DATV-Express Project

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dk9sas
Posts: 3
Joined: Sat Jun 02, 2018 7:57 pm

Re: DATV-Express Project

Post by dk9sas » Sun Jan 27, 2019 7:19 pm

G4GUO wrote:
Sun Jan 27, 2019 11:44 am
At low bitrates the H.262 encoder crashes that is what you are probably seeing. Try H.264

The only way to transmit a loop or pre-recorded video is to use vMix as an input to Express.
You can then use all vMix's features. The basic version of vMix is free but only supports SD (Standard Definition).
Other alternatives:
- ManyCam (look for version 4.1.2, where the ManyCam logo can be turned off), SD only
- Even better: https://obsproject.com with Virtual cam plugin

I'd recommend OBS: Full HD is possible - Overlays, multiple sources, PiP, switching scenes, etc. works like a treat - many tutorials on e.g. YouTube.

73, Sascha

G8DKC
Posts: 259
Joined: Thu Jun 28, 2012 9:39 am

DATV-Express Video and Audio inputs

Post by G8DKC » Tue Jan 29, 2019 8:44 am

Can someone help with the way DATV-Express sees available inputs.

On this laptop, the usual vMix list, Unreal MMS Client Source, VhMultiCam, Laptop Camera and Axis Q7401 RTSP Streamer.

I'm playing with FFmpeg.exe writing various batch files (stealing code from various web articles) :)

Is there a way to get a FFmpeg.exe as a Capture Device, running a batch file etc.

Peter

G4GUO
Posts: 665
Joined: Tue Feb 16, 2010 12:51 pm

Re: DATV-Express Project

Post by G4GUO » Tue Jan 29, 2019 9:27 am

As a DirectShow Video capture filter

- C

G8DKC
Posts: 259
Joined: Thu Jun 28, 2012 9:39 am

Re: DATV-Express Project

Post by G8DKC » Tue Jan 29, 2019 12:52 pm

Thanks Charles,

Right on the nail. :)

Peter

KenW6HHC
Posts: 306
Joined: Mon Jun 01, 2009 4:20 pm

Re: DATV-Express Project

Post by KenW6HHC » Sun Feb 03, 2019 2:57 pm

Art WA8RMC reports that inventory of MiniTiouner-Express, the DATV receiver/analyzer, is now getting low at the end of January (around 15 units have not been ordered). The project team made a decision to manufacture another batch of 100 units. Art ordered the long-lead-time blank PCB’s before he left for vacation. Art is escaping from the “polar vortex” weather by enjoying the sun shine in Florida. Shipments of MiniTiouner-Express units “outside the European Union” will be delayed until after he gets back on February 8.

Charles G4GUO received another box of 15 each units after he reported being out of distribution inventory on Jan 04. However, the shipment was quickly sold out and once again has completely sold out of the EU stock. Another batch of 15 each units were shipped off to Charles during January and are expected to clear UK customs in a week or so.

Ken W6HHC finished revising the MiniTiouner-Express User Guide (draft 16) to describe the new power supply options available with the addition of J3 in RevB version of the MiniTiouner-Express unit.
Image
Block Diagram of MiniTiouner-Express hardware set-up that allows a J3 jumper to determine what power supply to use.

The latest MiniTiouner-Express User Guide is now available at
www.DATV-Express.com on the DOWNLOADS page.

Charles G4GUO has received and set-up a 1.8 meter dish for talking with the Es'hail-2 DATV satellite. He can successfully receive the nearby BADR4 satellite. Charles is trouble-shooting the prototype of his 250-watt 2.4 GHz power amplifier design. The first prototype board would only output about 80 W of RF.

Project Speed is set to slow….de Ken W6HHC

KenW6HHC
Posts: 306
Joined: Mon Jun 01, 2009 4:20 pm

Re: DATV-Express Project

Post by KenW6HHC » Sun Mar 03, 2019 3:48 pm

Art WA8RMC reports that all inventory of MiniTiouner-Express, the DATV receiver/analyzer for DVB-S/DVB-S2, has now been exhausted with all available units being shipped to UK for distribution. The PayPal order rate jumped for one-or-two per week, to two-or-three per day after the OSCAR-100 satellite was turned on. Art has received long-lead-time blank PCB’s and DigiKey components are starting to come in for assembling the PCBs. The Chinese celebrations have delayed the ordering of the Serit NIM Tuners and the tuners will not be received until the end of March. Art expects that MiniTiouner-Express units will be available for shipment again, sometime in April.

Charles G4GUO received yet another box of 15 each units on March 01 for EU stock. However, each unit already had a buyer-placed order waiting for it. The “final” batch of 5 each units were shipped off to Charles during February and are expected to clear UK customs in another week or so.

