Firefly Generate Music for a video vs Sume music with inspect

Adobe Firefly's Generate Music can take an uploaded video and score it from its pacing and tone. Sume's music request does not take a video: it takes a text prompt and an optional image_url. To score an existing clip on Sume, run video inspect on it, write the music brief from what you see, and pass an accepted still as the image.

Firefly details are from Adobe's community announcement; Sume details are from Music 1.0 and Video inspect.

What does Firefly do?

The post says Generate Music makes original background tracks from a text prompt describing mood, tempo, genre or instrumentation. You can also upload a video and Firefly analyzes pacing and tone to generate music to match. Generate Speech, for voiceover from a script, launched alongside it.

What does Sume take instead?

Music 1.0 accepts a text prompt and optional image conditioning, with no seed, temperature, guidance or duration parameter. The image must be a public HTTPS URL. Video inspect reads one media.sume.com clip already owned by the workspace; probe and stills are unbilled.

Inspect needs the clip on Sume first, so import it with POST /v1/media-imports if it lives elsewhere.

How do I write the brief from an inspect?

Use the Music 1.0 brief axes: emotion, genre, tempo as a number, key, two to four instruments, an arc with one named moment, and era. Take the arc from the clip's cuts and the mood from a still. The docs say these are creative directions, not guaranteed settings, so listen to the result.

Close with "Instrumental, no vocals." unless there is narration. Check first that the clip has audio you intend to keep; see reference video silent-audio check before music.

Can I match the exact video length?

Not with a parameter: duration and duration_seconds are rejected. Steer length in the prompt, for example "a 30-second track" or a [0:00-0:30] marker, then verify the audio against the clip. Mixing the track under the video is a separate step covered in add background music to a video.