Ralph, good to hear that you were able to stream with DVB-T.
BTW, Clayton used DVB-T to stream video for several miles and he put it on his
blog: http://www.irrational.net/2014/03/02/digital-atv/
You may find it useful.
Bogdan
On Thursday, April 9, 2015 12:46 PM, "Ralph A. Schmid, dk5ras"
<[email protected]> wrote:
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div.yiv0015152668WordSection1 {}#yiv0015152668 Short update: I was able to
transmit my own stream now, audio stuttered a bit, but for sure I will find out
how to fix this. It was a short iPhone video of a snake in front of our office
(we do not have so much snakes here in Germany), and it was fun seeing this
transmitted via DVB-T :) Ralph. From: Bogdan Diaconescu
[mailto:[email protected]]
Sent: Wednesday, April 8, 2015 5:13 PM
To: Ralph A. Schmid, dk5ras; 'Ron Economos'; [email protected]
Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hi Ralf, having Us when moving the
mouse does not looks good. Can you show a picture taken with htop (on Linux).
the coding is a setting of the transmitter and receiver and it just need to be
the same on both. It does impact the maximum bitrate of the stream as in the
table. Look into the 4.5.4 and 4.5.5 chapters. It says that reference
information is sent at "boosted" power level with imaginary equal zero. This is
what you see in the two dots on left and right. Bogdan On
Wednesday, April 8, 2015 5:34 PM, "Ralph A. Schmid, dk5ras" <[email protected]>
wrote: Hi, The Us are when I do something else with the machine. They do not
show when I keep my fingers off the mouse, so no reason to worry, it runs for
ages without a single U when the machine is kept alone.
I already found out about the rate. The coding also needs to be reflected by
the transport stream, or just regarding the bitrate? I did not find a setting
for that, but I will look deeper into it during the next days, when I find some
time. My first test trying to set identical settings like from the working test
stream brought just a black picture. Another question...when looking into the
constellation, what are the two dot clouds on the X/I-axis, outside the
expected 4*4 cloud matrix? Some embedded BPSK? I could not find this in the
DVB-T specs at first glance... Ralph. From: Bogdan Diaconescu
[mailto:[email protected]]
Sent: Wednesday, April 8, 2015 2:57 PM
To: Ralph A. Schmid, dk5ras; 'Ron Economos'; [email protected]
Subject: Re: [Discuss-gnuradio] DVB-T/T2 Hi Ralph, DVB-T.png shows some u's on
the command line which means the whole flowgraph do not provide data to USRP at
the right speed. It basically mean the computer cannot cope with the required
processing requirement. As for the video parameters, in the DVB-T specs
(http://www.etsi.org/deliver/etsi_en/300700_300799/300744/01.06.01_60/en_300744v010601p.pdf)
you will find Table 17 where the rates are presented. FYI, the settings you
have used are 8Mhz bandwidth, QAM-16 constellation, coding 1/2, guard interval
1/32. The video should be constant bit rate but it is not a hard requirement
(see below). If you just broadcast video from a file and not plan to use a live
streaming from camera, the rate should not matter too much. The video is sent
at the rate of the DVB-T according to it's parameters and with RTL2832 receiver
it is buffered and played at the correct speed (at least for short files like
test.ts). Bogdan On Wednesday, April 8, 2015 11:55 AM, "Ralph A. Schmid,
dk5ras" <[email protected]> wrote: Yep, this would be quite useful!
Bogdan, as you are here, too - I don't know very much about all the crazy video
file stuff, but maybe you can give me some basic parameters I need to comply
with for a transport stream, to be able to transmit it with your package?! I
need to use Windows for the conversion, as my Linux installation is only on a
virtual machine, with limited space and power. A capable looking Windows
program is available, but there are so many options I have no clue about :( I
modified your flow graph according to Rons hints, and now I have a stable and
reliable DVB-T transmission path with your package. See
http://dk5ras.dyndns.org/tmp/DVB/ with a screenshot. I am using the Ettus B210,
and for reception a second PC with DVB-T stick, or a DVB-x tester that does
them all, DVB-C/S/S2/T/T2. You and Ron really did a great job with coding
those DVB-x packages! Ralph. From:
[email protected]
[mailto:[email protected]] On Behalf Of Bogdan
Diaconescu
Sent: Wednesday, April 8, 2015 8:01 AM
To: Ron Economos; [email protected]
Subject: Re: [Discuss-gnuradio] DVB-T/T2 Ok, it would be useful to have
receivers too like for the DVB-T. Bogdan On Tuesday, April 7, 2015 11:23 PM,
Ron Economos <[email protected]> wrote: Only transmitter implementations for
now. They are here:
https://github.com/drmpeg/gr-dvbs2
https://github.com/drmpeg/gr-dvbt2
The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and
MISO processing.
RonOn 04/07/2015 06:38 AM, Bogdan Diaconescu wrote:
Hi Ron, I have not followed the development of DVB-T2/S2 lately. Are there
receiver implementations for the T2/S2 or just transmitters? Thanks,Bogdan On
Tuesday, April 7, 2015 1:32 PM, "Ralph A. Schmid, dk5ras" <[email protected]>
wrote: Great to hear that you work finds its way into the official thing! At
the moment, as the RF stuff works, I am trying to learn about all this crazy
video file stuff, for being able to create transport streams with my own
content. Up to now I am still testing with the cartoon .ts :) Still my laptop
(with DVBViewer software) will not decode the audio, while the DVB tester
decodes audio just fine. Ralph.
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