A Membrane Element for demuxing an MP4.

The MP4 must have fast start enabled, i.e. the moov box must precede the mdat box. Once the Demuxer identifies the tracks in the MP4, new_tracks_t/0 notification is sent for each of the tracks.

All the tracks in the MP4 must have a corresponding output pad linked (Pad.ref(:output, track_id)).

Element options

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

• optimize_for_non_fast_start?

  boolean()

  Default value: false
  When set to true, the demuxer is optimized for working with non-fast_start MP4 stream (that means - with a stream, in which the :moov box is put after the :mdat box) You might consider setting that option to true if the following two conditions are met:

  • you are processing large non-fast_start MP4 files
  • the source of the stream is a "seekable source" - currently the only possible option is to use a Membrane.File.Source with seekable?: true option.

  When set to false, no optimization will be performed, so in case of processing the non-fast_start MP4 stream, the whole content of the :mdat box will be stored in memory.

  Defaults to false.

Pads

:input

Accepted formats:

%RemoteStream{type: :bytestream, content_format: content_format} when content_format in [nil, MP4]

:output

Accepted formats:

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

%Membrane.H264{stream_structure: {:avc1, _dcr}, alignment: :au}

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

%Membrane.Opus{self_delimiting?: false}