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Recording audio/video streams from WebRTC using Medooze Media Server and GStreamer or FFmpeg

This demo shows how to record WebRTC video stream from the browser into an MP4 file on the server using Medooze Media Server and GStreamer or FFmpeg.

Here is an overview of what is happening:

Client Webcam => Browser => Medooze Media Server => GStreamer|FFmpeg => .mp4

We are leveraging Medooze Streamer component in order to send RTP streams for external processing.

Install and run

  1. Clone this repo and cd into project directory.

  2. Install dependencies and start the server:

npm install
npm start
  1. Open https://127.0.0.1:3000 in the browser.

Recording video

  1. Press Record button for start recording.
  2. Press Stop button for stop recording.

A new file <TIMESTAMP>.mp4 will be created in the project directory.

GStreamer pipeline

Here is a quick explanation of GStreamer pipeline used in demo:

# Start GStreamer
gst-launch-1.0

# Gracefully save recording when GStreamer is shut down
--eos-on-shutdown

# Mux all streams into video.mp4 file
mp4mux faststart=true name=mux ! filesink location=video.mp4

# Listen to 127.0.0.1:5004 with payload 109 (audio)
udpsrc address=127.0.0.1 port=5004 caps="application/x-rtp,clock-rate=48000,payload=109" name=audio

# Get Opus audio from RTP and decode it to AAC
audio. ! queue ! rtpjitterbuffer ! rtpopusdepay ! opusdec ! audioconvert ! audioresample ! avenc_aac ! aacparse ! mux.

# Listen to 127.0.0.1:5006 with payload 96 (video)
udpsrc address=127.0.0.1 port=5006 caps="application/x-rtp,clock-rate=90000,payload=96" name=video

# Get H264 video from RTP
video. ! queue ! rtpjitterbuffer ! rtph264depay ! h264parse ! mux.

FFmpeg pipeline

Here is a quick explanation of FFmpeg pipeline used in demo:

ffmpeg
-protocol_whitelist file,rtp,udp # Enable input from file, RTP, UDP
-i input.sdp                     # Read SDP file with RTP connection details. See example below.
-c:a aac                         # Convert incoming audio to AAC
-c:v copy                        # Copy incoming video with no changes
-f mp4                           # Output to MP4
-y                               # Non-interactive mode (always `yes`)
video.mp4                        # Output file name

input.sdp

c=IN IP4 127.0.0.1
m=audio 5004 RTP 109
a=rtpmap:109 opus/48000/2
m=video 5006 RTP 96
a=rtpmap:96 H264/90000
a=fmtp:96 packetization-mode=1

In the actual code the SDP is created on the fly and is piped to the FFmpeg process via stdin.

License

MIT