The modulator bitrate depends of it's parameters, there's a nice table with the formula but i can't find it now since I'm on mobile El 5/7/2015 14:48, "Craig Barber" <[email protected]> escribió:
> Thanks for the fast response n0p but I cannot find that parameter? > > On Sun, Jul 5, 2015 at 1:34 PM, n0p [Luis Bernal] <[email protected]> > wrote: > >> The ts mux bitrate has to match the modulator's >> Avconv parameter -muxrate >> El 5/7/2015 14:11, "Craig Barber" <[email protected]> escribió: >> >>> The good news is I got it working, sort of, using channel_mhz = 8 - >>> however the picture and audio judders really badly, and basically plays >>> back really slow! I don't have a stream of UUUUUUUUUUU appearing in my >>> console window, so can't be buffer underruns, any ideas Simon? >>> >>> On Sun, Jul 5, 2015 at 12:30 PM, Craig Barber <[email protected]> >>> wrote: >>> >>>> Hi Simon, >>>> >>>> I've tried your script today with my test TV but see no signal >>>> whatsoever on the TV although the hackrf is definitely transmitting. I've >>>> also tried with a pre-recoded mpeg2 file from avconv but no luck. >>>> >>>> Any suggestions? >>>> >>>> Craig >>>> >>>> On Tue, Jun 30, 2015 at 10:57 PM, Simon Kennedy <[email protected] >>>> > wrote: >>>> >>>>> I feel slightly embarrassed as I subscribed to this list using an >>>>> email address that is redirected to my main email, so consequently replies >>>>> sent from my main email address were not coming from the correct address. >>>>> Hence, none of the replies I posted have been seen on the list. Oops! >>>>> >>>>> Here is my reply about this thread: >>>>> >>>>> Hi Craig, >>>>> >>>>> Check out Clayton's web page (who created the sdr-examples you refer >>>>> to) here <http://www.irrational.net/2014/03/02/digital-atv/> >>>>> >>>>> I amended his BladeRF script and I have put my HackRF version here >>>>> <https://www.dropbox.com/s/bdnzoa0kn01dfav/dvbt-hackrf_tx_sk.py?dl=0> for >>>>> download >>>>> My version transmits DVB-T on the lowest Freeview channel in the UK at >>>>> 474MHz (obviously only while using a dummy load). I successfully received >>>>> the transmission of my webcam image this way using an RTL-SDR dongle. >>>>> >>>>> The command I used was very heavily influenced (ok, basically copied) >>>>> from Clayton's examples: >>>>> avconv -f alsa -i hw:0,0 -f video4linux2 -s 640x480 -i /dev/video0 -vf >>>>> drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeMonoBold.ttf:text="TEST >>>>> ":x=440:y=420:fontsize=48:[email protected]:box=1:[email protected] >>>>> -vcodec mpeg2video -r 60 -b 2000000 -acodec mp2 -ar 48000 -ab 48000 -ac 2 >>>>> -mpegts_transport_stream_id 1025 -mpegts_service_id 1 >>>>> -mpegts_pmt_start_pid >>>>> 4096 -mpegts_start_pid 400 -f mpegts -y in.fifo >>>>> >>>>> I used a standard web cam to capture the image, sent the output to a >>>>> fifo file (in.fifo) and consumed the output through the python program >>>>> with >>>>> the command: >>>>> ./dvbt_hackrf_tx_sk.py in.fifo >>>>> >>>>> The fifo file can be created using the command mkfifo in.fifo >>>>> >>>>> Run the avconv command and the python program in the same directory as >>>>> you created the fifo file in. >>>>> >>>>> I have also transmitted DVB-S which I have documented on my blog here >>>>> <http://photohamrad.blogspot.co.uk/2015/06/transmitting-video-with-hackrf-blue.html> >>>>> >>>>> Simon. >>>>> >>>>> >>>>> On 30 June 2015 at 17:35, Simon Kennedy <[email protected]> >>>>> wrote: >>>>> >>>>>> Can you tell us the command you used to get this error please. >>>>>> I remember that I got a smilar error but cannot look up how I solved >>>>>> it until I get home in a couple of hours. >>>>>> The key point is that the program is trying to open a UDP port to >>>>>> receive the data and error relates to the asignment of the argument you >>>>>> supply to the program to the variable 'port' in the program. >>>>>> >>>>>> Simon. >>>>>> >>>>>> On 30 June 2015 at 16:49, Craig Barber <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> Here's the error I get: >>>>>>> >>>>>>> Traceback (most recent call last): >>>>>>> File "./dvbt-hackrf.py", line 123, in <module> >>>>>>> main(sys.argv[1:]) >>>>>>> File "./dvbt-hackrf.py", line 31, in main >>>>>>> port = int(args[0]) >>>>>>> ValueError: invalid literal for int() with base 10: 'testdvbt' >>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>> >>>>> _______________________________________________ >>>>> HackRF-dev mailing list >>>>> [email protected] >>>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >>>>> >>>>> >>>> >>> >>> _______________________________________________ >>> HackRF-dev mailing list >>> [email protected] >>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >>> >>> >
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