You can do this using Luaradio. From the example here : https://github.com/vsergeev/luaradio/blob/master/examples/rtlsdr_rds.lua and here : Https://luaradio.io/examples/rtlsdr-rds.html Replace the line Local source = radio.RtlSdrSource(frequency + tune_offset, 1102500) by by an (IQFileSource)[https://luaradio.io/docs/reference-manual.html#iqfilesource] : Local source = radio.IQFileSource('/tmp/myfile.cf32,... Source: over 2 years ago

Instead maybe have a look to this jewel : https://luaradio.io/ Easy to install (a couple of dependencies and a simple copy from git). Using scripting instead of GUI, and based and blocks. Latest version includes built-in applications for demodulation and decoding. Well documented with valuable examples, easy to understand. Linux only, all platforms. I'm a big fan. Source: over 2 years ago

Nothing beats baudline, this has been my go-to signal analyzer tool for decades. It makes me sad that the project has not seen any updates for a long time, and it is getting harder to get it to run proper on a modern OS. I believe the author considered releasing the source code under some permissive license long ago, but decided not to because the project was refused by freshmeat. Sigblip: if you read this, please... - Source: Hacker News / 6 months ago

For those who were also curious windytan explains in her FAQ that she uses _baudline_ to create these beautiful spectrograms. http://baudline.com/. - Source: Hacker News / about 2 years ago