I’m playing around with membrane, trying to save an RTP stream from an IP camera to file. Using code from some demos I managed to get the the video stream and send it to a hls stream to make sure it works. At this point my code looks like this:

  def handle_init(opts) do
    %{audio_port: audio_port, video_port: video_port} = opts

    spec = %ParentSpec{
      children: [
        video_src: %Membrane.Element.UDP.Source{
          local_port_no: video_port,
        },
        audio_src: %Membrane.Element.UDP.Source{
          local_port_no: audio_port,
        },
        rtp: %RTP.SessionBin{
          secure?: false,
        },
      ],
      links: [
        link(:video_src) |> via_in(:rtp_input) |> to(:rtp),
        link(:audio_src) |> via_in(:rtp_input) |> to(:rtp)
      ]
    }

    {{:ok, spec: spec}, %{}}
  end

  defp handle_stream(%{video: video_ssrc, table: table}) do
    spec = %ParentSpec{
      children: %{
        video_parser: %Membrane.H264.FFmpeg.Parser{framerate: {30, 1}, alignment: :au, attach_nalus?: true},
        video_payloader: Membrane.MP4.Payloader.H264,
        video_cmaf_muxer: Membrane.MP4.CMAF.Muxer,

        hls: %Membrane.HTTPAdaptiveStream.Sink {
          manifest_module: Membrane.HTTPAdaptiveStream.HLS,
          target_window_duration: 10 |> Membrane.Time.seconds(),
          storage: %Membrane.HTTPAdaptiveStream.Storages.FileStorage{directory: "output"}
        }


      },
      links: [
        link(:rtp)
        |> via_out(Pad.ref(:output, video_ssrc))
        |> to(:video_parser)

        |> to(:video_payloader)
        |> to(:video_cmaf_muxer)
        |> via_in(:input)

        |> to(:hls)
      ],
      stream_sync: :sinks
    }

    [spec: spec]
  end

I’d like to replace the hls output and save the stream to a avi or mp4 file. Is it possible?

Thanks!