Re: [Discuss-gnuradio] gr-modtool

[CEL]

Hi Mir, 
you need to call "~/prefix/default/bin/gnuradio-companion".

If you justr call "gnuradio-companion", your shell won't know it's
supposed to look into its current directory; that's just how UNIX
shells (don't) work. Programs must either lie in $PATH or be fully
specified with their path.

Best regards,
Marcus

On Mon, 2019-02-11 at 13:05 +0000, Mir Muhammad Lodro wrote:
> Thanks for your reply. I can see the gr_modtool in the said directory. 
> However, I can't start gnuradio using 
> ~/prefix/default/bin/gnuradio-companion
> 
> When I do this it says:
> 
> address@hidden:~/prefix/default/bin$ gnuradio-companion
> Command 'gnuradio-companion' not found, but can be installed with:
> sudo apt install gnuradio
> 
> Apparently, there is no other gnuradio installation. How to know that I have 
> multiple gnuradio copies installed.
> Thanks
> Mir
> 
> On Sat, Feb 9, 2019 at 5:01 PM <address@hidden> wrote:
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> > Today's Topics:
> > 
> >    1. Re: bit stuffing DVB-S TX example ? (Alban Meffre)
> >    2. Re: bit stuffing DVB-S TX example ? (Ron Economos)
> >    3. Re: bit stuffing DVB-S TX example ? (Ron Economos)
> >    4. Re: gr-modtool (Cinaed Simson)
> > 
> > 
> > ----------------------------------------------------------------------
> > 
> > Message: 1
> > Date: Fri, 8 Feb 2019 18:59:12 +0100
> > From: Alban Meffre <address@hidden>
> > To: "Raydel Abreu (CM2ESP)" <address@hidden>
> > Cc: Ron Economos <address@hidden>,    discuss-gnuradio
> >         <address@hidden>
> > Subject: Re: [Discuss-gnuradio] bit stuffing DVB-S TX example ?
> > Message-ID:
> >         <address@hidden>
> > Content-Type: text/plain; charset="utf-8"
> > 
> > hi thanks for your answers
> > 
> > my symbol rate is 300 ksps
> > using this calculator
> > http://www.satbroadcasts.com/DVB-S_Bitrate_and_Bandwidth_Calculator.html
> > and these settings : QPSK rate 1/2 FEC frame 64800
> > i get 276.5 kbps of TS bitrate
> > 
> > here are my settings for ffmpeg :
> > *ffmpeg -re -f lavfi -i testsrc=s=640x480:r=25:n=1 -vf
> > "drawtext=text=%{localtime}:x=(w-tw)/2:y=h-th-37:fontsize=20:fontcolor=yellow:borderw=2:bordercolor=black"
> > -pix_fmt yuv420p -an -g 25  -b:v 228k -c:v libx264 -tune zerolatency
> > -maxrate 228k -bufsize 230k -nal-hrd cbr -f mpegts
> > udp://127.0.0.1:1234?pkt_size=188 <http://127.0.0.1:1234?pkt_size=188>*
> > 
> > this generates a test pattern very close to 275 kbps
> > 
> > as i'm very close to the DVB-S net bitrate i get a near constant output
> > power (with some small gaps) and SDRAngel is quite happy
> > 
> > i will play with the -muxrate option to see if this keeps tightly the
> > bitrate at maximum limit
> > 
> > best regards
> > Bob
> > 
> > 
> > 
> > Le ven. 8 f?vr. 2019 ? 13:22, Raydel Abreu (CM2ESP) <address@hidden> a
> > ?crit :
> > 
> > > Hi Ron
> > >
> > > That formula it's very useful! Thanks. I have a silly question (sorry for
> > > it). If I understand correctly 8000000 is the symbol rate and 12901961 is
> > > the TS rate? Correct?
> > >
> > > The multiply by 2 is because Tx signal is QPSK? If that's so then it will
> > > be 1 for BPSK, 3 for 8PSK and so on.... Am I right?
> > >
> > > Thanks!
> > >
> > > Raydel
> > >
> > >
> > >
> > >
> > > El jue., 7 de feb. de 2019 7:26 PM, Ron Economos <address@hidden>
> > > escribi?:
> > >
> > >> First, you have to match the TS rate to the symbol rate. The equation is:
> > >>
> > >> Symbol rate * 2 * 188/204 * code rate
> > >>
> > >> For the example flow graph:
> > >>
> > >> 8000000 * 2 * 188/204 * 7/8 = 12.901961 Mbps
> > >>
> > >> Second, you need to constrain the video bitrate to fit into the selected
> > >> TS bitrate. With ffmpeg, something like this:
> > >>
> > >> ffmpeg -i test.mp4 -c:v libx264 -b:v 10M -minrate 11M -maxrate 11M
> > >> -bufsize 8M -c:a copy -muxrate  12901961 test.ts
> > >>
> > >> For SD video, a smaller bufsize like 2M should be used.
> > >>
> > >> Ron
> > >> On 2/7/19 15:15, Alban Meffre wrote:
> > >>
> > >> Hi All
> > >> did some transmission test in DVB-S tonight
> > >> TX : ffmpeg + gnuradio + pluto SDR
> > >> RX : RTLSDR + sdrangel
> > >> it works but there are some gaps in the received signal because the TS
> > >> stream bitrate is slightly less to the maximum usable bitrate
> > >>
> > >> is it possible to add some bit stuffing at DVB-S modulator side to make
> > >> to output power constant ?
> > >>
> > >> Bob
> > >>
> > >> --
> > >> Alban MEFFRE F4GSW
> > >>
> > >>
> > >>
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