DATV-Express Project - July update report

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KenW6HHC
Posts: 309
Joined: Mon Jun 01, 2009 4:20 pm

Re: DATV-Express Project - July update report

Post by KenW6HHC » Thu Aug 06, 2015 6:39 pm

Hi Jean Pierre F6DZP,

Thank you for your feedback.

Yes, at the end of July, my testing on DatvExpressServerApp was working "OK" and I was happy to describe what settings I had used at that point in the July Report. I had not yet explored the many settings (documentation for GraphStudioNext seems missing...or perhaps it is more accurate to say that documentation seems to be missing on the MainConcept filters and other filters that I am using?).

Thank you for pointing out that the MAX value of 8000 kbps was a poor choice for VBR....I did not realize that Graph would try to push the stream up to 8000 kbps. When testing further, I could hear an occasional "clicking" in my audio output. When checking my CPU usage....I could see that at least one processor was averaging around 90% and occasionally hitting 100% (that is when the audio click would occur). I tried other values of 1400/1500MAX and they did work better...no clicks.

Later I learned that Charles G4GUO also uses the CBR mode in the video properties settings. The NULL stuffing performed by the DatvExpressServerApp only makes allowances for CPU processing delays and ensure the modulator is constantly fed... So setting the MainConcepts Video properties to CBR and video picture mode to progressive worked best of all. The CPU usage reduced down to 25%-to-42% on my notebook and no more audio clicks. My current settings are shown below.

Image


Thanks again for pointing to these areas that needed improvements.

73...de Ken W6HHC
Last edited by KenW6HHC on Sat Aug 08, 2015 2:27 pm, edited 2 times in total.

G4GUO
Posts: 729
Joined: Tue Feb 16, 2010 12:51 pm

Re: DATV-Express Project - July update report

Post by G4GUO » Sat Aug 08, 2015 10:29 am

Koert,
If you need it or want to hack it here is the server source.
I have deleted a lot of the intermediate files, hopefully it should still compile.

https://www.dropbox.com/s/v862dxxswmjgs ... c.rar?dl=0

- Charles

PA1KW
Posts: 16
Joined: Tue Dec 17, 2013 9:27 pm

Re: DATV-Express Project - July update report

Post by PA1KW » Tue Aug 11, 2015 6:28 pm

Thanks! Much appreciated!
73 Koert PA1KW

PA1KW
Posts: 16
Joined: Tue Dec 17, 2013 9:27 pm

Re: DATV-Express Project - July update report

Post by PA1KW » Sat Aug 22, 2015 7:08 pm

Hello all,
Maybe I'm missing something but where can I find the Mainconcept encoder and multiplexer? Also impossible for me to add the MajorUDPSend into GraphStudioNex??
Thanks!

73 Koert PA1KW

G4GUO
Posts: 729
Joined: Tue Feb 16, 2010 12:51 pm

Re: DATV-Express Project - July update report

Post by G4GUO » Sat Aug 22, 2015 7:20 pm

Koert,

If you have a Hauppauge card the Mainconcept files are on the WinTV disk that came with it.
You need to use regsvr32 to register the MajorUDPSender.ax file.

- Charles

PA1KW
Posts: 16
Joined: Tue Dec 17, 2013 9:27 pm

Re: DATV-Express Project - July update report

Post by PA1KW » Tue Aug 25, 2015 8:24 pm

Thanks Charles - problem was the GraphStudioNext 64bit version I was using. Switching to the 32bit version solved it and I was able to add MajorUdpSend.

Koert

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