Hello, I do not try to run GNUradio over my Pi4 for the moment but I encountered the problem you describe with the audio on a laptop.
I solved it by specifying the name of the audio hardware (aplay -l as far as I remember in a terminal would help) and by checking the box for the blocking process. I hope it will help you, Best regards, Fabien, F4CTZ ---- Dan Romanchik KB6NU a écrit ---- >Has anyone successfully run GNU Radio on a Pi 4? I recently purchased an >RTL-SDR dongle and thought it would be fun to experiment a little with >GNU Radio and learn something about SDR. > >A couple of days ago, I fired up GNU Radio, and after having some >trouble figuring out how to get the audio sink to talk to the Pi, I >downloaded VE6EY's FM receiver flow graph. The flow graph runs, but the >Pi 4 just doesn't seem to have enough horsepower to run it in real time. >The audio is slow and distorted. > >Thinking that it might be the WX widgets slowing down the program, I >first deleted the FFT display widgets, then converted the WX slider >controls to QT range controls. Neither had any effect on how well the >flow graph ran. > >GQRX and CubicSDDR seem to work just fine. At least with both of them, >I'm able to receive FM broadcast and NOAA weather station. But, maybe >the PI4 just doesn't have enough horsepower to run GNU Radio? If so, >that's kind of disappointing. > >73! <—ham radio lingo for “best regards" > >**Dan KB6NU** >CW Geek, Ham Radio Instructor >Author of the "No Nonsense" amateur radio license study guides >Read my ham radio blog at http://www.kb6nu.com >
