Getting Started

Make sure you've added all .env vars required before proceeding

Requirements

Docker desktop
Deno curl -fsSL https://deno.land/install.sh | sh

Install dependencies

npm install

and

deno install

Serving the application

First, start the Supabase database.

npx supabase start

If this is your first time running this command, your container layers will download. This takes a second, so go grab some water - you're dehydrated.

Next, open a new terminal tab and serve your Supabase functions locally:

npx supabase functions serve

Next, open a third tab and start the Inngest queue server:

npx inngest-cli@latest dev

Finally, run the Next.js development server:

npm run dev

Open localhost:3000 with your browser to see the result.

Seeding the database

npm run mux-backfill

Create the video embeddings

This will run the createEmbedding function for each asset in our database

npm run videos-backfill-existing # All assets
npm run videos-backfill-missing  # Only assets with missing embeddings

DEV's Worldwide Show and Tell Challenge Presented by Mux: Pitch Your Projects! $3,000 in Prizes. 🎥

Jess Lee on December 03, 2025

We are so thrilled to introduce DEV's Worldwide Show and Tell Challenge presented by Mux! Running through January 4, this challenge invites you t...

Read full post

Peter Kim Frank The DEV Team • Dec 3 '25

Can't wait to see everyone's projects ⭐️

Noah Brinker The DEV Team • Dec 3 '25

Excited to see what everyone creates!

Dave Kiss • Dec 3 '25

New year, new you - let this be the year you WILL tell people about the thing you're working on 😅

sharon oliva • Dec 6 '25

I think challenges like this are great for motivation. Even if you do not win sharing your project with the dev community is valuable. I might just give it a shot!

Arsey Kun • Dec 17 '25 • Edited

Agreed

Hala Kabir • Jan 2

Yes it is....

Katie Roberts • Jan 2

do iiiittttt

Pratyay Banerjee • Jan 5

Hi everyone! 👋🏻
@mmcc we had a blast building with MUX, and we’re excited to share what we shipped: Fragments ✨

We’d love for you to check it out, watch the demo, and let us know what you think. Feedback, ideas, and contributions are more than welcome! 🚀

Gift Trust • Dec 10 '25

I have something ready for the real world developers and deployment.
It's called MODAC - Modern Day Agentic Commerce. It's a sovereign security framework designed to govern Agentic Commerce cloud atmosphere. I have the complete Algorithm backend

Arsey Kun • Dec 17 '25

Just submitted brillant Africa2G, what a good way to learn pitch, win or not, i've learned a thing or two

Stephendache • Dec 26 '25

LFG

Just submitted BrilliantAfrica2G. This is gonna be amazing win or not i have learned sth atleast

Georgel • Dec 26 '25

Where can I see other people's projects?

Ekong Ikpe • Dec 30 '25

Same question on my mind. Any luck yet seeing what others have done?

Georgel • Dec 31 '25

Here: dev.to/challenges/mux-2025-12-03

Then click View Entries

Maame Afua A. P. Fordjour • Dec 7 '25

Looking forward to see what people build! Good luck to everyone.

Bhrunten • Dec 18 '25

Can't wait to see others projects

Jess Lee The DEV Team • Dec 17 '25

💯

Ben Halpern The DEV Team • Dec 3 '25

Good luck!

Dylan Jhaveri • Dec 3 '25

Looking forward to seeing what people are hacking on over the holidays!

Jackson Kasi • Jan 2

Hello everyone, I need some help. 🙏

When I upload a 59-second video on Mux in basic quality, only 10 seconds upload, and it says it will be deleted after 24 hours.
How can I upload a full 1-minute video? I’ve tried both via code and manually, but it only lets me upload 10 seconds.

Matt McClure • Jan 2

Hey Jackson,

Looks like your account was on an old legacy plan that predated the new free plan. I just swapped you over and you should be good to go!

Jackson Kasi • Jan 2 • Edited

Thanks @mmcc it's works now!

uratmangun • Dec 4 '25

what is this Video Semantic Search - Supa Search ? is this using supabase?

Jess Lee The DEV Team • Dec 4 '25

@uratmangun here's more info:

muxinc / supasearch

View on GitHub

Joshua Alphonse • Dec 3 '25

Take a shot and show us what you got! We're eager to see how creative everyone is.

M Shaikh • Jan 5

@mmcc ,
@jess ,
I forgot to submit my app and now I have college to attend; would late submissions be considered for review? The college ends around 5 PM IST so I can submit around 6 PM... If the coordinators permit.
Thanks

Antoni Neutron • Dec 25 '25

Love this idea

Neweraofcoding • Dec 6 '25

Nice looking forward to it!

Bharathkumar • Dec 16 '25

I'm in.

Dimitar Nikolov • Jan 3

Is this only for projects that are already built or in the process of building or do they apply for ideas that the person would like to implement but hasn't already started?

Amit Joiya • Dec 16 '25

Excited ✌️✌️

Emerson Vieira • Jan 3

the link antigravity is wrong. the correct antigravity.google

TattooedLowLife • Dec 19 '25

So glad I found this!!

Ibrahim Pima • Dec 3 '25

nice to be apart of this contest

Ekong Ikpe • Dec 17 '25

With all pleasure Gnoke Station 🤞

Brett-junior Andrews • Jan 2

Can anyone tell me how to become a admin on steal a brain rot Roblox

Viktar Davidovich • Dec 4 '25

I'm in

Mumtaz Ali • Jan 2

Aloof • Dec 9 '25

I won't miss this one.

Excited to share a side project I've been working on for the first time! Started as a Christmas gift for my bf, and now he thinks I should share it. Sooo...

Destroyer • Dec 18 '25

This should be fun! :)

jackeliot • Dec 23 '25

I look forward to seeing everyone's work; I'm sure it will be amazing!

Adilson Rafael • Dec 23 '25

Let's start it

BIG One • Dec 25 '25

One question: is this only for Apple Store platforms? Is it valid for Android?

BIG One • Dec 27 '25

Fady Desoky Saeed Abdelaziz • Dec 30 '25

So excited ✨️

Sarah J. Lopez • Dec 31 '25

AssetResolute is helping victims recover back their lost or stolen cryptocurrency. Especially the recent Trust Wallet Hack Victims. Google search on their name "AssetResolute" gives you their info.