Displaying 20 results from an estimated 200 matches similar to: "Huffman decompression"
2010 Dec 10
2
Bitstream encoded huffman tables always the same
Hello all,
I've been working a little inside the Theora decoder when I found that
it seems that many videos had the very same huffman tables encoded into
their bitstreams (at least the ones that I could take my time to
dissecate). I found that the tables are listed as TH_VP31_HUFF_CODES in
the file huffenc.c. I tried to investigate a little bit more to see who
was setting the bitstream
2001 Aug 13
3
Problems with downloading R 1.3.0
I am trying to download R.1.3 for Windows , and I have troubles with some
of the .zip files. I am working with a laptop
operating on Windows 98 and use Netscape 4.5 as a browser.
I have downloaded without problems the following files:
rw1030b1.zip
rw1030ch.zip
rw1030d1.zip
rw1030d2.zip
rw1030sp.zip
rw1030w.zip
but when I try to download
rw1030b2.zip
rw1030h.zip
rw1030l.zip
the
2002 Jul 30
8
rehuff [source attached]
Hi all,
Yes, it's true. A new version of rehuff, the tool that losslessly compresses
Vorbis files: one that is easy to compile, and that works with
newer-than-two-years-ago streams, too!
On 1.0 streams, you get about 3% size reduction, and the headers get _much_
smaller (which helps for fast-start network streams).
Building it should be easy (you might have to add some -I and -L for
2002 Jul 30
8
rehuff [source attached]
Hi all,
Yes, it's true. A new version of rehuff, the tool that losslessly compresses
Vorbis files: one that is easy to compile, and that works with
newer-than-two-years-ago streams, too!
On 1.0 streams, you get about 3% size reduction, and the headers get _much_
smaller (which helps for fast-start network streams).
Building it should be easy (you might have to add some -I and -L for
2001 Jan 23
4
rehuff
Hiya,
Here is the sources to my "rehuff" program.
./rehuff in.ogg out.ogg
does a lossless recoding of a vorbis stream. (It generates optimal
huffman codes for the particular stream).
This code is meant for developers only, until someone is kind
enough to provide good build and configure support for it.
I won't. And no installation help questions please.
There is a little patch
2009 Nov 16
2
Theora Fast Quality Reduction Transcoding
Hi.
I have been working on a tool whose goal is to reduce the bit rate of theora
video by decoding to DCT coefficients, reducing the entropy of the
coefficients, and re-tokenizing the stream.
I have successfully used the decoder source to extract the DCT coefficients
for each block, and I am able to capture any and all relevant information
about where the block of coefficients falls in the
2005 Dec 09
0
RE: nodebytes and leafwords
hi kuhlen,
what you said is correct. i am talking about how
you are going to arrange these codewords into an
array, i.e. in the function _make_decode_table.
there he uses node bytes and leaf words for memory
management. i got a 24 bit platform. so if i assume
that max. codeword length that could be possible as
24 bits can i allocate a memory of (2 * used entries - 2),
to arrange the whole tree in
2003 Apr 08
6
bitpeeler
No offense, Segher, but the output quality of this thing is awful. =)
I'll disregard the fact that, at least with *my* compiler, the source
tarball I downloaded reduces every packet to zero bytes, which isn't
terribly interesting.
I decided to set the byte reduction to something constant: I started
by dividing each packet's size by 2 just to see what would happen.
The resulting ogg
2007 Aug 29
1
Fast quality reduction transcoding
Hi,
After a quick read of the Theora spec, I became curious about the
possibility of fast quality reduction of Theora videos. The idea is to
decode through the Huffman and reverse prediction steps, and then to
truncate the coefficients and reencode. My questions are:
* Is this a reasonable way to reduce the quality and bitrate of a
stream? Will it be comparable in quality to a complete
2003 Oct 10
2
New entropy coder
Hello, I am a computer engineering student and compression hobbyst
and have recently developed a new entropy coding algorithm. It can be
used to achieve compression proper of arithmetic coders at very high
speeds -almost like Huffman codecs-.
