Best trailer tools for Codex game devs

What actually costs money

That split is the whole planning problem. The temptation with generated video is to try to make the model produce the finished trailer; the cheaper and better approach is to buy individual shots and assemble them yourself, because assembly is free and shots are not.

One shot, one bed, one mix

Two paid runs — the shot and the music — and one free step. The bed came from the music guide session and was trimmed to the shot's length with a short fade at each end; that trim is the kind of thing worth asking for explicitly, because a bed that ends abruptly is the most obvious tell in an amateur cut.

How to plan the shot list

1. Write the beats before you generate anything

   Six to eight shots for a minute of trailer. Each one gets a sentence describing a single movement. A beat that needs two things to happen is two shots, not one prompt.

2. Draft the whole thing at the cheapest tier

   Eight five-second shots come to $2.80 for 40 s at $0.07 per second (480p) for a complete rough cut. Watch it end to end before spending anything on quality — half the beats will change.

3. Re-render only the survivors

   Once the cut works, send the shots you kept back through a higher tier or a different model. The prompts are already written, so this pass is money rather than effort.

4. Generate longer than you need

   Trimming is free, extending is another run. A seven-second render that you cut to four is cheaper than discovering the shot ends one beat too early.

What generated shots are bad at

They cannot show your game. A generated ridge at sunset is atmosphere, not footage, and a trailer built only from atmosphere tells a player nothing about what they will be doing. The honest structure for an indie trailer is generated shots for the opening mood and the closing beat, real gameplay capture in the middle, and a title card you made yourself. Anyone can tell the difference, and pretending otherwise reads badly on a store page.

They are also unreliable about specifics. A named character, a logo, a UI element, on-screen text — all of these come back wrong or invented, which is why the shot above is a silhouette on a ridge rather than a close-up of the character from our character sheet. Use generation for wides, weather, landscapes, and abstract motion; use your own art for anything a player is supposed to recognise.

The order that keeps the budget small

Do the sound before the pictures. A music bed sets the length and the rhythm of a trailer, and cutting shots to a bed you already have is far easier than scoring a cut you have already locked. One music run gives you two candidates for a single charge, so you can choose the pace before spending anything on video. If there is narration, generate that next, because the words decide how long the middle section has to be.

Then generate the shots, at the cheapest tier, in the order the trailer plays. Watching a rough cut in sequence tells you which beats are missing far better than reading a shot list does, and at draft prices a whole extra pass costs less than one high-resolution shot. Only when the cut works should you spend on quality — and even then, the last thing to add is the title card, because that is the part most likely to change after someone else sees it.

Running the assembly from Codex

Codex can hold the shot list, run the generations in order, and drive ffmpeg for the cut and the mix; what it cannot do is render a frame or a note. The Skill installed with the CLI adds video generation, music and sound, and voice generation to the same session, priced per run, with every file landing in your project.

Set it up once

npm install --global @actionway/cli@latest
actionway init
mkdir -p "$HOME/.codex/skills"
cp -R "$HOME/.actionway/skill/actionway" "$HOME/.codex/skills/actionway"

You need Node.js 20 or newer and an Actionway account. Claude Code users copy the same folder into ~/.claude/skills/actionway instead, and both routes reach the same catalog and the same wallet — the get started page lists the steps per client side by side.