nrussell88
commented
8 months ago I have found it easiest to narrow down where the issue is (network or machine) by adding a "file" output to your outputs and seeing if the audio experience is the same or different. I would use a file output on both devices.
You will need to create a directory for these files to go into and then note the file path. Then you can do something like the below--
outputs: ( { type = "icecast"; server = "audio-in.liveatc.net"; port = 8010; mountpoint = "essp2_twr_app_ctrl"; send_scan_freq_tags = true; name = "ESSP Twr/Radar/Control"; description = "ESSP Norrkoping, Sweden"; genre = "ATC"; username = ""; password = ""; } { type = "file"; directory = "/your/path"; filename_template = "TOWER"; }
Syntax and explanations can be found here- https://github.com/charlie-foxtrot/RTLSDR-Airband/wiki/Configuring-file-outputs#syntax
If you decide to keep the file outputs after you are done troubleshooting, you can set up a quick bash script to clean the folder every X minutes or days to prevent your storage from filling up. Some brainstorming on this here
ludwigloh
I use RTLSDR-Airband 5.0.9 on a Raspberry Pi 5. I have a problem with garbled/choppy/missing/scrambled words in the audio output. Not all the time, but with a few minutes intervals. I build RTLSDR with the "native" flag using a fresh install of Raspian (Debian 12 bookworm).
To prevent the CPU governor to decrease CPU freq, in the boot config I have set arm min freq to 2400 and verified that it it is stable on 2400mhz. htop command to watch CPU core load gives me almost never more than 10% on any core, at any time.
Here is an example audio file, a compilation of several audio faults extracted from a 30 minute window. https://file.lohelectronics.se/repository/esslproblems.mp3
If of any interest, in the stats file, I can see this
_output_overrun_count{device="0"} 21263 output_overruncount{device="1"} 20599
after a few days of running.
Here is my config file
multiple_demod_threads = true; multiple_output_threads = true; stats_filepath = "/var/tmp/rtl_airband_stats.txt"; fft_size = 256; devices: ({ type = "soapysdr"; device_string = "driver=airspyhf,serial=c852978035b425f6"; sample_rate = 0.384; mode = "scan"; channels: ( { freqs = ( 118.280,118.405,118.805,120.500,129.800,133.100,132.955,133.260,133.705,135.850 ); labels = ( "Sweden 118.280", "Sweden 118.405", "SAAB TWR", "Guard", "129.800", "133.100", "Ostgota 132.955", "Sweden 133.260", "Sweden 133.705", "Ostgota 135.850"); afc = 1; squelch_snr_threshold = (20, 15, 15, 25, 15, 15, -1, -1, -1, 15); outputs: ( { type = "icecast"; server = "audio-in.liveatc.net"; port = 8010; mountpoint = "essl"; send_scan_freq_tags = true; name = "ESSL Twr/Radar/Control"; description = "ESSL Linkoping, Sweden"; genre = "ATC"; username = ""; password = ""; } ); } ); }, { type = "soapysdr"; device_string = "driver=airspyhf,serial=36524c8035b42590"; sample_rate = 0.384; mode = "scan"; channels: ( { freqs = ( 118.280,118.405,120.355,120.500,129.800,133.100,132.955,133.260,133.705,135.850 ); afc = 1; squelch_snr_threshold = (20, 15, -1, 25, 15, 15, -1, -1, -1, 15); outputs: ( { type = "icecast"; server = "audio-in.liveatc.net"; port = 8010; mountpoint = "essp2_twr_app_ctrl"; send_scan_freq_tags = true; name = "ESSP Twr/Radar/Control"; description = "ESSP Norrkoping, Sweden"; genre = "ATC"; username = ""; password = ""; } ); } ); }