# YouTube Data API . thumbnails

## Instance Methods

Uploads a custom video thumbnail to YouTube and sets it for a video.

### Method Details

`set(videoId, media_body=None, onBehalfOfContentOwner=None, media_mime_type=None)`

    Uploads a custom video thumbnail to YouTube and sets it for a video.

    Args:
      videoId: string, The videoId parameter specifies a YouTube video ID for which the custom video thumbnail is being provided. (required)
      media_body: string, The filename of the media request body, or an instance of a MediaUpload object.
      onBehalfOfContentOwner: string, Note: This parameter is intended exclusively for YouTube content partners.

    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. This parameter is intended for YouTube content partners that own and manage many different YouTube channels. 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. The actual CMS account that the user authenticates with must be linked to the specified YouTube content owner.
      media_mime_type: string, The MIME type of the media request body, or an instance of a MediaUpload object.

    Returns:
      An object of the form:

        {
        "eventId": "A String", # Serialized EventId of the request which produced this response.
        "items": [ # A list of thumbnails.
          { # Internal representation of thumbnails for a YouTube resource.
            "default": { # A thumbnail is an image representing a YouTube resource. # The default image for this resource.
              "url": "A String", # The thumbnail image's URL.
              "width": 42, # (Optional) Width of the thumbnail image.
              "height": 42, # (Optional) Height of the thumbnail image.
            },
            "high": { # A thumbnail is an image representing a YouTube resource. # The high quality image for this resource.
              "url": "A String", # The thumbnail image's URL.
              "width": 42, # (Optional) Width of the thumbnail image.
              "height": 42, # (Optional) Height of the thumbnail image.
            },
            "medium": { # A thumbnail is an image representing a YouTube resource. # The medium quality image for this resource.
              "url": "A String", # The thumbnail image's URL.
              "width": 42, # (Optional) Width of the thumbnail image.
              "height": 42, # (Optional) Height of the thumbnail image.
            },
            "maxres": { # A thumbnail is an image representing a YouTube resource. # The maximum resolution quality image for this resource.
              "url": "A String", # The thumbnail image's URL.
              "width": 42, # (Optional) Width of the thumbnail image.
              "height": 42, # (Optional) Height of the thumbnail image.
            },
            "standard": { # A thumbnail is an image representing a YouTube resource. # The standard quality image for this resource.
              "url": "A String", # The thumbnail image's URL.
              "width": 42, # (Optional) Width of the thumbnail image.
              "height": 42, # (Optional) Height of the thumbnail image.
            },
          },
        ],
        "kind": "youtube#thumbnailSetResponse", # Identifies what kind of resource this is. Value: the fixed string "youtube#thumbnailSetResponse".
        "etag": "A String", # Etag of this resource.
        "visitorId": "A String", # The visitorId identifies the visitor.
      }