Minor RTSP demo refactor

Author: Noarkhh

rtsp_to_hls/lib/pipeline.ex

@@ -10,7 +10,7 @@ defmodule Membrane.Demo.RTSPToHLS.Pipeline do
   def handle_init(_context, options) do
     spec = [
       child(:source, %Membrane.RTSP.Source{
-        transport: {:udp, options.port, options.port + 5},
+        transport: {:udp, options.port, options.port + options.port_range_size},
         allowed_media_types: [:video, :audio],
         stream_uri: options.stream_url,
         on_connection_closed: :send_eos

rtsp_to_hls/rtsp_to_hls.exs

@@ -11,6 +11,7 @@ File.mkdir_p(output_path)
 
 pipeline_options = %{
   port: rtp_port,
+  port_range_size: 5,
   output_path: output_path,
   stream_url: rtsp_stream_url,
   parent_pid: self()