Recording in chunks using sox

Recording in chunks using sox

[Eyob Yirdaw via Sox-users]

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Hi all,
I want to record 24/7 transmission of FM radios using DVB-T dongles.  I want to direct the input audio from some dongle to sox, eg. something like
rtl_fm -f 88.8M -d 0 -M wbfm | sox -r 32k -t s16 - -t ogg device_0.ogg
here am using the rtl_fm terminal program.

Can sox help me save the continuous FM audio that comes from rtl_fm to be saved in some time length chunks, say 10 minute long chunks?It means that sox would write to disc every 10 minutes.

Thanks for any help!

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Re: Recording in chunks using sox

[Graff, David E]

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My first intuition on this would be to have your continuous a/d process pipe to some custom process (not sox), which simply takes a binary stream on stdin and creates a continuous series of data files on disk of equal length (e.g. 20 minutes worth of samples, or whatever seems like a good interval), using some reasonable template pattern for file names.


Then, there'd be a separate process (running continuously) that scans for new files at regular intervals, and runs sox on each new file, converting it from raw to whatever format you want as a final product.


  Dave Graff

________________________________
From: Eyob Yirdaw via Sox-users <sox-users@lists.sourceforge.net>
Sent: Friday, August 25, 2017 1:04:12 PM
To: sox-users@lists.sourceforge.net
Cc: Eyob Yirdaw
Subject: [SoX-users] Recording in chunks using sox

Hi all,

I want to record 24/7 transmission of FM radios using DVB-T dongles.  I want to direct the input audio from some dongle to sox, eg. something like

rtl_fm -f 88.8M -d 0 -M wbfm | sox -r 32k -t s16 - -t ogg device_0.ogg

here am using the rtl_fm terminal program.

Can sox help me save the continuous FM audio that comes from rtl_fm to be saved in some time length chunks, say 10 minute long chunks?
It means that sox would write to disc every 10 minutes.

Thanks for any help!

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Re: Recording in chunks using sox

[Peter P.]

* Eyob Yirdaw via Sox-users <sox-users@lists.sourceforge.net> [2017-08-25 19:08]:
> Hi all,
> I want to record 24/7 transmission of FM radios using DVB-T dongles.  I want to direct the input audio from some dongle to sox, eg. something like
> rtl_fm -f 88.8M -d 0 -M wbfm | sox -r 32k -t s16 - -t ogg device_0.ogg
> here am using the rtl_fm terminal program.
> 
> Can sox help me save the continuous FM audio that comes from rtl_fm to be saved in some time length chunks, say 10 minute long chunks?It means that sox would write to disc every 10 minutes.
Perhaps look at the examples for the commands "newfile" and "restart" in
SoX's manpage.

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Re: Recording in chunks using sox

[Jan Stary]

On Aug 25 17:04:12, sox-users@lists.sourceforge.net wrote:
> I want to record 24/7 transmission of FM radios

Why?

> using DVB-T dongles.  I want to direct the input audio
> from some dongle to sox, eg. something like
> rtl_fm -f 88.8M -d 0 -M wbfm | sox -r 32k -t s16 - -t ogg device_0.ogg
> here am using the rtl_fm terminal program.

Why do you want to convert from the original format to ogg?

> Can sox help me save the continuous FM audio that comes from rtl_fm to be saved in some time length chunks, say 10 minute long chunks?

Yes


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Re: Recording in chunks using sox

[Jan Stary]

On Aug 25 20:12:44, hans@stare.cz wrote:
> > I want to direct the input audio
> > from some dongle to sox, eg. something like
> > rtl_fm -f 88.8M -d 0 -M wbfm | sox -r 32k -t s16 - -t ogg device_0.ogg
> > here am using the rtl_fm terminal program.
> 
> Why do you want to convert from the original format to ogg?

See the attached script and its config.
This is what I call from cron as in 

00 06 * * 6   radio jazz   3600 $RADIO/`date +\%Y\%m\%d`-jazzrock.mp3

to download the radio shows I like. Note that this functionality
has nothing to do with SoX - the stream is just dumped to a file.

	Jan


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Re: Recording in chunks using sox

[Graff, David E]

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Note to self: read the man page before acting on the "initial intuition".  Thanks, Peter!


  Dave G.

________________________________
From: Peter P. <peterparker@fastmail.com>
Sent: Friday, August 25, 2017 2:11:14 PM
To: sox-users@lists.sourceforge.net
Subject: Re: [SoX-users] Recording in chunks using sox

* Eyob Yirdaw via Sox-users <sox-users@lists.sourceforge.net> [2017-08-25 19:08]:
> Hi all,
> I want to record 24/7 transmission of FM radios using DVB-T dongles.  I want to direct the input audio from some dongle to sox, eg. something like
> rtl_fm -f 88.8M -d 0 -M wbfm | sox -r 32k -t s16 - -t ogg device_0.ogg
> here am using the rtl_fm terminal program.
>
> Can sox help me save the continuous FM audio that comes from rtl_fm to be saved in some time length chunks, say 10 minute long chunks?It means that sox would write to disc every 10 minutes.
Perhaps look at the examples for the commands "newfile" and "restart" in
SoX's manpage.

