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# helpdesks
steep-balloon-41261
11/24/2023, 4:52 AMThis message was deleted.
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fancy-wire-61616
11/24/2023, 5:16 AMWhich SDK?
a
adventurous-twilight-28575
11/24/2023, 5:24 AMI need to run that on a PI, so either Python, Go or NodeJS
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fancy-wire-61616
11/24/2023, 5:31 AMNodeJS is a pure server side SDK and does not have client (i, e. media publish/subscribe functionality).
Go SDK has client side functionality also. You can try that.
livekit-clia
adventurous-twilight-28575
11/24/2023, 6:48 AMThat’s a great hint. I was already using livekit-cli, feeding NAL units via UnixSock from Python. That worked great. But this way does not support simulcast. Will check the load tester
adventurous-twilight-28575
11/24/2023, 9:37 AMHmm. A bit confused now. I see what is happening in Go, and it seems, that the Python client SDK is not having similar "publish_simulcast_track" functionality. Is that correct?
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fancy-wire-61616
11/24/2023, 10:15 AMPython SDK is like a client. You should be able to publish simulcast. Will defer to @boundless-energy-78552 for confirmation.
a
adventurous-twilight-28575
11/24/2023, 10:45 AMIt’s a bit hard to see that there. The term simulcast is just mentioned once in the issues (unrelated). Now that I have figured out the Gstreamer pipeline for having three differently encoded (w.r.t. resolution and bitrate) H.264 streams it would be awesome to publish that as it comes out of Gstreamer to LiveKit. This would be a game changer and would make me prefer LK over Mediasoup on a longer run
adventurous-twilight-28575
11/24/2023, 10:45 AMThanks for your passion, BTW
adventurous-twilight-28575
11/24/2023, 12:29 PMDoesn't look that good...
Copy code
publication = await room.local_participant.publish_tracks([simulcast_track_720p, simulcast_track_360p, simulcast_track_180p], options)
File "/home/pi/test1.py", line 78, in main
publication = await room.local_participant.publish_tracks([simulcast_track_720p, simulcast_track_360p, simulcast_track_180p], options)
, 'LocalParticipant' object has no attribute 'publish_tracks'd
dry-elephant-14928
11/24/2023, 7:12 PM@adventurous-twilight-28575 simulcast should be enabled by default in Python.
dry-elephant-14928
11/24/2023, 7:13 PMcheck this out as an example for publishing video: https://github.com/livekit/python-sdks/blob/main/examples/publish_hue.py#L43
a
adventurous-twilight-28575
11/24/2023, 7:14 PMI have no doubt but I have some missing links. I have three preencoded streams and don’t know where to put them
adventurous-twilight-28575
11/24/2023, 7:19 PMThanks, but this example just publishes one track. I need simulcast publishing, so three tracks simultaneously
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dry-elephant-14928
11/24/2023, 7:27 PMSimulcast is a single logical track, encoded three times at different resolutions.
the encoding and resizing is handled internally
dry-elephant-14928
11/24/2023, 7:28 PMthis is typically how libwebrtc-based clients function.
Go is an exception because it doesn't handle encoding, but leaving it to the developer to pass in pre-encoded tracks.
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adventurous-twilight-28575
11/24/2023, 7:29 PMSure. Just in my case it’s me who is doing the encoding. 😀 I explained the reason and motivation in my initial thread
adventurous-twilight-28575
11/24/2023, 7:30 PMLooks like i have to “Go” then 😀
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d
dry-elephant-14928
11/24/2023, 7:30 PMI see, I didn't read the entire thread, so probably missed that detail. in that case you'd want to use the Go SDK directly. please refer to the CLI to see how it passes in simulcast tracks
dry-elephant-14928
11/24/2023, 7:31 PMyup! Go is the way to go here 😉
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adventurous-twilight-28575
11/29/2023, 10:05 AMWorks btw. Pretty good
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fancy-wire-61616
11/29/2023, 10:06 AMNice!!!