KEYFRAMES_INFOS API Documentation

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中文版 | English

Interface Information

POST /openapi/capcut-mate/v1/keyframes_infos

Function Description

Generate keyframe information based on keyframe type, position ratios, and values. This interface converts keyframe configurations into the keyframe information format required by Jianying drafts.

Request Parameters

{
  "ctype": "KFTypePositionX",
  "offsets": "0|50|100",
  "values": "0|960|1920",
  "segment_infos": [
    {"id": "segment1", "start": 0, "end": 5000000}
  ],
  "height": 1080,
  "width": 1920
}

Parameter Description

Parameter	Type	Required	Default	Description
ctype	string	✅	-	Keyframe type: KFTypePositionX (X-axis move, needs width), KFTypePositionY (Y-axis move, needs height), KFTypeRotation (0-360), UNIFORM_SCALE (0.01-5), KFTypeAlpha (0-1)
offsets	string	✅	-	Position ratios separated by |, e.g. "0|100" (start and end) or "0|50|100" (start, middle, end)
values	string	✅	-	Values for each offset separated by |; the element count must match offsets, e.g. "1|2" or "1|2|1"
segment_infos	array[object]	✅	-	Track data array; each item has id, start, end (microseconds)
height	integer	❌	None	Video height, used to normalize KFTypePositionY values
width	integer	❌	None	Video width, used to normalize KFTypePositionX values

Response Format

Success Response (200)

{
  "code": 0,
  "message": "success",
  "keyframes_infos": "[{\"offset\":0,\"property\":\"KFTypePositionX\",\"segment_id\":\"segment1\",\"value\":0.0},{\"offset\":2500000,\"property\":\"KFTypePositionX\",\"segment_id\":\"segment1\",\"value\":0.5},{\"offset\":5000000,\"property\":\"KFTypePositionX\",\"segment_id\":\"segment1\",\"value\":1.0}]"
}

Response Field Description

Field	Type	Description
keyframes_infos	string	Keyframe information JSON string

Error Response

{
  "code": 1001,
  "message": "Parameter validation failed"
}

Usage Examples

cURL Examples

1. Basic Keyframe Information Generation

curl -X POST https://capcut-mate.jcaigc.cn/openapi/capcut-mate/v1/keyframes_infos \
  -H "Content-Type: application/json" \
  -d '{
    "ctype": "UNIFORM_SCALE",
    "offsets": "0|100",
    "values": "0.5|1.5",
    "segment_infos": [{"id": "segment1", "start": 0, "end": 5000000}]
  }'

2. Position Keyframe Information

curl -X POST https://capcut-mate.jcaigc.cn/openapi/capcut-mate/v1/keyframes_infos \
  -H "Content-Type: application/json" \
  -d '{
    "ctype": "KFTypePositionX",
    "offsets": "0|30|70|100",
    "values": "0|384|1536|1920",
    "segment_infos": [{"id": "segment1", "start": 0, "end": 10000000}],
    "height": 1080,
    "width": 1920
  }'

Error Code Description

Error Code	Error Message	Description	Solution
1001	Parameter validation failed	Request body failed schema validation (ctype/offsets/values/segment_infos missing, or offsets/values not strings)	Check parameter types and required fields
9998	Internal server error	The number of |-separated elements in offsets and values differs	Make the element counts of offsets and values identical

Notes

1. Element Matching: offsets and values must contain the same number of |-separated elements
2. Time Unit: All time parameters use microseconds (1 second = 1,000,000 microseconds)
3. Keyframe Types: KFTypePositionX, KFTypePositionY, KFTypeRotation, UNIFORM_SCALE, KFTypeAlpha
4. Position Ratios: offsets values are percentages in range 0-100, and each keyframe offset is computed relative to the segment start
5. Resolution Settings: with KFTypePositionX/KFTypePositionY, the value is divided by width/height for normalization

Workflow

1. Validate required parameters (ctype, offsets, values, segment_infos)
2. Check that offsets and values have the same number of elements
3. Validate parameter validity
4. Generate corresponding keyframe information for each offset
5. Apply resolution parameters
6. Convert information to JSON string format
7. Return processing result

Related Interfaces

• Create Draft
• Add Keyframes
• Save Draft

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📚 Project Resources
GitHub: https://github.com/Hommy-master/capcut-mate
Gitee: https://gitee.com/taohongmin-gitee/capcut-mate

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中文版 | English