Displaying 20 results from an estimated 2000 matches similar to: "Ogg Vorbis questions"
2003 Jan 09
1
encoding to fixed window length vorbis file
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Hi!
I want to encode wav file into fixed window length vorbis file. I don't
know if "window" is good name for that, but i mean MDCT buffer size.
This buffer is passed to mdct_backward() as "in" and it's size is
determined by "init->n" variable which is also passed to this function.
So, when I say "window
2007 Nov 06
5
OGG decoding/multi-channel mixing
Hi All,
Currently I am investigating how interesting OGG is for me.
The most important requirements are:
- Decoding on embedded hardware, ARM7 or ARM9.
- Mixing multiple audio streams/files on embedded hardware
First of all how difficult is it to decode OGG on an ARM7/9 processor? I read that OGG decoding needs floating point support?
Secondly I would like to know how many MIPS are needed to
2000 Oct 23
4
More mdct questions
Sorry for starting another topic, this is actually a reply to Segher's post
on Sun Oct 22 on the 'mdct question' topic. I wasn't subscribed properly
and so I didn't get email confirmation and thus can't add to that thread.
So Segher, if the equation is indeed what you say it is, then replacing
mdct_backward with this version should work, but it doesn't.
Am I applying
2002 Oct 04
1
MDCT document
Hi
On http://www.xiph.org/ogg/vorbis/doc/vorbis-spec-intro.html there is a
link to a document titled 'The use of multirate filter banks for coding
of high quality digital audio' that explains window functions for iMDCT.
I would very much like to read that document, but the link is broken.
If someone would send me the document or a working link to it, I would be
very happy.
Thanks in
2010 Feb 12
2
Optimisation Help
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
</head>
<body bgcolor="#ffffff" text="#000000">
Hi,<br>
<br>
I have been looking into optimising the CELT decoder for speed to make
it acceptable for
2000 Aug 19
3
New LSP code committed
So, it turns out (and another implementation actually explicitly mentions it)
that LSP->LPC computation using the FIR algorithm is very sensitive to noise
(iterative algorithm) and really really requires doubles [we're not kidding].
This was complicating things for folks pursuing fixed point implementations,
and also was a potential source for bugs if FP optimizations got out of hand.
This
2004 Mar 10
0
Date: Wed, 10 Mar 2004 16:15:12 +0530
Hello !!
While reading I am facing lot of problems . Doing reserve enginnering
without any document is
really putting in trouble . ( that is not the case in ac3 , mp3 ) .
The problems are ---->
1. How physcoacoustic model is generated . I was reading noise masking .
I have understood that FFT of 2048 samples is used for finding tone
masking .
And MDCT of same samples is used for
2004 Sep 10
1
VHDL Implementation?
I'm currently looking to start my working on my major project for
College. I want to create an audio CD archival/ playback server. There
will be a base server and also several satellite players. I will be
building a secondary server for my car. And in the car power is at a
premium so I wanted true hardware support (unlike phatnoise which is
software based). The car will support both
2002 Oct 22
3
Spectral phase information in residue vectors
I found this sentence in the Ogg format specs:
http://www.xiph.org/ogg/vorbis/doc/vorbis-spec-res.html
"A residue vector may represent spectral lines, spectral magnitude, spectral phase or hybrids as mixed by channel coupling."
But where does the spectral phase information come from ?
AFAIK MDCT doesn't provide any phase information.
And in OGG-encoding, MDCT is taking place a few
2001 Sep 05
2
Understanding of Vorbis coder
Hi
I have gone through the document available in the net regarding the
Vorbis encoder /Decoder.
Based on that i have prepared a understanding document on the
encoder/decoder block. I would like to
know whether my understanding of the coder is OK. If there are any
other additional block /information pl. provide me
with the same.
Thanks and regards
S.Padmashri
<HR NOSHADE>
<UL>
2007 Feb 16
5
MGE Nova AVR 600 USB on FreeBSD
Hi,
I've seen a few emails in the archives about problems polling MGE UPSs
via USB under FreeBSD, but unfortunately I didn't find a solution in
them that works for me.
