Quenten, Have you looked at any of the gr-dtv examples? Instead of pulling into GRC with UDP, you could pull the video stream and convert to mpeg-TS with either gstreamer or ffmpeg and stream it to a fifo file. The gr-dtv examples are great for reading in TS files and broadcasting. I've done this with gstreamer and gr-isdbt.
On Fri, Apr 24, 2020 at 8:57 AM Marcus Müller <[email protected]> wrote: > Hi Quenten, > > do you mean a bandwidth of 1.25 MHz, up to at most 20 MHz? Or do you > mean carrier frequency? Or do you mean occupied spectrum spans from 1.25 > MHz to 20 MHz (i.e. 18.75 MHz bandwidth)? In the latter two cases: I'd > be interested in how you build a very wideband antenna for these > extraordinarily low frequencies; that is very hard! > > I don't see how that precludes OFDM; quite on the contrary, all three > options actually sounds like a very classical use cases of OFDM. > > Best regards, > > Marcus > > On 4/24/20 1:59 PM, Quenten . wrote: > > Thanks for the tip. > > I did 1 and 2 (but didn't find a gr-digital map in the examples on > > GRC software), and what do you mean with: "it's misconfigured". > > Also you say that OFDM would be interesting(It normally would) but > > because of some circumstances I can't use OFDM. It is because its > > frequency spectrum is to low (1.25MHz to 20MHz). But the frequency > > spectrum that I am later gonna use is from 300 MHz to 3.8GHz (because > > I am gonna use a bladeRFx115 eventually as the HW component). > > > > Best regards, > > > > Quenten > > > > Op vr 24 apr. 2020 om 12:32 schreef Marcus Müller > > <[email protected] <mailto:[email protected]>>: > > > > Hi Quenten, > > > > you're using multiple deprecated blocks; especially the packet > > encooder/decoder are simply buggy and drop data. (Also, it's > > misconfigured, but properly configuring it won't help. Don't use it.) > > > > Also, while your computer might be too slow, the Throttle guarantees > > that the UDP source has to drop UDP packets if your data rate is > > higher > > than 500 kB/s... > > > > So, > > > > 1. Replace deprecated WX GUI with Qt GUI > > > > 2. Remove all throttles > > > > 3. replace packet encoder/decoder with appropriate packet > > transmission > > example from gr-digital > > > > > > You'll notice that a video stream is a lot of data, and that 500 kHz > > bandwidth simply won't do with GMSK to transport that amount of data. > > Which means you'll need more bandwidth. Which means you'll see a > > frequency-selective channel. Which means you need some > > equalization, or > > a multicarrier scheme! The OFDM-examples in gr-digital will be of > > most > > interest to you. > > > > Best regards, > > > > Marcus > > > > On 4/24/20 10:05 AM, Quenten . wrote: > > > Hello, > > > I am trying to stream (de)mod a live video with to use of GNU > > radio. > > > from my windows 10 PC. These are the steps I follow: > > > 1)Steam using OBS to an RTMP server > > > 2)Use ffmpeg to get this stream form OBS and send it to UDP > > (port:9999 > > > ; IP:127.0.0.1). > > > 3) Do GMSK mod en demod > > > 4) Save it to a file sink > > > > > > Here is the program: > > > image.png > > > I also get a warning from GNU: *WARN: Too much data; dropping > > packet. > > > *But I think this is because my PC is to slow. > > > > > > If someone can help it would be appreciated. > > > > > > Best regards, > > > > > > Q > > > >
