The parameter value is an ISO 639-1 two-letter language code that identifies the desired caption language. The tlang parameter specifies that the API response should return a translation of the specified caption track. ttml – Timed Text Markup Language caption.If the parameter is not included in the request, the track is returned in its original format. The tfmt parameter specifies that the caption track should be returned in a specific format. The actual CMS account that the user authenticates with must be linked to the specified YouTube content owner. It allows content owners to authenticate once and get access to all their video and channel data, without having to provide authentication credentials for each individual channel. This parameter is intended for YouTube content partners that own and manage many different YouTube channels. The onBehalfOfContentOwner parameter indicates that the request's authorization credentials identify a YouTube CMS user who is acting on behalf of the content owner specified in the parameter value.

Note: This parameter is intended exclusively for YouTube content partners. This parameter can only be used in a properly authorized request. The value is a caption track ID as identified by the id property in a caption resource. The id parameter identifies the caption track that is being retrieved. All of the parameters listed are query parameters.

The table below lists the parameters that this query supports. This request requires authorization with at least one of the following scopes ( read more about authentication and authorization). Common use cases Request HTTP request GET id Authorization Quota impact: A call to this method has a quota cost of 200 units. The caption track is returned in its original format unless the request specifies a value for the tfmt parameter and in its original language unless the request specifies a value for the tlang parameter.

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