12 May
2005
12 May
'05
1:09 a.m.
I recorded a one hour audio session using windows Sound Recorder for a friend
and much to my chagrin and my friend's dismay, the Audacity edited file is
over 400M!
This friend is now telling me that in the past when the same one hour
recording session was done the file size never exceeded 27M. I do not doubt
them, but I have no idea how to reduce/compress this wave file.
If someone knows how I can reduce this one hour wave formatted session to a
file size of 27M, please let me know.
Thanks
Flash
12 May
12 May
1:24 a.m.
On Wed, 11 May 2005, Flash Love wrote:
I recorded a one hour audio session using windows
Sound Recorder for a friend
and much to my chagrin and my friend's dismay, the Audacity edited file is
over 400M!
recording session was done the file size never exceeded 27M. I do not doubt
Well, exercise simple logic. Uncompressed audio as wav or CD audio
is basically of the same type, 2-channel, 16-bit, 44.1Khz sr. A 74 minute
CD has 650Mb. How could that file of yours possibly ever be below 27Mb ?
:)
Probably even as an mp3 it wouldn´t be that small. Anyway, if you
want to experiment with lossless compression, try the FLAC soundfile type.
MB
1:25 a.m.
New subject: [linux-audio-user] Is there a way to compress the size of a wave file?
Windows Sound Recorder can send the recorded data on-the-fly through a
codec for compression. Obviously if you are planning on editing the
audio, you're best recording in a non-lossy format.
If you're recording off a cheap mic, you can probably record at a much
lower bitrate/frequency using only mono. Everytime you drop any of the
previous, your filesize will drop. This should make the uncompressed
file much smaller.
later,
Steve
On Wed, 2005-05-11 at 22:09 -0500, Flash Love wrote:
I recorded a one hour audio session using windows
Sound Recorder for a friend
and much to my chagrin and my friend's dismay, the Audacity edited file is
over 400M!
This friend is now telling me that in the past when the same one hour
recording session was done the file size never exceeded 27M. I do not doubt
them, but I have no idea how to reduce/compress this wave file.
If someone knows how I can reduce this one hour wave formatted session to a
file size of 27M, please let me know.
Thanks
Flash
6:18 a.m.
New subject: [linux-audio-user] Is there a way to compress the size of a wave file?
On 12/05/05 04:09:15, Flash Love wrote:
I recorded a one hour audio session using windows
Sound Recorder for a friend
and much to my chagrin and my friend's dismay, the Audacity edited file is
over 400M!
400Mb is about right for about 40 mins of uncompressed audio (the original 1 hour session,
uncompressed would be 605Mb. If the WAV file you started with was smaller than that then
it musthave been compressed.
There are ways to compress the file; some are lossy, i.e. they throw away parts of the
sound that the designers don't think you could hear, and some are non-lossy, i.e. when
you uncompress it you get the original back exactly.
The most well known lossy format is MP3 altough OGG Vorbis is a popular choice
particularly with supporters of free software as it it patent-free. There is software
available for Linux to compress to either of these formats. With lossy formats you can
choose how much gets thrown away and therefore how much compression you get. In some
cases you choose the bitrate and in others you choose a quality factor. As an example
128Kbit MP3 achieves a typical compression of about 1:10, i.e. the compressed files are
about 1/10 the size of the original. WMA (windows media) and AAC (DVD sound tracks) are
also lossy formats.
There are a variety of non-lossy formats too but the one that seems to be popular on Linux
is FLAC. The compression you get varies slightly depending on the source but is typicaly
1:2 i.e. the compressed files are half the size of the original. This compression ratio
is fairly typical of non-lossy compression.
My personal choice is to keep things I intend to edit further or transfer to CD in WAV
(uncompressed) or FLAC format and music in it's final form that will be listened to
direct from the PC in Ogg Vorbis with -q 6.
Steve.
7 a.m.
Hi,
On Thursday 12 May 2005 10:18, Steve Fosdick wrote:
On 12/05/05 04:09:15, Flash Love wrote:
It was perhaps a decade since I last tried the windows sound recorder, but as
I recall the default was to recorded in mono and with much lower sample rate.
Though, memory fades over a decade, it can be completely false.
/Robert
--
http://spamatica.se/musicsite/
I recorded a one hour audio session using windows
Sound Recorder for a
friend and much to my chagrin and my friend's dismay, the Audacity edited
file is over 400M!
400Mb is about right for about 40 mins of uncompressed audio (the original
1 hour session, uncompressed would be 605Mb. If the WAV file you started
with was smaller than that then it musthave been compressed. 
3:29 p.m.
I have been studying WAV files from various sources, and find that it is
possible to alter the sampling rate of the recording (i.e, instead of CD-quality
at 44.1K, I've seen 22050, and even 16K). Mostly the sources I have seen in
this form have been spoken word -- radio programs, interviews, etc -- but the
results have been OK (obviously with expected loss in frequency range).
Combined with making the recording monaural, the WAV file size can be smaller.
/ken
Flash Love wrote:
I recorded a one hour audio session using windows
Sound Recorder for a friend
and much to my chagrin and my friend's dismay, the Audacity edited file is
over 400M!
This friend is now telling me that in the past when the same one hour
recording session was done the file size never exceeded 27M. I do not doubt
them, but I have no idea how to reduce/compress this wave file.
If someone knows how I can reduce this one hour wave formatted session to a
file size of 27M, please let me know.
Thanks
Flash
6:31 p.m.
Thanks for the responses.
Flash
On Thursday 12 May 2005 12:29 pm, Ken Dawson / Chia Wu wrote:
I have been studying WAV files from various sources,
and find that it is
possible to alter the sampling rate of the recording (i.e, instead of
CD-quality at 44.1K, I've seen 22050, and even 16K). Mostly the sources I
have seen in this form have been spoken word -- radio programs, interviews,
etc -- but the results have been OK (obviously with expected loss in
frequency range). Combined with making the recording monaural, the WAV file
size can be smaller.
/ken
Flash Love wrote:
> I recorded a one hour audio session using windows Sound Recorder for a
> friend and much to my chagrin and my friend's dismay, the Audacity edited
> file is over 400M!
>
> This friend is now telling me that in the past when the same one hour
> recording session was done the file size never exceeded 27M. I do not
> doubt them, but I have no idea how to reduce/compress this wave file.
>
> If someone knows how I can reduce this one hour wave formatted session to
> a file size of 27M, please let me know.
>
> Thanks
> Flash
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days inactive
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linux-audio-user@lists.linuxaudio.org
6 comments
6 participants
participants (6)
-
Flash Love -
Ken Dawson / Chia Wu -
Marcus Alessi Bittencourt -
Robert Jonsson -
Stephen Hassard -
Steve Fosdick