DATV-Express Project – November update report

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

DATV-Express Project – November update report

Post by KenW6HHC » Mon Dec 01, 2014 7:45 pm

Ken W6HHC, the “cross-training” trainee for project’s debreate builds (under the helpful and patient “trainer” Charles G4GUO) ploughed through the ODROID U3 v2.03 .DEB build for ARMhf. The ODROID software for DATV-Express was completed, tested and released on November 28.

Updated README details, a new .DEB download file for ARMhf, and a separate User Guide for ODROID (Draft04) are now all available on the DOWNLOADS page for the DATV-Express web site at:

http://www.DATV-Express.com


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Typical Block Diagram of ODROID DVB-S transmitter using DATV-Express

The DATV-Express v2.03 software for ODROID model U3 performs all the functions using the Lubuntu 14.04 LTS operating system as the larger PC with Ubuntu OS, except DVB-T performance is more limited. One of the first tests run on the ODROID U3 was to try the new 1 MHz channel bandwidth mode for DVB-T that was added in the v2.03 release of software. 1 MHz bandwidth works well. DVB-T with QPSK in the 2 MHz BW mode was also tested. But, project testing proved that one of the four ODROID CPU cores was NOT able to keep up with the required processing load for the 2 MHz BW testing. Charles G4GUO suspects that further DVB-T load-reduction improvements could possibly be done by rewriting parts of the software in assembly language (but, that assy code effort will not occur soon).

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Screen-Shot of Tutioune analyser receiving DVB-S using ODROID

Ken W6HHC also wrote an article called “Digital-ATV – Using ODROID with DATV-Express board”. This article can be found as DATVtalk12 in the free eMagazine called CQ-DATV18 that can be downloaded at:
http://www.cq-datv.mobi/ebooks.php
The article can also be found as TechTalk116 on the http://www.DATV-Express.com web site on the left side of the Home Page using the link called TECH TALK ARTICLES.

The plans for December are for the project team to relax a bit and focus on support to any questions and problems occurring from early ODROID users. The feedback from the field will help clean-up the User Guide documentation to become better.

"setting project to cruise speed"....de Ken W6HHC
Last edited by KenW6HHC on Thu Dec 04, 2014 4:27 pm, edited 3 times in total.

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

Re: DATV-Express Project – November update report

Post by KenW6HHC » Tue Dec 02, 2014 9:53 pm

When I sent out the November Report with the Tutioune screen-capture on December 01, I noticed a vertical "yellow stripe" down the middle of the video. It turns out that I had lost the "CODEC recipe" for installing CODECs for Tutioune analyzer. I was able to reconfigure the desired MPEG2 CODEC to MainConcepts Mpeg2 decoder using a tool called DSFMgr. Below is the better video rendering using the correct CODEC for Tutioune.

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Screen-capture of Tutioune Analyzer with correct CODEC receiving DVB-S using ODROID

It turned out that while playing with a different project on my Tutioune PC, a CODEC named FFDSHOW MPEG-4 had promoted itself to "top merit". Using the DSFMgr tool, I was able to "demote" the merit rating for FFDSHOW...and increase the merit rating for MainConcepts to the highest value. As shown below, now the tool GraphStudioNow shows the video decoder is the correct MainConcepts Mpeg2 CODEC.

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FILTERS graph displayed using correct MainConcepts video CODEC

73...de Ken W6HHC

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