Displaying 20 results from an estimated 9000 matches similar to: "How are floor and residue used in OV Codec?"
2009 Aug 22
5
How do I start using Vorbis Codec?
Hi All,
I have downloaded the Vorbis Codec source code for Windows. How do I
compile, build and run it? Do I need VisualC compiler for that? Also, please
tell me how do I test it?
Is there a easier way of accomplishing the above in Linux?
Thanks,
Niranjan
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
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
2002 Nov 26
1
floor curve question (whitening filter)
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HEAD><META http-equiv=Content-Type content="text/html; charset=iso-8859-1"></HEAD>
<BODY bgColor=#ffffff><FONT face="verdana,arial" size="2">
Hi there,</P>
one step in the encoding process (if I got it right), would becomputing a "floor
2003 Mar 14
0
encoder block diagram
I've made 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(Vorbis Illuminated seems a bit outdated,
2000 Nov 17
1
Floor codebooks vs. Residue codebooks
Hi,
Please brace yourselves for some possibly stupid questions.
Why are there only 2 codebooks for floors and many more for residue values?
What makes the encoding of floor values fundamentally different from
encoding residue values?
I have a basic understanding of VQ, and looking at the floor decode
function, it all makes sense
1) Read the codebook index from the stream
2) Do a
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
1999 Aug 15
1
Vorbis transform description
OK, into the nitty-gritty, albeit a high-level version. If it sounds
like I'm glossing important details, you're right. This discusses
only the basic DSP; precise coding, framing, sync, etc, will be in
another mail.
Vorbis is a hybrid transform domain general purpose audio encoder,
like MPEG in some respects (it is rooted in much of the same basic
theory). For the most part, the
2005 Sep 27
2
***SPAM*** encoder flow chart
Hi
Any help is appreciate!
These days I studied ogg vorbis encoder with sample rate 44.1kbsp,and I thought the whole chart was as follows:
1. read the PCM data and store them in a buffer
2. do MDCT on those PCM data
3. do FFT on those PCM data
4. use both the FFT and MDCT coefficient to the psychoacustic modle and derive an maximum allowable noise curve,
and during this curse ,do the
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 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
2009 Oct 22
1
Is it possible to seek different Ogg Vorbis encoded packets from the File?
Hi All,
I am trying to program the 'Tremor' decoder onto an array of Processors.
I am using four Processors.
I did this experiment: I split the while(!eof){} in the main() in to
four tasks using if(!eof) statements. In this modification, each if()
decodes one packet of data at-a-time, sequentially. Then, I ran the code on
a single Processor and the decoding was successful. The
2002 Sep 24
5
Floor type 0 and residues type 0 and 1
Hi,
it seems to me as if all vorbis-files only contain floors of type
1 and residues of type 2. Is it possible to "force" the encoder to
somehow create a vorbis-file with the other floor and residue types?
Tor
<p><p><p>===================================================================
EASY and FREE access to your email anywhere: http://Mailreader.com/
2001 Jun 27
1
Wavelet audio codec by Adapted Wave Tech.
Following a post on vqf.com forum, I found out that some company called
Adapted Wave Technology is ready to release its audio codec based on
wavelets. They say that this wavelet-based codec is superior to MDCT codecs
by 30-50%.
One sentence caught my attention: "Adapted Wave Technologies holds exclusive
patent rights for applying wavelet packets to audio applications." - sounds
like a
1999 Sep 06
1
Sound & Vision codec comparison article
I just found this link on slashdot:
http://www.soundandvisionmag.com/SoundAndVision/FrameSet/0,1670,_sl_SoundAndVision_sl_Article_sl_0_cm_1653_cm_130_2020_1_cm_00,00.html
It is a Sept 1999 article describing some very detailed, double blind
listening tests comparing PAC(Lucent), MP3(FhG) and MS audio at
128kbs. In typical microsoft fashon, MS audio is the clear looser
despite all their hype.
2009 May 08
3
Fw: HP Laserjet Printer Installation
Dear all,
Can any body help m on this to resolve my issue permanently. I m almost
done, but one bug is creating problem & unable to resolve it as per mail
reply from one of our colgn niranjan.ashok.
Following command is not working on my system ie $ svn co
http://svn.easysw.com/public/cups/branches/branch-1.3/. Its showing error
as " could not resolve hostname, host not found".
2001 May 26
2
merging monty's branch
Hi folks,
I'm doing a merge of my current branch onto the mainline (for testing)
today. I believe it to be stable. Just a little more vorbisfile
testing. After the merge, I have a few more patches to apply, then
onto cascading/coupling.
New stuff:
Floor backend 1 and residue backend 1; both are present, but the
mainline modes won't use either yet. Naturally, both are enabled for
2019 Jan 14
2
Reducing the number of ptrtoint/inttoptrs that are generated by LLVM
On Mon, Jan 14, 2019 at 9:36 AM Chandler Carruth via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> While I'm very interested in the end result here, I have some questions
> that don't seem well answered yet around pointer subtraction...
>
> First and foremost - how do you address correctness issues here? Because
> the subtraction `A - B` can escape/capture more
2003 Jan 09
2
AW: How do I configure 2 static net2net VPNs ov er one interface ipsec0?
Hi,
Problem:
I want 2 vpn tunnels for 2 subnets over one interface ipsec0.
Documentation only describes config for 1 vpn or road warriors.
I defined 2 vpn zones ''fre'' and ''swe''.
#ZONE DISPLAY COMMENTS
net Net Internet zone
loc Local Local
fre VPN_Fre VPN Fre
swe VPN_Swe VPN Swe
Interface ipsec0 is tunnel over eth1. Local is eth0.
ipsec0 serves 2 zones: fre
2015 Mar 28
1
Building a new decoder - some questions on the spec (residue decode)
Hi
I am trying to build a new decoder in Java, I know there are a couple
of java decoders already but they don't implement the bit of the spec
I am having questions on
Question 1)
In section 8.6.2 it mentions
"However, it is also possible to set [residue_begin] and [residue_end]
to specify
a range partially or wholly beyond the maximum vector size. Before
beginning residue
decode,
2010 Mar 04
1
Lost residue modifications
Hello,
I'm trying to modify the residue vectors in Vorbis audio files at
encoding time. For testing, I'm just adding +1 to each residue vector's
element, so e.g., if I have an original residue vector of [0,1,2,3] I
modify it during the encoding to be [1,2,3,4], and at the decoder's side
I should receive the [1,2,3,4] vector. The problem is that, after adding
the +1, I still