28 Aug
2005
28 Aug
'05
10:09 p.m.
Hi Guillaume
I'm a in the process of making a police/EMS/fire
radio recorder. ...
However, I started thinking and found that it would be better to have a
different file for each segment. For example, if there is
- 45 seconds of speech, followed by
- 3 minutes of silence, followed by
- 2 minutes of speech
I would get two files, one 45 seconds long and one 2 minutes long.
Does such a program allready exists, and if not, what would be the
best/easiest way of doing it?
Although it uses the OSS API, you might like to take a look at
batchrec-1.2.0, available in source-form only on my website at
http://www.physics.adelaide.edu.au/~jwoithe
There's no autoconf support, but it shouldn't be difficult to get going on
any modern Linux distro, and is reasonably well documented via the "-h"
command line parameter. It's tested and developed under Slackware.
From the sound of your description, batchrec will
probably do what you want.
The code is a little "quick and dirty" and
probably needs tidying up, but it
does the job. It's textmode only at this point mainly because I can't be
bothered writing a GUI for it at the moment. You also get levelmeters to
monitor the level coming in. It's OSS-only because for me it works, does
what I need and I've been short of time in recent months. I have been
toying with the idea of writing a native ALSA and/or jack backend to it, but
that is probably a way off yet.
Anyway, have a look and see if it does what you need. Perhaps contact me
off-list if you have specific followup questions.
Regards
jonathan
30 Aug
30 Aug
1:32 p.m.
New subject: [linux-audio-dev] Radio Scanner Recorder
Guillaume Filion a écrit :
>I'm a in the process of making a
police/EMS/fire radio recorder. ...
>However, I started thinking and found that it would be better to have a
>different file for each segment. For example, if there is
>- 45 seconds of speech, followed by
>- 3 minutes of silence, followed by
>- 2 minutes of speech
>I would get two files, one 45 seconds long and one 2 minutes long.
>
>Does such a program allready exists, and if not, what would be the
>best/easiest way of doing it?
Hi and thanks for your responses,
I started playing with batchrec last night with good results. The source
code is clean and compiled on the first try (on debian).
I tried it on an old 200 MHz PC with 32 MB ram. I made a small perl
script that runs every 5 minutes from a cron job. The script runs at low
priority (with nice) and does some post processing on the wav files and
recompresses them to 16 KHz 24 Kbps Mono MP3 files.
From time to time, I get a "Input/Output Error" from batchrec, I guess
this is because of the low system ressources. It might be a good idea to
do the post processing on another PC.
I'm not really familiar with jack, I took a look at the documentation
but I would have to invest more time to get something out of it. For
now, batchrec does the job pretty well. One thing that I would like to
do would be to use a low pass filter because my scanner seems to emit
some low frequency sounds that are louder than some parts of the
conversations. If I understand jack correctly, it would allow me to plug
a low pass filter in front of the recording program easily.
Anyway, I've made a big step in this project with batchrec, thanks a
lot! I'll keep you updated.
Regards,
GFK's
--
Guillaume Filion, ing. jr
Logidac Tech., Beaumont, Québec, Canada - http://logidac.com/
PGP Key and more: http://guillaume.filion.org/
3:17 p.m.
New subject: [linux-audio-dev] Radio Scanner Recorder
On Tue, Aug 30, 2005 at 11:31:50AM -0400, Guillaume Filion wrote:
Guillaume Filion a écrit :
You mean a high pass filter, right?
--
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>I'm a in the process of making a
police/EMS/fire radio recorder. ...
>However, I started thinking and found that it would be better to have a
>different file for each segment. For example, if there is
>- 45 seconds of speech, followed by
>- 3 minutes of silence, followed by
>- 2 minutes of speech
>I would get two files, one 45 seconds long and one 2 minutes long.
>Does such a program allready exists, and if not, what would be the
>best/easiest way of doing it?
Hi and thanks for your responses,
I started playing with batchrec last night with good results. The source
code is clean and compiled on the first try (on debian).
I tried it on an old 200 MHz PC with 32 MB ram. I made a small perl
script that runs every 5 minutes from a cron job. The script runs at low
priority (with nice) and does some post processing on the wav files and
recompresses them to 16 KHz 24 Kbps Mono MP3 files.
From time to time, I get a "Input/Output Error" from batchrec, I guess
this is because of the low system ressources. It might be a good idea to
do the post processing on another PC.
I'm not really familiar with jack, I took a look at the documentation
but I would have to invest more time to get something out of it. For
now, batchrec does the job pretty well. One thing that I would like to
do would be to use a low pass filter because my scanner seems to emit
some low frequency sounds that are louder than some parts of the
conversations. If I understand jack correctly, it would allow me to plug
a low pass filter in front of the recording program easily.
6:18 p.m.
New subject: [linux-audio-dev] Radio Scanner Recorder
Eric Dantan Rzewnicki a écrit :
On Tue, Aug 30, 2005 at 11:31:50AM -0400, Guillaume
Filion wrote:
Yeah, of course... silly me...
GFK's
--
Guillaume Filion, ing. jr
Logidac Tech., Beaumont, Québec, Canada - http://logidac.com/
PGP Key and more: http://guillaume.filion.org/
One thing that I would like to
do would be to use a low pass filter because my scanner seems to emit
some low frequency sounds that are louder than some parts of the
conversations. If I understand jack correctly, it would allow me to plug
a low pass filter in front of the recording program easily.
You mean a high pass filter, right?
6807
days inactive
6809
days old
linux-audio-dev@lists.linuxaudio.org
3 comments
3 participants
participants (3)
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Eric Dantan Rzewnicki -
Guillaume Filion -
Jonathan Woithe