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 $PATH or be fully specified with their path. Best regards, Marcus On Mon, 2019-02-11 at 13:05 +0000, Mir Muhammad Lodro wrote: > Thanks for your reply. I can see the gr_modtool in the said directory. > However, I can't start gnuradio using > ~/prefix/default/bin/gnuradio-companion > > When I do this it says: > > mirlodro@mirlodro:~/prefix/default/bin$ 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 <[email protected]> wrote: > > Send Discuss-gnuradio mailing list submissions to > > [email protected] > > > > To subscribe or unsubscribe via the World Wide Web, visit > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > or, via email, send a message with subject or body 'help' to > > [email protected] > > > > You can reach the person managing the list at > > [email protected] > > > > When replying, please edit your Subject line so it is more specific > > than "Re: Contents of Discuss-gnuradio digest..." > > > > > > 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 <[email protected]> > > To: "Raydel Abreu (CM2ESP)" <[email protected]> > > Cc: Ron Economos <[email protected]>, discuss-gnuradio > > <[email protected]> > > Subject: Re: [Discuss-gnuradio] bit stuffing DVB-S TX example ? > > Message-ID: > > <cad4huo1tteiefakq_0z90tpbd0x6s-me3groujzapp_fwxj...@mail.gmail.com> > > 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) <[email protected]> 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 <[email protected]> > > > 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 > > >> > > >> > > >> > > >> _______________________________________________ > > >> Discuss-gnuradio mailing > > >> [email protected]https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > >> > > >> _______________________________________________ > > >> Discuss-gnuradio mailing list > > >> [email protected] > > >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > >> > > > _______________________________________________ > > > Discuss-gnuradio mailing list > > > [email protected] > > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > > > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > [email protected] > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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