mux mpegts stream

1. Remmaping of PIDs can be done in ffmpeg.
   fmpeg -i input -c copy -f mpegts \
   -mpegts_original_network_id 0x1122 \
   -mpegts_transport_stream_id 0x3344 \
   -mpegts_service_id 0x5566 \
   -mpegts_service_type 0x1 \
   -mpegts_pmt_start_pid 0x1500 \
   -mpegts_start_pid 0x150 \
   -metadata service_provider="Some provider" \
   -metadata service_name="Some Channel" \
   -tables_version 5 \
   sample.ts
2. Remuxing can be done via ffmpeg using [muxrate] parameter
3. Changing RTP to UDP and to RTP can be done using multicat tool https://www.videolan.org/projects/multicat.html