Sox stopped working I'm using sox in this setup: `sudo timeout 20 rtl_fm -f 115.5M -s 60k -g 45 -p 55 -E wav -E deemp -F 9 - | sox -t wav - test.wav rate 11025`, it worked for quite a while but since last week it stopped working and prints this error message: sox FAIL formats: can't open input `-': WAVE: RIFF header not found The error message is not really useful though because I specifies the header already with `-t wav`...What do I need to change to get it to work?

You don't "specify the header" with `-t wav`, you tell sox that it should expect a file in WAV format on `stdin`. So `sox` dutifully starts to parse `stdin`, and expects a `RIFF` header as part of the WAV format, but doesn't get it.

So it's not "sox stopped working", it's `rtl_fm` which is for some reason not producing a valid WAV format. Checking the man page, at least for the version of `rtl_fm` on the man page, the file type is given by `-t wav`, and not by `-E wav`. So check the options to `rtl_fm`.

Did you introduce a typo last week in the command line?