Charles G4GUO has been having many successful DATV QSOs with the Es'hail-2 OSCAR-100 DATV satellite. Most are RB-DATV with most being 250 KSymb/s of 333 KSymb/s. With a symbol rate of 250 KSymb/s, Charles can hit the OSCAR-100 with only 10W output of DATV RF power using his 1.8-meter dish antenna. An SR of 1 MSymb/sec requires about 30W. Charles explained to the project team that – “every evening OSCAR-100 is very very busy”.

Charles’s home station consists of:
1) MiniTiouner-Express RX
2) DATV-Express TX board
3) Express Transmitter software for Windows.
4) self-designed 2.4 GHz RF Power Amp (using MRF7S24250) currently delivering up to 130W of CW output power.
5) 1.8-meter dish antenna with dual-band-feed for 2.4 GHz uplink and 10 GHz downlink.
.
Image
DATV Video received by G4GUO from G4BAO using OSCAR-100.

Image
Side view of G4GUO Dual-Band-Feed for OSCAR-100 antenna.

Image
G4GUO’s 1.8-M dish antenna for using OSCAR-100.


Project Speed is set to slow….de Ken W6HHC

G4GUO
Posts: 665
Joined: Tue Feb 16, 2010 12:51 pm

Re: New release of Express software

Post by G4GUO » Sat Mar 23, 2019 3:12 pm

https://www.dropbox.com/s/l7iedd092c93z ... 4.zip?dl=0

Provided you keep the transmit queue below 10% most of the time this should work better.
There is still an issue with dropped frames when using h.265 but if I try and fix that I will
probably never release any new software.


- Charles

KenW6HHC
Posts: 306
Joined: Mon Jun 01, 2009 4:20 pm

Re: DATV-Express Project

Post by KenW6HHC » Tue Apr 02, 2019 4:13 am

Art WA8RMC reports that he is “in the middle of” testing of MiniTiouner-Express PCBAs, the DATV receiver/analyzer for DVB-S/DVB-S2. All parts had been received except the NIM tuners. The Chinese celebrations and small manufacturing issues have delayed the shipping of the Serit NIM Tuners and the tuners will not ship to Art until April 03. It will take another 2 or 3 weeks for units to reach Art. Art expects that MiniTiouner-Express units will be available for shipment again, sometime in May.

Charles G4GUO has released an updated version of the Express DVB Transmitter software for Windows, v1.25LP.14. The new update improves the software timing of the PCR/PTS/DTS timestamps for H.262 and H.264 CODECs. When transmitting, make sure the TX queue level remains below 10% (if it starts to climb, your transport stream will become non-compliant). However, the current v1.25LP.14 implementation created a small problem with H.265 dropping frames. Charles reports that he understands the new H.265 problem…and will try to fix the software.
Art was having some intermittent video during his recent MiniTiouner-Express PCBA testing…and the new v1.25LP.14 software corrected the problem.

Jean-Pierre F6DZP has released a new MiniTioune software version, v0.9-beta, for MiniTiounerPro or BATC MiniTiounerV2 units. The new software adds more preset buttons for Symbol Rates and Transmitting Freq buttons. So far, the beta software has not been made compatible with MiniTiouner-Express hardware units. Charles G4GUO confirms that v0.9-beta is NOT yet compatible MiniTiouner-Express units… so please DO NOT UPGRADE to the v0.9-beta software with MiniTiouner-Express units. Wait for F6DZP to do a full-release of the v0.9 MiniTioune software.

Charles G4GUO continues to have fun with DATV QSOs using the Es'hail-2 OSCAR-100 DATV satellite. Charles reports that the round trip of a transmitted DATV signal using O-100 takes about 6 seconds - with most of the delay consumed in the transmitting software. With a two-way QSO, the total delay runs about 12 seconds when one station turns it over to the other station.


Project Speed is set to slow….de Ken W6HHC

KenW6HHC
Posts: 306
Joined: Mon Jun 01, 2009 4:20 pm

Re: DATV-Express Project

Post by KenW6HHC » Thu Apr 04, 2019 4:07 pm

Just a quick announcement that the v1.25LP14 version of software improves the software timing of the PCR/PTS/DTS timestamps for H.262 and H.264 CODECs. The software timestamp improvement means fewer dropped video frames if the two oscillators drift apart (and out of sync)...different receivers react differently to a "missing video frame"...some receivers will freeze and NEVER recover without restarting the RX. The Windows set-up.exe file and the NOTES file are now available at www.DATV-Express.com on the DOWNLOADS page.

Many thanks to G4GUO for his continuing efforts.

73…de Ken W6HHC

F1SSF
Posts: 73
Joined: Sat Nov 25, 2017 5:14 pm

Re: DATV-Express Project

Post by F1SSF » Sun Apr 07, 2019 6:07 pm

Hi Charles, alls
I see in your last realase, you have added network parameters.
I think SOURCE /Port are IP and port for listenning UDP trafic, but GROUP ???
So, what are parameters that increase the queue? I have this problem.
Thank's for your job.
73 Franck F1SSF
Last edited by F1SSF on Sun Apr 07, 2019 6:29 pm, edited 1 time in total.

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