Hey guys, why does digital video need its own standard? On Thu, Apr 9, 2015 at 7:45 PM, Ralph A. Schmid, dk5ras <ra...@schmid.xxx> wrote: > 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:b_diacone...@yahoo.com] > Sent: Wednesday, April 8, 2015 5:13 PM > To: Ralph A. Schmid, dk5ras; 'Ron Economos'; discuss-gnuradio@gnu.org > 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" > <ra...@schmid.xxx> 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:b_diacone...@yahoo.com] > Sent: Wednesday, April 8, 2015 2:57 PM > To: Ralph A. Schmid, dk5ras; 'Ron Economos'; discuss-gnuradio@gnu.org > 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" > <ra...@schmid.xxx> 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: discuss-gnuradio-bounces+ralph=schmid....@gnu.org > [mailto:discuss-gnuradio-bounces+ralph=schmid....@gnu.org] On Behalf Of > Bogdan Diaconescu > Sent: Wednesday, April 8, 2015 8:01 AM > To: Ron Economos; discuss-gnuradio@gnu.org > 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 <w...@comcast.net> 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. > > Ron > > On 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" > <ra...@schmid.xxx> 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. > > > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > > > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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