# Bilibili Video Subtitle Details API

> Returns subtitle data for a specified Bilibili video based on its video ID and CID. Helps retrieve available caption tracks and related metadata.

Source: https://www.sandbase.ai/model/bilibili/web/video-subtitle
API reference: https://www.sandbase.ai/model/bilibili/web/video-subtitle/docs

## Facts

- Provider: Bilibili
- Type: Data API
- Endpoint: `POST https://api.sandbase.ai/v1/api/bilibili/web/video-subtitle`
- Price: $0.0015 per call
- Free allowance: 100 calls per organization per UTC day, shared across eligible APIs
- Capabilities: api, bilibili
- Billing: pay per use from one SandBase balance; no provider account or subscription needed

## Call it

`POST https://api.sandbase.ai/v1/api/bilibili/web/video-subtitle` with `Authorization: Bearer $SANDBASE_API_KEY` and the parameters as a JSON body.

| Parameter | Type | Required | Allowed values |
| --- | --- | --- | --- |
| `a_id` | string | yes |  |
| `c_id` | string | yes |  |

## FAQ

### How do I use the Bilibili Video Subtitle Details API?

Send a POST request to https://api.sandbase.ai/v1/api/bilibili/web/video-subtitle with your SandBase API key in the Authorization header (Bearer) and the parameters as a JSON body. You can also try it in the Playground on this page without writing code.

### How much does the Bilibili Video Subtitle Details API cost?

$0.0015 per call. Every organization gets 100 free calls per UTC day, shared across eligible SandBase APIs including this one; after that each call is billed at this price from your SandBase balance. There is no subscription.

### What parameters does the Bilibili Video Subtitle Details API accept?

Required: a_id (string) and c_id (string). The Parameters table and the Playground on this page list every field.

### What does the Bilibili Video Subtitle Details API return?

A JSON response returned in the same HTTP request (synchronous).

### Do I need a Bilibili developer account or API key?

No. Bilibili Video Subtitle Details runs through SandBase, so one SandBase API key covers this endpoint and every other API and model in the catalog. You do not need to apply for Bilibili API access separately.

## README

### Bilibili Video Subtitle Details API

Retrieve subtitle information for a Bilibili video by providing the video ID in `a_id` and the specific part CID in `c_id`.

#### Use cases

- Extract caption tracks for video transcription and translation workflows.
- Display synchronized subtitles in custom video players.
- Inspect available subtitle languages and formats for a given video clip.

#### Request

```bash
curl -X POST "https://api.sandbase.ai/v1/api/bilibili/web/video-subtitle" \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"a_id": "114006081739452", "c_id": "28400484458"}'
```

#### Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `a_id` | string | Yes | Video id |
| `c_id` | string | Yes | Video cid |

#### Notes

- Both `a_id` and `c_id` are required to pinpoint the exact video part.

#### Related APIs

- [Bilibili Streaming Areas](/model/bilibili/web/all-live-areas): Returns the complete list of streaming broadcast areas and categories on Bilibili.
- [Bilibili BV to AID Converter](/model/bilibili/web/bv-to-aid): Converts a Bilibili BV identifier to its corresponding numeric AID value.
- [Bilibili User Collection Folders](/model/bilibili/web/collect-folders): Returns the collection folders owned by a specific Bilibili user.