No sound in the generated video: checking audio options in Seedance 2.0 requests

If your Seedance 2.0 video has no sound, verify that metadata.generate_audio is enabled when you submit the task via POST /v1/video/generations. Audio is controlled through this metadata field, not the top-level prompt. Also confirm your request succeeded, because failed or errored requests are never billed and never return a video url. Provide any audio reference tracks through metadata.content[], then poll GET /v1/video/generations/{task_id} until the status is succeeded.

Enable audio through the generate_audio field

To produce sound, set generate_audio inside the request metadata when calling POST /v1/video/generations. RelayDance uses an OpenAI-compatible protocol, so the request body accepts model, prompt, seconds, and a metadata object that carries options such as ratio, resolution, generate_audio, callback_url, and content[]. According to the official relaydance.com/docs docs, 「Set base_url to https://relaydance.com/v1 and keep your OpenAI SDK」, so the same SDK you already use can pass these audio parameters. Clips can run up to 15 seconds per request. If generate_audio is omitted or disabled, the returned clip will play without a track, which is the common cause of silent output. See https://relaydance.com/docs for the full field reference.

Attach reference audio in metadata.content[]

Provide audio reference tracks through the metadata.content[] array, the same channel used for reference images and videos. Each request accepts up to 9 reference images, 3 reference videos, and 3 audio tracks. Reference media are cited from the prompt using tokens @image1 to @imageN. If you intended a specific soundtrack but hear nothing, confirm the audio entries are present in content[] and that the request was accepted. According to the official relaydance.com docs, 「Failed or errored requests are never billed」, which means a silent or missing result can also indicate a failed task rather than a billing charge. Poll GET /v1/video/generations/{task_id} until the status is succeeded or failed to confirm the outcome.

Steps to check a silent Seedance 2.0 result

Follow these steps to diagnose missing sound in a Seedance 2.0 clip.

1. Confirm base_url is https://relaydance.com/v1 and your Authorization: Bearer YOUR_API_KEY header is set (create keys at https://relaydance.com/console).
2. Verify generate_audio is enabled inside the metadata object of your POST /v1/video/generations body.
3. Check that any audio tracks (up to 3) are listed in metadata.content[].
4. Poll GET /v1/video/generations/{task_id} until status is succeeded or failed.
5. If the status is failed, re-submit; note that failed requests are not billed.

Seedance 2.0 pricing reference

Seedance 2.0 billing is pay-as-you-go and priced per second, which is useful when adjusting seconds and resolution alongside audio settings. The table below lists current per-model rates; live figures are published at https://relaydance.com/models.

Because failed or errored requests are never billed, retrying a silent result after enabling generate_audio does not add cost for the failed attempt.

FAQ

Why does my Seedance 2.0 video have no sound? The most common reason is that generate_audio was not enabled in the metadata object of the POST /v1/video/generations request.

How many audio tracks can I attach per request? You can include up to 3 audio tracks in metadata.content[], along with up to 9 reference images and 3 reference videos.

Am I charged if the request fails and returns no audio? No. According to relaydance.com, failed or errored requests are never billed.