21 Sep
2012
21 Sep
'12
7:03 a.m.
hi all
i'm trying to find a reliable way to convert a batch of wav files to flac
and ogg
i have a py script that uses oggenc and flac for this, but since i newer
know what the exact bitrate/samplefreq of the input wav files will be i
want the conversion to be as robust as possible
currently i can convert the most common formats, but i'm having trouble
converting 32bit/96kHz stereo wav files : flac and oggenc dont like them :-(
i have tried with ffmpeg and various settings but i cant get it to work
using 'sound convertor 1.4.4' i can convert the samples, but that's a gui
app (and i want to script the conversion) + it does crash quite a bit when
i try to convert a number of these wav files in batch
any ideas ?
thanks!
grtz
Thijs
--
follow me on my Audio & Linux blog <http://audio-and-linux.blogspot.com/> !
21 Sep
21 Sep
7:10 a.m.
Hey Thijs!
currently i can convert the most common formats, but
i'm having trouble
converting 32bit/96kHz stereo wav files : flac and oggenc dont like them :-(
i have tried with ffmpeg and various settings but i cant get it to work
You can first convert your wav files to 44.1k oder 48k with sox:
$ sox your_96k_file.wav -r 48000 your_48k_file.wav
and afterwards use oggenc/flac:
$ flac your_48k_file.wav
LG
Georg
--
auphonic - automatic audio post production
http://auphonic.com
audio development, machine learning, open source and more
2:05 p.m.
On Fri, Sep 21, 2012 at 3:10 AM, Georg Holzmann <grh(a)mur.at> wrote:
Hey Thijs!
currently i can convert the most common formats, but i'm having trouble
my impression is that sndfile-resample will do a higher quality conversion.
converting 32bit/96kHz stereo wav files : flac
and oggenc dont like them
:-(
i have tried with ffmpeg and various settings but i cant get it to work
You can first convert your wav files to 44.1k oder 48k with sox:
$ sox your_96k_file.wav -r 48000 your_48k_file.wav
3:14 p.m.
On Fri, Sep 21, 2012 at 10:05:22AM -0400, Paul Davis wrote:
my impression is that sndfile-resample will do a
higher quality conversion.
As will zresample (which comes with the zita-resampler library sources).
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
8:17 p.m.
On Fri, September 21, 2012 8:14 am, Fons Adriaensen wrote:
On Fri, Sep 21, 2012 at 10:05:22AM -0400, Paul Davis
wrote:
And zita-resampler does not pull in X11 libs as sndfile-programs does.
(For those who care)
--
Len Ovens
www.OvenWerks.net
my impression is that sndfile-resample will do a
higher quality
conversion.
As will zresample (which comes with the zita-resampler library sources). 
9:06 p.m.
On Fri, Sep 21, 2012 at 4:17 PM, Len Ovens <len(a)ovenwerks.net> wrote:
And zita-resampler does not pull in X11 libs as sndfile-programs does.
(For those who care)
Fairly certain I remember sndfile-* not needing anything X11, so not sure
why it would pull in any in your case. I could be wrong, but that is my
memory.
Now if someone packaged it very strange I could see that happening, but not
form the program itself.
Seablade
10:16 p.m.
On Fri, September 21, 2012 2:06 pm, Thomas Vecchione wrote:
On Fri, Sep 21, 2012 at 4:17 PM, Len Ovens
<len(a)ovenwerks.net> wrote:
Ubuntu package which should be debian redone with ubuntu libs. There are
three packages in the sndfile- set. sndfile-programs and sndfile-tools
(either one gets both) and sndfile-tools comes with a "generate
spectrograms using libfftw and libcariro. That would be the X stuff, But
it looks like the samplerate-programs, which is sndfile-resample on it's
own, does not.
--
Len Ovens
www.OvenWerks.net
And zita-resampler does not pull in X11 libs as sndfile-programs does.
(For those who care)
Fairly certain I remember sndfile-* not needing anything X11, so not sure
why it would pull in any in your case. I could be wrong, but that is my
memory.
Now if someone packaged it very strange I could see that happening, but
not
form the program itself. 
10:15 a.m.
On 21/09/12 09:03, Thijs van severen wrote:
hi all
i'm trying to find a reliable way to convert a batch of wav files to
flac and ogg
i have a py script that uses oggenc and flac for this, but since i
newer know what the exact bitrate/samplefreq of the input wav files
will be i want the conversion to be as robust as possible
currently i can convert the most common formats, but i'm having
trouble converting 32bit/96kHz stereo wav files : flac and oggenc dont
like them :-(
i have tried with ffmpeg and various settings but i cant get it to work
According to the FLAC web site [1]:
"FLAC supports from 4 to 32 bits per sample. Currently the reference
encoder and decoders only support up to 24 bits per sample."
I'm not sure if there exists an encoder/decoder wish *does* support 32 bit.
If you can live with a bitrate of 24 bits, sox will automatically do the
conversion:
sox 96k_32b_file.wav out_file.flac
Apparently this was also discussed already in 2007 on the flac-dev
mailing list [2]
using 'sound convertor 1.4.4' i can convert the samples, but that's a
gui app (and i want to script the conversion) + it does crash quite a
bit when i try to convert a number of these wav files in batch
Notice that even soundconverter will most probably change the bitrate to
24 bit I would bet it is using the flac encoder anyway
Lorenzo.
[1] http://flac.sourceforge.net/format.html#metadata_block_streaminfo
[2] http://lists.xiph.org/pipermail/flac-dev/2007-April/002185.html
any ideas ?
thanks!
grtz
Thijs
--
follow me on my Audio & Linux blog
<http://audio-and-linux.blogspot.com/> !
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7 comments
7 participants
participants (7)
-
Fons Adriaensen -
Georg Holzmann -
Len Ovens -
Lorenzo Sutton -
Paul Davis -
Thijs van severen -
Thomas Vecchione