Ad video library

Lists the ad account's video library (Meta's /act_X/advideos), rows returned verbatim. The default projection covers id, title, status, poster frames, length and source (the playable MP4); fields is a raw-passthrough override. Any id here is reusable as video.id on the create endpoints, so N ads that differ only in copy share one upload.

source lets you PLAY a video before picking it, which a poster frame alone can't settle when several videos share a first frame. It is a signed CDN URL that EXPIRES, so treat it as good for preview at selection time only — never persist it, re-list to get a fresh one.

This is the only way to reach a video uploaded OUTSIDE Zernio (Ads Manager, another tool); videos we uploaded also come back as creative.videoId on GET /v1/ads.

Meta transcodes asynchronously, so a row is only usable once status.video_status reads ready. Upload a new video via POST /v1/ads/videos, or inline via video.url on POST /v1/ads/create.