Re: AES67 sender pipeline options

[Jonas Licht]

Hi James,

you wrote you have something that works.
Can you share the source code, please?

Best regards
Jonas



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[James Cowdery]

Jonas,
     I do have some code that works with a limited set of receivers that I
have tried.I haven't shared it because the time-stamping is flawed and to
fix it properly requires creating a new plug-in or probe. I got distracted
on this project as Merging have open-sourced an AES67 ALSA driver so this
pretty does all I want at the moment. I can share what I did but not sure if
it is good starting point for you.
James



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[Jonas Licht]

Hi James,

ah I understood.
I also played around a little bit with AES67, so therefore I'm
interested in your approach.

But I have some Problems to get the accuracy you have reached.
After some testing the few last days, I figured out, maybe the absolute
time of PTP Clock can be the cause of my offset.

So my beginning was to use the ptp4l with a NIC included a PHC.
Then, I add a probe on my pipeline at the sink pad of the rtpL24pay and
set the timestamp-offset based on the PHC Time.
But I experienced that my timestamps was around 200ms in the future,
than the timestamps of the arriving packets of a direct attached AES67
device.
However, it could be also a device specific problem.

Jonas



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