app.bsky.video.startUpload

#main

Start a multipart video upload. The declared size is exact, while optional media properties are advisory and used only for early failure; the authoritative probe runs asynchronously after upload.

Input

• Encoding: application/json

Property	Type	Known Values	Required	Description
sizeBytes	integer	-	✅	Exact byte size of the complete upload-ready video file before it is split into parts.
mimeType	string	-	✅	Declared MIME type of the video.
name	string	-	❌	Optional client-provided file name.
durationMs	integer	-	❌	Advisory, non-authoritative duration used only for early failure; the authoritative probe runs asynchronously after upload.
width	integer	-	❌	Advisory, non-authoritative width used only for early failure; the authoritative probe runs asynchronously after upload.
height	integer	-	❌	Advisory, non-authoritative height used only for early failure; the authoritative probe runs asynchronously after upload.

Output

• Encoding: application/json

Property	Type	Known Values	Required	Description
jobId	string	-	✅	-
partSizeBytes	integer	-	✅	-
partCount	integer	-	✅	-
expiresAt	string (datetime)	-	✅	-