A few details about my setup.. The UPS is a MGE Nova AVR 600 connected
via USB to a FreeBSD 6.2 box. I have tried both the nut port (2.0.5)
and the svn trunk but have had no success yet. I am running nut as
root to
2007 Feb 16
5
MGE Nova AVR 600 USB on FreeBSD
Hi,
I've seen a few emails in the archives about problems polling MGE UPSs
via USB under FreeBSD, but unfortunately I didn't find a solution in
them that works for me.
A few details about my setup.. The UPS is a MGE Nova AVR 600 connected
via USB to a FreeBSD 6.2 box. I have tried both the nut port (2.0.5)
and the svn trunk but have had no success yet. I am running nut as
root to
2003 Mar 12
2
encoder block diagram
I've made a block diagram of the encoder because I tried to find out, how it works
http://stoffke.freeshell.65535.net/ogg/block.html
Although there are specifiation docs, that give very
detailed information about single aspects of the encoding (or decoding) ,
I'm missing documenations that give a more general overview,
about how the encoder works.
(Vorbis Illuminated seems a bit
2000 Nov 16
1
Documentation gripes
I have been a member of the mailing list for a couple months now. I have
not contributed anything because it has been difficult to gain a toehold
from which I could really understand the concepts used in Ogg Vorbis.
I would like to help out, but it is hard to get an idea of the overall
architecture with docs like http://www.xiph.org/ogg/vorbis/doc/vorbis.html ,
in which every link is dead.
2004 Jun 02
4
Transient coding: AAC vs. Vorbis
Thread-split from the vorbis-mailing list
("Vorbis determined to be as good as MPC at 128 kbps!")
<p>On Sun, 30 May 2004, Segher Boessenkool wrote:
[Steven So]
SS>> If iTunes AAC can encode castanets with much less pre-echo at
SS>> ABR 128 kbps, then hopefully there will be an imaginative
SS>> (and non-patented) way of doing this in Vorbis without the
SS>>
2005 Sep 29
2
stereo couple
Dear All:
I studied the stereo couple documents and now confused, I wonder
why it can be done like that, and what is the principle behind that.
I think i am confused perhaps because i have no background knowledge,
can you help me out?
Also, when doing the T/F transform,we used MDCT, so it means no imaginary part.
And i am much puzzled about the angle in the stereo couple,what does it mean?
2005 Sep 23
1
***SPAM*** help
vorbisHi
Sorry if it is too stupid to ask the following questions.
I am just confused by the pychoacoustics model. I think the computation in the psy.c is to
derive a curve which stands for the threshold for the mdct coefficient. Is it right ?
If it is right , then what can we do with the curve ? I refered to several articles and find the aim of
most pychoacoustics model was to derive the SMR
2001 May 23
3
optimisation
what are the main fields where optimisation will take place to improve
the CPU use when decoding Ogg Vorbis files?
--
Venlig hilsen/Kind regards
Thomas Kirk
ARKENA
thomas@arkena.com
http://www.arkena.com
"I was drunk last night, crawled home across the lawn. By accident I
put the car key in the door lock. The house started up. So I figured
what the hell, and drove it around the block a
2006 Apr 20
3
The contrary of command %in%
Dear r-list,
I've got a data base:
> HData[1:10,]
NumTree Site Species Date Age DBH H IdentTree
1 1 Queige Spruce 2002 184 49 33.5 Queige 1
2 2 Queige Fir 2002 NA 5 4.6 Queige 2
3 3 Queige Fir 2002 25 8 6.6 Queige 3
4 4 Queige Spruce 2002 198 47 32.5 Queige 4
5 5 Queige Fir 2002 200 59 35.3 Queige 5
6 6 Queige
2003 Jul 22
1
Making a group membership matrix
Hi Helpers:
I have a factor object that has 314k entries of 39 land cover types.
(This object can be coerced to characters neatly should that be easier
to work with.)
> length(foo)
[1] 314482
> foo[1:10]
[1] Montane Chaparral Barren Red Fir Red Fir
[5] Red Fir Red Fir Red Fir Red Fir
[9] Red Fir Red Fir
39 Levels: