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

[Robin Ivetic-h. <cre...@gm...>]

Hello,


Thanks  that WORKS really nice, need to change sampling rate to be the
same  for  rtl_fm  and sox, but this is not problem regarding sox. Can
you  help me ones more. Some rtl-sdr programs like to import wav files
for  "decoding",  can you help me with sox "side" if I want to save in
wav  file, considering that is uncompressed format. Presume that file
would  be  large,  but don't have problem with mono sound, or how else
can reduce output file....



> 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.

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-- 
Best regards,
 Robin                            mailto:otp...@ho...