Simple ffmpeg desktop audio sharing for Ubuntu

ffmpeg-ubuntu-to-windows.txt

In this example, the client is Ubuntu, and the server is Windows.  ffmpeg will need to be installed on both.  Other scenarios will need a different command and understanding of ffmpeg.

On the "client", run the ffmpeg command:

`ffmpeg -re -f alsa -ac 2 -i default -fflags +genpts -vn -c:a pcm_s16be -sdp_file ~/sdp_stream.sdp -f rtp rtp://server:1234`

Where `server` is your barrier server IP address.  This will stream desktop audio to the specified address

(If you use pulse instead of alsa, replace `-f alsa` with `-f pulse` )

It will output sdp_stream.sdp
```
SDP:
v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 192.168.1.82
t=0 0
a=tool:libavformat 58.29.100
m=audio 1234 RTP/AVP 97
b=AS:1536
a=rtpmap:97 L16/48000/2

```

In my example the server is `192.168.1.82`

On the server machine (`192.168.1.82`), copy the SDP text above into a file `sdp_stream.sdp` and run the ffplay command:

`./ffplay -protocol_whitelist 'rtp,file,udp' .\sdp_stream.sdp`

Enjoy streamed uncompressed audio

for compressed, replace `-c:a pcm_s16b` with `-c:a libvorbis`