when embedding a video i notice in the dashboard the embed link contains a '?poster=' what is this p
when embedding a video i notice in the dashboard the embed link contains a '?poster=' what is this poster? i cannot seem to find it in the docs
/thumbnail/ path also documented on there and the ?poster= you can customise which frame of the video is shown, or supply any other arbitrary image url
https://customer-<CODE>.cloudflarestream.com/<TOKEN>/captions/en. https://customer-<CODE>.cloudflarestream.com/<VIDEO_UID>/captions/en will return a 401 with signed URLs enabled.https://api.cloudflare.com/client/v4/accounts/<ACCOUNT_ID>/stream/direct_upload with the Authorization: Bearer <API_TOKEN> headeren.vtt file just contains text "401 unauthorized". 

video.m3u8 audio1.m3u8 audio2.m3u8master.m3u8 to sync everything.






moov atom should be at the front of the file (Fast Start)
H264 progressive scan (no interlacing)
H264 high profile
Closed GOP{
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