[Hackrf-dev] DVB-T and DVB-T2

[n0p [Luis Bernal]]

The ts mux bitrate has to match the modulator's
Avconv parameter -muxrate
El 5/7/2015 14:11, "Craig Barber" <radiocraig28 at gmail.com> 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 <radiocraig28 at gmail.com>
> 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 <simon at thekennedys.info>
>> 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:fontcolor=white at 0.6:box=1:boxcolor=black at 0.4
>>> -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 <simon at thekennedys.info> 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 <radiocraig28 at gmail.com> 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
>>> HackRF-dev at greatscottgadgets.com
>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>>>
>>>
>>
>
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