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type AudioVariant struct {
	MapInput        string           // The map value: in the form of $input:$stream
	Codec           string           // Codec to use, or "copy". Required.
	Type            AudioVariantType // Required (for naming purposes)
	Bitrate         *string          // Optional
	ConvertToStereo bool             // If true, this variant is downsampling Surround to Stereo

	// M3U8 Playlist options: https://tools.ietf.org/html/draft-pantos-http-live-streaming-23
	GroupID        *string        // Optional group ID. "audio" will be used if `nil`
	Name           string         // Unique name for variant. Required.
	Language       input.Language // Primary language https://tools.ietf.org/html/rfc5646
	DescribesVideo *bool
}

type AudioVariantType int

type SubtitleVariant struct {
	InputURL    string // The stream URL where the subtitle should be found
	StreamIndex uint   // The stream index of the subtitle in the input from InputURL

	// M3U8 Playlist options: https://tools.ietf.org/html/draft-pantos-http-live-streaming-23
	Name            string  // Unique name for variant. Required.
	GroupID         *string // Optional group ID. "subtitles" will be used if `nil`
	HearingImpaired bool
	Forced          bool
	Language        input.Language // Primary language https://tools.ietf.org/html/rfc5646

	// A unique output index for the subtitle file.
	// Each subtitle variant should have its own.
	OutputIndex uint
}

type VideoVariant struct {
	MapInput   string  // The map value: in the form of $input:$stream
	Codec      string  // Codec to use, or "copy". Required.
	CRF        *int    // Optional. CRF Value.
	Profile    *string // Optional
	Level      *string // Required if `Profile` is provided.
	Bitrate    *string // Optional
	AddHVC1Tag bool    // Add tag `-tag:v hvc1`
	// Associated Media
	AudioGroup    *string // Optional Audio Group
	SubtitleGroup *string // Optional Subtitle Group
	// M3U8 Playlist options
	Resolution       string // Resolution for variant in M3U8 playlist
	Bandwidth        string
	ResolutionHeight *int // Optional. To use as -filter:v scale="trunc(oh*a/2)*2:HEIGHT"
}