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Re: Recording in chunks using sox

[Eyob Yirdaw via Sox-users]

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Well thanks so much guys! I really love the open source community. You really are so awesome to find the time to help guys in need.

@Peter: i will try ur suggestion. I still have to order the dongle by the way. I just needed to be sure the overall process of recording it in batches.
@David: I think ur idea is excellent too! I ll go with Peter's idea first.
@Jan: Well am not getting any attachment in your message.
 

    On Friday, 25 August 2017, 21:19, "Graff, David E" <graff@ldc.upenn.edu> wrote:
 

 #yiv9726572776 #yiv9726572776 -- .yiv9726572776EmailQuote {margin-left:1pt;padding-left:4pt;border-left:#800000 2px solid;}#yiv9726572776 #yiv9726572776 #yiv9726572776 --p {margin-top:0;margin-bottom:0;}#yiv9726572776 Note to self: read the man page before acting on the "initial intuition".  Thanks, Peter!
  Dave G.From: Peter P. <peterparker@fastmail.com>
Sent: Friday, August 25, 2017 2:11:14 PM
To: sox-users@lists.sourceforge.net
Subject: Re: [SoX-users] Recording in chunks using sox * Eyob Yirdaw via Sox-users <sox-users@lists.sourceforge.net> [2017-08-25 19:08]:
> Hi all,
> I want to record 24/7 transmission of FM radios using DVB-T dongles.  I want to direct the input audio from some dongle to sox, eg. something like
> rtl_fm -f 88.8M -d 0 -M wbfm | sox -r 32k -t s16 - -t ogg device_0.ogg
> here am using the rtl_fm terminal program.
> 
> Can sox help me save the continuous FM audio that comes from rtl_fm to be saved in some time length chunks, say 10 minute long chunks?It means that sox would write to disc every 10 minutes.
Perhaps look at the examples for the commands "newfile" and "restart" in
SoX's manpage.

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Re: Recording in chunks using sox

[Jeremy Nicoll - ml sox users]

On 2017-08-25 18:04, Eyob Yirdaw via Sox-users wrote:

> It means that sox would write to disc every 10 minutes.

Does it mean that?  I'd have thought that sox (or perhaps I should
say the underlying file system or OS) would write data more often
than that, but every ten minutes close the current output file and
open a new one.

-- 
Jeremy Nicoll - my opinions are my own

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Re: Recording in chunks using sox

[Jan Stary]

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On Aug 26 12:42:27, sox-users@lists.sourceforge.net wrote:
> @Jan: Well am not getting any attachment in your message.

sorry, attaching now


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#!/bin/sh

fatal() {
	echo $@ >&2
	exit 1
}

[ $# -ge 1 ] || fatal "usage: $0 station [length [outfile]]"

STATION=${1}
SECONDS=${2}
OUTFILE=${3}

CONFIG="$HOME/.radiorc"
. $CONFIG || fatal "Config file $CONFIG not found, no stations defined"
grep "^$STATION=" $CONFIG > /dev/null || fatal "Station '$STATION' not defined"
eval URL=\$$STATION

[ -z "$OUTFILE" ] && OUTFILE="$STATION-`date +%Y%m%d%H%M%S`.${URL##*.}"
[ -e "$OUTFILE" ] && fatal "$OUTFILE already exists"

if [ $# -eq 1 ] ; then
	play=`which play` || fatal "play(1) not found"
	$play $URL
else
	ftp -g -p -V -o $OUTFILE $URL >/dev/null 2>&1 &
	PID=$! && [ "$PID" ] && ps -p $PID >/dev/null 2>&1 ||
		fatal "Error downloading $URL"
	sleep $SECONDS && ps -p $PID >/dev/null 2>&1 ||
		fatal "Process $PID downloading $OUTFILE already exited"
	kill -9 $PID >/dev/null 2>&1
fi

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# Stations recognized by radio(1). This config file is
# sourced directly, so keep it in valid sh(1) syntax.

praha="http://icecast6.play.cz/cro2-128.mp3"
vltava="http://icecast5.play.cz/cro3-128.mp3"
wave="http://icecast5.play.cz/crowave-128.mp3"
ddur="http://icecast5.play.cz/croddur-128.mp3"
jazz="http://icecast1.play.cz/crojazz128.mp3"
radio1="http://icecast1.play.cz/radio1.mp3"
slow="http://icecast1.play.cz/slowradio160.mp3"

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