Interface Fmp4Track

An AAC track's AudioSpecificConfig, read.

An H.264 track's parameter sets and NAL length size.

The track's codec as RFC 6381 writes it, such as 'avc1.42c01f' (from avcC) or 'mp4a.40.2' (from esds). undefined for a sample entry this reader does not know.

The sample duration the init's trex box gives the track's fragments, in its timescale, used when a fragment gives none of its own. undefined when the init gives none (or gives 0).

The sample flags (sample_flags) the init's trex box gives the track's fragments; undefined when none (or 0).

The sample size (bytes) the init's trex box gives the track's fragments; undefined when it gives none (or 0).

The track's handler (hdlr): 'vide' for video, 'soun' for audio, or another four-character code.

A video track's height in pixels, from its sample entry.

The track's timescale (mdhd): how many units of the track's media time make a second. Its fragments' sample durations count in these units. undefined when the mdhd box is missing or says 0.

The track's id (tkhd), which its fragments refer to.

A video track's width in pixels, from its sample entry.