Sound for a video is a DFIRST skill that adds music, sound effects or a voiceover to a video of up to 60 seconds. Firsty, the DFIRST agent, watches your video, plans the sound layers for your approval, makes each layer to follow your shots, mixes it in and listens to the result. Your picture and its length do not change.
Sound effects for our 7-second billboard film: the car breaking out and driving past. No music.
The picture and its 7 seconds are untouched. The effects land on the shots: a burst as the car breaks through the billboard at 1.5 seconds and a rush as it passes the camera at 5.
Music, whooshes on the cuts and a voiceover saying “Built for every mile.” for our 20-second KINETRA reel. Plan first.
Three layers and the final mix, each with what it follows in the reel and its level. Nothing was made until the plan was approved, and the paid step asked again.
| Layer | Follows | Level | Status |
|---|---|---|---|
| Music: driving electronic, 124 bpm | Starts on the first frame, lifts at the summit shot (0:12), ends with the film | -24 LUFS under the voice | Proposal |
| Effects: 7 whooshes, 2 foot strikes | Every cut, and the shoe landing on rock at 0:04 and 0:09 | Peaks at -6 dB | Proposal |
| Voiceover: “Built for every mile.” | Starts at 0:16, ends at 0:18.4, before the film does | -16 LUFS | Proposal |
| Mix | The whole 20 seconds | -14 LUFS, peaks under -1 dB | Proposal |
Approve the plan and Firsty makes the layers. It asks once more before the paid step.
A calm English voiceover on our 10-second SOL CLUB clip: “Stay out longer. SPF 50, no white cast.”
The voice reads the words exactly as written and ends more than a second before the clip does. The picture was checked against your original and is unchanged.
“Stay out longer. SPF 50, no white cast.”
Voiceover, English, calm
Firsty follows the skill’s steps in order and stops where the choice is yours. Nothing paid starts without your yes.
Firsty watches your video and measures its length
Firsty plans the sound layers, the music style and the voiceover
You approve the plan before any sound is made
Firsty makes each layer to follow your shots and mixes it in
Asks before anything paid
Firsty listens to the result and checks your picture is unchanged
You can ask for louder or quieter music, remixed at no cost
What Sound for a video needs from you and what it hands back.
When you ask for one of these on its own, Firsty runs it with this skill.
About Sound for a video and how it fits the rest of DFIRST.
Upload the video or pick one from your Data Room or board, then say what it should sound like: upbeat music, a whoosh on each cut, a voiceover. Firsty watches it, measures its length and shows you a plan of the layers. Once you approve, it asks before the paid step, makes each layer to fit your shots and mixes them in.
Yes. Write the exact words and the language, and say how the voice should sound, such as calm or upbeat. Firsty reads your words as written, fits them so they end before the film does and mixes the voice over any music. If the words are too long for the video, shorten them first.
Up to 60 seconds, as an MP4, MOV or WebM file of up to 150 MB. That covers reels, ads and short brand films. For a longer video, cut it into parts first, or make shorts from the long video and add sound to the clips you keep.
No. Firsty works on the sound alone. After the mix it compares the result with your original, frame and length, before handing it over. If you want the picture itself changed, for a new cut or another format, that is a separate job for a video skill, not this one.
Yes. Ask for louder or quieter music and Firsty remixes the layers it already made, with your picture untouched each time. For a piece of music on its own, without a video, the AI music generator makes a track in your style and length.
Your request waits on this device until your access starts. DFIRST opens to people on the waitlist first.
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