Start Composite Merge — Image Watermark - API

Mode: imageBurn a logo onto the video

videosdk

PREVIEW · composite-merge.mp4

Required

image

Default position

bottom-right

Default size

120 px wide

Start a composite-merge transcoding job and burn a logo / image watermark onto the output. The image is fetched once before the merge starts. Same endpoint as Start Composite Merge — the only difference is the watermark body parameter is set to type: "image".

HTTP method and endpoint

POST

|

https://api.videosdk.live/v2/transcodings/merge

Headers Parameters

Authorization

REQUIRED

values: YOUR_TOKEN_WITHOUT_ANY_PREFIX

This will be a JWT token generate using VideoSDK ApiKey and Secret.

Note that the token will not include any prefix such as "Basic " or "Bearer ". Just pass a token as value.

You can generate a new token by refering this Guide: Generate Auth token

Content-Type

REQUIRED

values: application/json

This is usefull for json body parameters, so that VideoSDK servers can understand that the incoming body parameter will be a JSON string.

Body Parameters

recordingIds

REQUIRED

Array of participant recordingIds to merge. Must be a non-empty array of unique IDs that belong to the requesting user.

webhookUrl

OPTIONAL

Webhook URL to receive composite-merge-started, composite-merge-completed, composite-merge-failed and composite-merge-cancelled events.

watermark.type

REQUIRED

Must be the literal string image for this variant.

watermark.image

REQUIRED

Public URL or a base64 string (with or without the data:image/png;base64, prefix). PNG / JPG.

watermark.imageConfig.position

OPTIONAL

defaultValue: bottom-right

Allowed: top-left | top-right | bottom-left | bottom-right | center.

watermark.imageConfig.margin

OPTIONAL

defaultValue: 20

Pixels from the chosen edge (>= 0). Ignored when position is center.

watermark.imageConfig.width

OPTIONAL

defaultValue: 120

Logo width in pixels. Height auto-scales to preserve aspect ratio.

watermark.imageConfig.opacity

OPTIONAL

defaultValue: 1.0

0.0 (invisible) to 1.0 (fully opaque).

POST

|

https://api.videosdk.live/v2/transcodings/merge

NodeJS

• cURL
• NodeJS
• PHP
• Python

import fetch from 'node-fetch';
const options = {
	method: "POST",
	headers: {
		"Authorization": "$YOUR_TOKEN",
		"Content-Type": "application/json",
	},
	body: JSON.stringify({
	"recordingIds": [
		"6697685c6eaaaac67ea18130",
		"6697685c6eaaaac67ea18131"
	],
	"webhookUrl": "https://www.example.com/",
	"watermark": {
		"type": "image",
		"image": "https://cdn.videosdk.live/branding/logo.png",
		"imageConfig": {
			"position": "bottom-right",
			"margin": 20,
			"width": 120,
			"opacity": 1
		}
	}
}),
};
const url= `https://api.videosdk.live/v2/transcodings/merge`;
const response = await fetch(url, options);
const data = await response.json();
console.log(data);

RESPONSE

{
  "id": "665fcf7f2abe9a2807e42700",
  "recordingIds": [
    "6697685c6eaaaac67ea18130",
    "6697685c6eaaaac67ea18131"
  ],
  "roomId": "abcd-efgh-ijkl",
  "sessionId": "6847c231fbaa8b416bc87014",
  "status": "processing",
  "task": "composite-merge",
  "startedAt": "2025-06-10T05:45:02.730Z"
}