LinkedIn Posts API video post body: the fields and a Python builder

A LinkedIn video post is one POST https://api.linkedin.com/rest/posts whose content.media.id is a urn:li:video: URN from the Videos API. A successful call returns 201 and the post id in the x-restli-id response header. Every call needs a Linkedin-Version header in YYYYMM form and X-Restli-Protocol-Version: 2.0.0. The page also warns that Marketing version 202510 is sunset on October 15, 2026, so send a newer version string.

Permissions and the video it points to

Posting for a company page needs w_organization_social and a page role of administrator, direct sponsored content poster or content admin. Posting as a member needs w_member_social. The video must exist first: initialize an upload, send the parts, finalize, and wait for the asset to become AVAILABLE. The Videos API lists MP4, three seconds to 30 minutes, and 75 KB to 500 MB for standard video.

If you produce the MP4 with Sume, the file comes from a finished job result rather than from the Sume API directly into LinkedIn. Sume has no LinkedIn publishing endpoint in its public docs, so the hand-off is: download the video_url, upload to LinkedIn, then post.

A builder you can run

The function below assembles the JSON body and prints it. It makes no network call, so you can diff it against the page example before wiring in a token. Replace the URN with the one your upload returned.

import json

def video_post(author, video_urn, text, title):
    return {
        "author": author,
        "commentary": text,
        "visibility": "PUBLIC",
        "distribution": {
            "feedDistribution": "MAIN_FEED",
            "targetEntities": [],
            "thirdPartyDistributionChannels": [],
        },
        "content": {"media": {"title": title, "id": video_urn}},
        "lifecycleState": "PUBLISHED",
        "isReshareDisabledByAuthor": False,
    }

print(json.dumps(video_post(
    "urn:li:organization:5515715",
    "urn:li:video:C5F10AQGKQg_6y2a4sQ",
    "Sample video Post",
    "title of the video"), indent=2))