How can I write the audio recording in a format other than WAV?

[Sciurus Niger]

I am wondering how I can make it write the audio recording in a format other than WAV; for example MP3. The WAV files just take up too much space and I did some searching around on it but didn't find anything useful.

[Mike Bott]

On 7/13/20 3:17 PM, 'Sciurus Niger' via Gqrx SDR wrote:

I am wondering how I can make it write the audio recording in a format other than WAV; for example MP3. The WAV files just take up too much space and I did some searching around on it but didn't find anything useful.

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You could always post-process the audio with something like Sound Converter or Audacity.

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Mike

[Justin Gruwell]

I thought about using another application to convert it but was hoping there was some way I could just change to output format in GQRX. Also being able to stream over the network in a more efficient format like MP3 would save a lot of bandwidth.

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[Tate Belden]

https://trac.ffmpeg.org/wiki/Encode/MP3

On Mon, Jul 13, 2020 at 1:17 PM 'Sciurus Niger' via Gqrx SDR <gq...@googlegroups.com> wrote:

I am wondering how I can make it write the audio recording in a format other than WAV; for example MP3. The WAV files just take up too much space and I did some searching around on it but didn't find anything useful.

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Tate Belden

"The Dungeon"

We are dreamers, shapers, singers and makers. We study the mysteries of laser and circuit, crystal and scanner, holographic demons and invocations of equations. These are the tools we employ, and we know many things.  --Elric

[Alexander Fasching]

External programs like sox can convert a stream on-the-fly.
For MP3:
nc -l -u 7355 | sox -t raw -esigned-integer -b16 -r 48000 - -t mp3
output.mp3

You have to enable UDP streaming to port 7355 (default) and use this
command in a separate terminal.
nc takes the UDP stream and pipes it to sox, which converts it.
You might have to install nc or netcat.
On my system, this results in a 64kbps file and I don't know how to
select a higher bitrate.

I took this from these two links:
https://gqrx.dk/doc/streaming-audio-over-udp
https://stackoverflow.com/questions/26715383/sox-how-to-create-mp3-file-with-bit-rate-16kbps

[Greg Mc]

On Monday, July 13, 2020 at 2:17:29 PM UTC-5, Sciurus Niger wrote:

I am wondering how I can make it write the audio recording in a format other than WAV; for example MP3. The WAV files just take up too much space and I did some searching around on it but didn't find anything useful.

With ffmpeg you can capture the UDP output like this:

ffmpeg -f s16le -ar 48000 -i udp://localhost:7355 -c:a libmp3lame -b:a 96k -ar 48000 output.mp3