@type t() :: %ExMP4.SampleMetadata{
  dts: integer(),
  duration: integer(),
  offset: integer(),
  pts: integer(),
  size: integer(),
  sync?: boolean(),
  track_id: integer() | nil
}

Sample metadata struct.

• track_id - The track id of the sample.
• dts - The decoding time of the sample in track timescale units.
• pts - The presentation (compoistion) time of the sample in track timescale units.
• sync? - Indicates wether the sample is a sync or rap (random access point).
• duration - The duration of the sample in track timescale units.
• size - The size of the sample.
• offset - The offset of the sample in the container.