1 Aug
2007
1 Aug
'07
3:46 p.m.
I got 32-bit true lossless j2kaudio transcoding working today. I compared it against
wavpack and
wavpack seems far superior in terms of speed and compression for 32-bit floating point
data. I
created the test files with audacity, which only uses float values from +1 to -1, so I am
not sure
if it actually uses the full 32-bits, but it is still good enough for a meaningful test.
Here are the compressed size % for the worst case that I tested:
32bWN.wav 44.1kHz/32b/10ch
60sec 10 channels of white noise
105840152B
j2kaudio 91.06
wavpack 82.32
tar czf (gzip) 92.29
tar cjf (bz2) 93.24
The full test tables are here:
http://geocities.com/hildstrom/projects/j2kaudio/
Are there any wav/audio programs out there that use the full float range of 3.4e+/-38? It
seems to
me that this larger range would use more of the 32 bits.
Thanks. -Greg
--- Marc-Olivier Barre <mobarre(a)gmail.com> wrote:
Paul Winkler wrote:
Seems that ardor uses WAVE_FORMAT_IEEE_FLOAT and flac can only do pcm.
http://flac.sourceforge.net/faq.html#general__samples
That make flac not idea for that purpose. If one still wants to do that,
gstreamer could do the converion and en/decoding.
Well if FLAC can be read by ardour directly, gstreamer is not such a
bother... I can include that in my script.
Paul Winkler wrote:
On Tue, Jul 31, 2007 at 10:25:34PM +0200,
Marc-Olivier Barre wrote:
I only meant natively reading them.
On 8/1/07, Stefan Kost <ensonic(a)hora-obscura.de> wrote:
I been thinking of the same thing... can't
ardour handle FLAC files
natively ?
Nope. a simple script in <you-name-it> language
calling flac to
to compress the audio and change the session file to match the new
names should work I think.
Thoughts anyone ?
That'd be nice but as I said earlier, FLAC can't handle Ardour's wav
files:
pw@kermit sounds $ flac Audio\ 1-1.wav
flac 1.1.2, Copyright (C) 2000,2001,2002,2003,2004,2005 Josh Coalson
flac comes with ABSOLUTELY NO WARRANTY. This is free software, and
you are
welcome to redistribute it under certain conditions. Type `flac' for
details.
options: -P 4096 -b 4608 -m -l 8 -q 0 -r 3,3
Audio 1-1.wav: ERROR: unsupported compression type 3 > But as pointed out earlier in the thread,
wavpack is open source and
> it seems to work.
I'll give a try to wavpack too and tell you how things went.
_________________
Marc-Olivier Barre.
_______________________________________________
Linux-audio-dev mailing list
Linux-audio-dev(a)lists.linuxaudio.org
http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-dev