Since it could be of interest to you, I send it as an attachment -code
and technical report-. Please, drop me a line in case you have any doubt or
2002 Oct 21
3
How to fit Oggs in a specific amount of space?
I took 5 albums (Classical music) and converted them to Ogg Vorbis
at "Full Bitrate" (-q10) and all 5 directories take up about 775 Megs
which won't fit on a CD. So I ripped them again in WAV first (And
give my friend back his CDs) but now I wanna know what quality
setting should I use to fit them on 1 CD (The highest possible with
total space used just under 700 Megs)
2003 Jan 17
2
Ogg Vorbis files can be compressed ?!?
Hi there.
I have a short .ogg with Vorbis stream @56kbps
from a 44.1 16bits stereo sample, which weights
exactly 135'781 bytes. Packed to ZIP, it goes
down to 109'485 bytes, that's a 80% ratio !
Even worse with latest RAR3 archive, with
which the file size goes to 104'349 (76%).
<sceptical>
I admit this sample is a bit repetitive, but I
guess the probability of having the
2005 Dec 21
0
Samba partialy responding on 1 ethernetcard
Since a couple of days I have a very strang thing...
Machine-A : eth0 192.168.5.37
(linux) eth1 x.x.5.37
Machine-B : eth0 192.168.5.10
(win2k) eth1 x.x.5.10
eth3 not configured
Machine-C : eth0 192.168.89.10
(win2k)
Machine-B was mounted on Machine-A on /mnt/d (through 192.168.5.10)
Machine-C was mounted on Machine-B on /mnt/c (through 192.168.89.10)
After a power-failure on
2002 Oct 11
1
Re: Ogg Spec, etc.
Fredag, 11 oktober 2002, skrev du:
>Rubbish. Been there, done that (multiple times). Look at rehuff, for
>example; written without looking at libvorbis (nor at the spec).
And you wrote that without any knowledge about the file format?
Tor
<p><p>===================================================================
EASY and FREE access to your email anywhere:
2005 Oct 17
1
Shared Folder usage alpha3
Dear List,
this is my first mail to this list.
I'v tried to carefully review all given information towards the Shared
Folder subject I could find in the archive / mailing list / wiki. And so
far I'm also aware that Timo hasn't put it on the active tasklist for
the 1.0 release.
Citing the track
http://dovecot.org/pipermail/dovecot/2003-October/002493.html
I was wandering, wether any
2009 Aug 11
1
thank you
thanks very much for " ffmpeg2theora --two-pass -V 1234 inputfile.avi "
what is --optimizer , awould be possible to add --grain like you get in
MPEG2 video
2004 Feb 05
1
Psychoacoustic model
We've implemented a vorbis decoder based on Tremor and as part of the
documentation we're also writing about psycho acoustic models and
encoding.
We're quite up to date with the decoding process and psycho acoustics
in general but unfortunately not on the psycho acoustic encoding used
in Vorbis.
We have a few questions that would we would be very thankful to have
answer to:
Which
2007 Aug 25
1
Theora vs MPEG vs H264
Hi all,
I have to compare the theora codec with MPEG and H264.
I was googling and I found that the PSNR is a common used parameter.
How can I do this with Theora?
Thanks
--
Leonardo de Paula Rosa Piga
Undergraduate Computer Engineering Student
LSC - IC - UNICAMP
http://www.students.ic.unicamp.br/~ra033956
2003 Mar 31
5
Rhubarber (advanced peeler)
Hi all,
[For the uninitiated: a "peeler" is a program that transforms
a Vorbis stream into a smaller, (somewhat) lower quality Vorbis
stream, and does so quickly, by just throwing out some data.]
After having prototyped several peelers that aim to peel
to a certain filesize, or to a certain quality, with mixed
success, I've now taken a different route: a peeler that
aims for the
2003 Mar 31
5
Rhubarber (advanced peeler)
Hi all,
[For the uninitiated: a "peeler" is a program that transforms
a Vorbis stream into a smaller, (somewhat) lower quality Vorbis
stream, and does so quickly, by just throwing out some data.]
After having prototyped several peelers that aim to peel
to a certain filesize, or to a certain quality, with mixed
success, I've now taken a different route: a peeler that
aims for the