, logged observations, and sent alerts.

The second was TickyTalky, our first-place team build at the AITX Community × NVIDIA Claw Agent Hackathon. That product approached another creator problem: using a creator’s posting history to help plan what to make next.

PunchLyne starts later in that workflow. The video has already been recorded. It needs one final addition.

I like the discipline these competitions impose. You have to choose a problem, decide what fits the deadline, build the software, deploy it, and explain it clearly enough for someone else to understand. Every extra feature competes with getting the main workflow finished.

For PunchLyne, keeping that workflow small helped me ship it in less than 24 hours.

I’m proud of the win. I’m also glad the product came from connecting two parts of my own work: building software and making videos.

Thank you to Aaron Sanchez, Rahul Sheth, Chase with Cannon Studio, Machine Cinema, and the Austin AI Film Festival.

I’ve put the product screenshots, demo, technical breakdown, and win announcement together here:

See the PunchLyne build on CodexDeus (https://www.codexdeus.co

m/hackathons/punchlyne)