Re: [SoX-users] need help with save file to mp3

[Eric W. <nor...@yh...>]

Robin Ivetic-hotmail <cre...@gm...> wrote:
> this, but mp3 file after few minutes become extreme large and can't be
> played  at  all,

<snip>

> rtl_fm  -M  wbfm  -f  88.1M -d 0 -s 22050k -l 310 | sox -traw -r8k -es
> -b16 -c1 -V1 - -tmp3 - | sox -n some_file.mp3

I'm not familiar with rtl_fm at all, but It looks like your problem is
the final command in the pipeline:

	sox -n some_file.mp3

That means: read from /dev/null and output to some_file.mp3
Since sox will read from /dev/null forever, it'll keep writing
and you end up with a giant, silent MP3.

So I think the last part if your pipeline should be:

	sox -tmp3 - some_file.mp3

Hint: the output format of the preceding command should match the
input, so in both places, you use "-tmp3", and you use "-" to tell
sox to write/read from a pipe.

> rtl_fm -f 88.1M -M fm -s 170k -d 0 -A fast -r 24k -l 0 -E deemp |
> sox -traw -r24k -es -b16 -c1 -V1 - -tmp3 - | socat -u - TCP-LISTEN:8080
> 
> and on listener side
> 
>  netcat IP adress from host 8080 | play -t mp3 - | sox -n some_name.mp3

Similar problem.  I don't think you need the "| sox -n some_name.mp3"
at all, "play -t mp3 -" will play the MP3 from stdin.
If you want to save the mp3 while playing it, probably try this:

	netcat $IP $PORT | tee some_name.mp3 | play -t mp3 -

"tee" will write everything as-is from the remote side and emit
the identical output to stdout so the "play" command can also see
it.