OBS via IPTSin on the PortsDown

Discussion about this major DATV Project. See https://wiki.batc.org.uk/The_Portsdown_Transmitter
g0mjw
Posts: 1560
Joined: Sat Sep 20, 2014 9:15 am

Re: OBS via IPTSin on the PortsDown

Post by g0mjw » Sat Apr 18, 2020 2:05 pm

What does the ffmpeg debug tell you? If you cant see it, enable it. ffmpeg -h will give you a list of commands.

It could be a whole host of things from network issues to not detecting the stream. I assume these connections are all wired and not via WiFi.

Suggestions:

Use wireshark to check the network traffic
Run a port scanner to check the ports are open
Make sure OBS is really sending UDP by receiving it with VLC

Mike

PA3GUO
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Joined: Tue Feb 18, 2020 8:55 pm

Re: OBS via IPTSin on the PortsDown

Post by PA3GUO » Sat Apr 18, 2020 3:18 pm

@G7JTT / John

John, your 250 and 333 OBS scripts work fine, could you also share your 500ks script (basic.ini) in case you have that ?
I use OBS with yr scripts, ffmpeg with your settings in the .bat file, and tested it on th eportsdown using the IPTS viewer.

Btw, there is a 4 second delay between what I see on the OBS window on the PC and what the portsdown display shows

Thanks for your excellent explainations here !!

Henk

EA3NE
Posts: 1
Joined: Sat Jul 16, 2016 11:04 pm

Re: OBS via IPTSin on the PortsDown

Post by EA3NE » Wed Jul 01, 2020 9:04 am

I have Portsdown 2020 with the latest update. It is working correctly on H265 and H264 on IPTSin with GTX1050 and OBS. But I cannot change the name of the provider or the program service, always in my transmissions it appears as a callsign "service01" instead of the callsign. I have tried scrips or pach, but am not getting it. It only works with Vmix and Vmix2PortsdownH264 scrip .... etc. But with the Vmix I get very little definition in the image, and it is not as agile as the current OBS is.
Jaume EA3NE

G7JTT
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Joined: Fri Jun 10, 2016 5:05 pm

Re: OBS via IPTSin on the PortsDown

Post by G7JTT » Wed Jul 01, 2020 12:42 pm

Hi Jaime take a look at the first post, you need to use a batch file that adds the user and service id's. Unfortunately OBS is unable to add this .

Hopefully that will sort it for you, all best John G7JTT

G0LJF
Posts: 76
Joined: Wed Dec 25, 2019 5:28 pm

Re: OBS via IPTSin on the PortsDown

Post by G0LJF » Sat Jul 18, 2020 3:39 pm

Hi,

My comment is about 250K s/s but with 1/2 error correction. 3/4 worked fine from the start.

Using that on line table gives me a bitrate of 24750 but this was not working very well with ffmpeg.

I noticed that in the ffmpeg command window the actual bitrate was more like 27500 and so I tried that.
Success. I kept the FFVBitrate=149.

That took me days to find out so perhaps it would help someone else trying to send 250 K with 1/2?

73, Mike

G0LJF
Posts: 76
Joined: Wed Dec 25, 2019 5:28 pm

Re: OBS via IPTSin on the PortsDown

Post by G0LJF » Thu Jul 23, 2020 10:52 am

Hi,

I am seeking guidance with OBS streaming to ffmpeg and then to Portsdown2020.

My setup is as per Dave's sample ffmpeg scripts (and OBS profiles). I have one configuration for 250K s/s + 1/2, one with 250K + 3/4, and one with 333K + 3/4 (as supplied, unchanged).

I am using the pthreads ffmpeg as instructed. My PC is an i5 4 core (about 50% CPU load maximum, all video applications running).

The test setup involved checking the stream with the stream viewer in Portadown2020. All was fine - video looked good.

My problem came when I up-link to Eshail2 and view the down-link on my Minitiouner Pro. The video is mostly black and does not refresh. It stutters and can work for about 5s maximum.
I suspected that MT may not be showing my video so I also (as yet another test) streamed UDP to VLC. Again, no video in VLC.

I thought I would check my up-link and down-link so I switched OSB streaming and ffmpeg off, and went back to the simple Pi Cam (V2) input to Portsdown. H264.

That all works fine at 250K and 333K for both 1/2 and 3/4 FEC via Eshail2. So the RF up-link/down-link is OK.

Please can a) someone suggest a next course of action - I am unsure what to look at next, or b) is there a good stream checking application I may use (is this is the problem).

It may well be the way I set up OBS, of course. I am combining a web cam, a series of picture stills in a slide show, and a text scroll.

Please, any guidance where to look next? Could the PC be to slow to encode at the required frame rate for example?


ta, 73, Mike

G7JTT
Posts: 255
Joined: Fri Jun 10, 2016 5:05 pm

Re: OBS via IPTSin on the PortsDown

Post by G7JTT » Thu Jul 23, 2020 11:42 am

Hi Mike if the IPTS monitor is seeing the video ok it should work? Have you tried monitoring the signal locally on the 2.4GHz uplink ? Also are there any ffmpeg errors in the ffmpeg batch file window ?

John

G0LJF
Posts: 76
Joined: Wed Dec 25, 2019 5:28 pm

Re: OBS via IPTSin on the PortsDown

Post by G0LJF » Thu Jul 23, 2020 12:39 pm

Hi John,

Many thanks for replying. No that had occurred to me too - why do I not check the 'actual' modulated RF up-link low power output from Portsdown with MT Pro?

I will try that. I also have a Pluto here too, should I need to check the spectrum, but it looked nice and narrow on the Live Tune App I use.

I don't see any ffmpeg errors apart from at 250K s/s where I had to increase the bit rate from 24750 in order to remove these lines. See above...

73, Mike

G0LJF
Posts: 76
Joined: Wed Dec 25, 2019 5:28 pm

Re: OBS via IPTSin on the PortsDown

Post by G0LJF » Thu Jul 23, 2020 1:59 pm

Hi John,

I think I must have made a mistake yesterday.
Today, it does work with both the up-link RF from Portsdown and also via Eshail2.

My only concern is I may have not changed the FEC over on Portsdown from 250 to 333 perhaps?
Or the PA was getting over-heated?

I have to use about 60-90W here, approximately. Dish is 1.1m with POTY.

I can reduce that a bit if I strip out the extra coax to the POTY, the directional coupler and the RG402 onto the POTY as that wastes over 2dB. Its still on-going this project. As they tend to be.

So all is well, but a bit hot. PA shuts-down at 46C at present (I can adjust that).

Tnx anyhow,

73, Mike

G7JTT
Posts: 255
Joined: Fri Jun 10, 2016 5:05 pm

Re: OBS via IPTSin on the PortsDown

Post by G7JTT » Thu Jul 23, 2020 3:31 pm

Great that it's now working, come join the QO100 net at 8pm tonight if you can 👍

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