ReSample RTP Audio data over Socket as PCM data using FFMPEG

Question

I want to receive a RTP Stream and send the raw data received in it over TCP / UDP socket. For this i am trying following commands.

I am sending the RTP stream using following command.

ffmpeg -re -i hello.wav -ar 8000 -f mulaw -f rtp rtp://127.0.0.1:1234
Receiver to re transmit the stream over TCP / UDP socket.

ffmpeg -i rtp://127.0.0.1:1234 -f mulaw tcp://127.0.0.1:5555 -hide_banner
A Player to play this Socket stream to verify.

ffplay tcp://127.0.0.1:5555?listen

My second command shows that its receiving data and transmitting the data to tcp over 5555 port.

Input #0, rtp, from 'rtp://127.0.0.1:1234':
  Duration: N/A, start: 0.000000, bitrate: 64 kb/s
    Stream #0:0: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_mulaw (native) -> pcm_mulaw (native))
Press [q] to stop, [?] for help
Output #0, mulaw, to 'tcp://127.0.0.1:5555':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #0:0: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
    Metadata:
      encoder         : Lavc58.54.100 pcm_mulaw

But the third command does not receive anything, even i tried dumping the response into a file using FFMPEG in command three but same results.

What am i doing wrong, Please suggest the correct commands using FFMPEG.

"Please suggest the correct commands to achieve the same using FFMPEG." You are using ffmpeg. What's the actual question? This is too vague to answer. — llogan

GJ. GJ. · Accepted Answer · 2020-02-05T09:37:31

Following three commands worked for me.

ffmpeg -re -i music.wav -ar 8000 -f mulaw -f rtp rtp://127.0.0.1:1236
ffmpeg -i rtp://127.0.0.1:1236 -f wav tcp://127.0.0.1:1256
ffplay tcp://127.0.0.1:1256?listen -ar 8000

I am able to send file as RTP, convert it to raw wav and send it over socket and then play it from that socket.

ReSample RTP Audio data over Socket as PCM data using FFMPEG

1 Answers