Whether a components.VideoSample contains a keyframe (also known as a sync sample or IDR).
A keyframe in this sense must be decoder re-entrant: a decoder must be able to start
decoding the stream from this sample alone, with no prior decoder state.
Not every intra-coded frame qualifies. Some codecs have intra-only frames that may
still reference existing decoder state and are therefore not valid sync points.
See components.VideoCodec for the codec-specific definition of a keyframe.
Rerun datatype
Arrow datatype
Boolean