A Membrane Source capable of reading streams from the MP4 file.

It requires specifying provide_data_callback - a function that will be called each time data from MP4 needs to be read. If you know in advance what kind of track you want to read from the MP4, you can link the element's Pad.ref(:output, id) (with any desired id) pad with the kind: :audio | :video option provided. Alternatively, you can spawn the element without linking its pads and wait until the tracks are resolved. Once the Demuxer identifies the tracks in the MP4, new_tracks_t/0 notification is sent with description of each of the tracks and a corresponding track_id. The parent can then link Pad.ref(:output, track_id) for desired tracks.

Element options

Passed via struct Membrane.MP4.Demuxer.DemuxingSource.t/0

• provide_data_cb

  Engine.provide_data_cb()

  Required
  A function that will be called each time the Membrane.MP4.Demuxer.DemuxingSource needs data. It should read desired number of bytes from MP4 file, starting at given position.

• start_at

  non_neg_integer()

  Default value: 0
  Specifies the decoding timestamp of the first sample that should be read from each of the tracks.

  If there is no sample with exactly such a timestamp, that sample will be the first sample with DTS greater than provided timestamp.

Pads

:output

Accepted formats:

%Membrane.AAC{config: {:esds, _esds}}

%Membrane.H264{stream_structure: {_avc, _dcr}, alignment: :au}

%Membrane.H265{stream_structure: {_hevc, _dcr}, alignment: :au}

%Membrane.Opus{self_delimiting?: false}

Pad options:

• kind

  :video | :audio | nil

  Default value: nil
  Specifies the decoding timestamp of the first sample that should be read from each of the tracks. If there is no sample with exactly such a timestamp, that sample will be the first sample with DTS greater than provided timestamp.