Howdy All,
I recently finished completely overhauling the ISO 'dist10' LSF decoder to
extract a layer-III only player for work. In the process, I discovered a
few bugs/inconsistencies in/between the 'dist10' distribution and ISO/IEC
11172-3 and 13818-3. I don't know if they would account for
Thanks for the summary, Mark.
I forgot to mention the 330/332 bug, which I had independently located and
saw discussed here earlier. I looked at the ISO code for the Huffman
quadruples, and it looks OK. There is very little scfsi related code, and
it looks OK, though I don't think I've ever
Howdy All,
-Original Message-
From: Zia Mazhar [mailto:[EMAIL PROTECTED]]
Sent: Monday, April 24, 2000 3:36 PM
To: [EMAIL PROTECTED]
Subject: Re: [MP3 ENCODER] mpglib bugfix
Naoki Shibata wrote:
...
I made a patch to fix some problems of mpglib. And, I updated
in_mpg123
AM to burn these days...
I'm sure every decoder should decode (and play music)
rather then locate incompliances in bitstream. 1 KB is not a cost.
Amen.
...
Maybe Alex Broadhead could comment on if the decoder he just
wrote could handle this?
Sorry, I was off for a few days
Howdy Mark,
-Original Message-
From: Mark Taylor [mailto:[EMAIL PROTECTED]]
Sent: Monday, May 01, 2000 10:18 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: Re: [MP3 ENCODER] MP3Enc upsampling /buffer
...
I should note, BTW, that the ISO 'dist10' package uses a
Try two - I'm guessing the first one bounced due to the excess of LOVE on
the net...
Howdy Mark,
-Original Message-
From: Mark Taylor [mailto:[EMAIL PROTECTED]]
Sent: Monday, May 01, 2000 10:18 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: Re: [MP3 ENCODER] MP3Enc
Howdy Twinkles,
What is the real difference between 8 and 16 bit audio at the same
sampling frequency?
According to the standard approximations of the statistical formulation
(which allows ~6dB/bit) - about 48 dB of SNR...
If this means nothing to you, then consider that even basic
Howdy,
I'll third (or fourth or whatever) this as well, though with a few
caveats...
I really have to second this. A pair of $2000 floor standing speakers
can't compete with the flatness of a good pair of headphones
(due to room modes if nothing else).
Well, yes and no. I rely strongly
Howdy J,
I am looking for a way to capture both audio and video,
synchronize them,
and multicast the resulting stream. The receivers must run on windows
platforms as well as Linux. The encoder must run on Linux.
Not to clutter this list up with commercial chatter or anything, but this is
Howdy All,
In testing my (comparatively naive) hack of the dist10 encoder, I have
discovered that, while it does OK for music, it has real problems with
speech signals. (Caveat: at our lowest overall bitrate of 300kbps for
combined video/audio, we run the audio at 32kbit mono - though we go
Howdy All,
Thanks for the quick replies!
Gabriel Bouvigne wrote:
If you want to encode voice signals, I'd suggest you to use --voice
or --preset voice
Actually, I want to encode general signals (mostly TV and movies), many of
which have significant voice components, and, unfortunately, many
Howdy,
I'd like to know where to find some sources or specifications
on the CRC used
on MP3 frames. I know I could get it in the lame sources, but
I'd like to know
first if it's fully compliant !
The polynomial used for CRC on all layers of MPEG audio is given on p.30 of
ISO/IEC 11172-3:
Howdy Gabriel,
First, please note that it has been a long time I didn't really looked
inside of the Lame code, so I'll perhaps tell a few wrong statements.
(btw, please could anyone explain me when to use the word "tell" and
when "say"?)
Hmmm... That's actually kind of tricky. Neither is
Howdy,
:: My purpose was to measure the computational accuracy of
audio decoders in the
:: manner described by ISO/IEC 11172-4.
::
The result is a ISO/IEC 11172-4 compliant decoder. It's not
so much better
than a ISO 9001 certificate. A decoder with a bug fails the test.
But not vice
Howdy Patrick,
Would you recommend me to use the dist10 decoder as a basis for a
further implementations ?
Pretty much everyone does, so come on in, the water's fine... (You don't
really have much choice - there are bugs in the spec which can only be fixed
(readily) by looking at the dist10
Howdy,
How to compile lame on a system where only a C++ compiler is
available (the
C compiler costs extra money)? Currently lame generates
nearly uncountable
errors with a C++ compiler.
I'm having a similar problem trying to compile LAME for my system, for which
only a BASIC compiler is
Howdy Gabriel,
Am I the only one wich doesn't understand what Frank is telling?
Can anyone explain a little?
You are not alone. Once I get past his aggressively authoritative posting
style (which is a major disincentive to understanding for me), I find I
understand about half of what Frank
Howdy Robert,
Alex, if you remember Frank's post about DC offsets, there he attached
a little C program to calculate AC/DC offsets as well as a correlation
between left and right channels. (was around 00/08/05)
I'm not sure I read those - DC offsets aren't particularly relevant to my
current
Howdy Steve,
Does anyone know a good technic/routine to time-stretch a
buffer of audio data
(mono channel) ?
Assuming that you want to keep the pitch the same, phase vocoding comes to
mind. This is an old speech processing trick (thus the vocoder) for
shifting pitch without changing speed
Howdy Mike,
Wow, great pointer. The DSP Dimension page had one of the most concise and
yet clear discussions of pitch scaling I've seen. (And it's nice to know
that I didn't need to hedge so much in my original response - my memory was
pretty much spot on...) I'm going to have to read through
Howdy All,
I just finished adding a very basic intensity stereo implementation to our
encoder, using what little the ISO spec had to say on the subject as a
guide. It doesn't really improve the sound much, but I suspect that this
has to do with the questions I encountered (and worked around)
Howdy Robert,
Thanks for the quick response.
2) In layer-II coding, the first band to code using
intensity is specified
by the mode extension - in layer-III it can by dynamically
varied and is
understood implicitly from the bitstream by the decoder.
But the spec gives
no suggestions
Howdy,
Unless they have changed it significantly since I last looked at it (quite a
while ago) AIFC is just AIFF with the added possibility of using compressed
audio instead of raw PCM.
Either format is 'chunk' based, like RIFF-WAVE. That is, an AIFF/C file
consists of a number of chunks, most
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