Instantiate a standard metadata object, populate the desired variables, and set the metadata object on the Media Heartbeat object.
Video:
standardMetadata = {}
standardMetadata[ADBMobile().MEDIA_VideoMetadataKeySHOW] = "sample show"
standardMetadata[ADBMobile().MEDIA_VideoMetadataKeySEASON] = "sample season"
standardMetadata[ADBMobile().MEDIA_VideoMetadataKeyEPISODE] = "sample episode"
mediaInfo[ADBMobile().MEDIA_STANDARD_MEDIA_METADATA] = standardMetadata
Audio:
standardMetadata = {}
standardMetadata[ADBMobile().MEDIA_AudioMetadataKeyARTIST] = "sample artist"
standardMetadata[ADBMobile().MEDIA_AudioMetadataKeyALBUM] = "sample album"
standardMetadata[ADBMobile().MEDIA_AudioMetadataKeyLABEL] = "sample label"
mediaInfo[ADBMobile().MEDIA_STANDARD_MEDIA_METADATA] = standardMetadata
See the comprehensive list of video metadata here: Audio and video parameters