insert audiowatermark to UDP multicast Live Stream

[rtpmedia]

Stefan. I am interested in your audio watermark solution.
Can it be used in live mpeg ts udp multicast broadcasting without video encoding ?
If yes, please send a description of how to do it

[swesterfeld]

If I understand your use case correctly, there is no direct support in audiowmark to do it (so there is no code to do anything for live mpeg ts / udp / multicast / broadcasting). However, what you could do is that you spawn an audiowmark add - - ... subprocess that does the watermarking on a stream of raw samples. You should then provide the input as raw samples and encode and send the output of the process using whatever method you want.

See

• https://github.com/swesterfeld/audiowmark#output-as-stream
• https://github.com/swesterfeld/audiowmark#input-from-stream
• https://github.com/swesterfeld/audiowmark#raw-streams

Here is an example of watermarking a stream using mpg123 1.25.13 and play the result using sox:

mpg123 -s song.mp3 | audiowmark add - - f0 --format raw --raw-rate 44100 | play -t raw -e signed -b 16 -r 44100 -c 2 -

[rtpmedia]

Thanks for the reply. I read this

https://github.com/swesterfeld/audiowmark#output-as-stream
https://github.com/swesterfeld/audiowmark#input-from-stream
https://github.com/swesterfeld/audiowmark#raw-streams
Clarify in your example what is

mpg123 -s song.mp3 ?

The rest is clear.

In this case, it works.

ffmpeg -threads auto -thread_type 1 -i "udp://224.0.191.78:1234?fifo_size=50000000&overrun_nonfatal=1" -f s16le -acodec pcm_s16le -ar 48000 -ac 2 -vn -sn pipe:1 | ./audiowmark add - out.wav 0123456789abcdef0011223344556677 --input-format raw --raw-rate 48000

I have udp multicast at the input and udp multicast should be at the output