search for: rehuff

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 (...

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 (...

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 install...

Hi, reading old messages in the archive I found this mail: http://lists.xiph.org/pipermail/vorbis-dev/2003-October/016659.html > p.s. For those wondering, I soon will package up rehuff, and > put a user interface on it etc. It will be GPL. I just need > to find the time (and incentive) to do it. Fanmail wouldn't > hurt... (doh) This is my fanmail :) I have retried the old version of rehuff: http://lists.xiph.org/pipermail/vorbis-dev/2002-July/006253.html with t...

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

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: http://Mailreader.com/...

Hello ! A question to all 'Wheel-reinventers': I can build the huffmantrees by hand (on paper) but how to code it? Are there any good URLs out there? Or does the spec supply sufficient information? I tried figure out how oggdec (debugging) does this, but I couldn't get the clou. Thank you Dominik --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project

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

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

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

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

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)

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

...ults in a file with an optimal file size vs. sound quality tradeoff, disregarding the size of the Vorbis headers and the Ogg packing (these proved to hard to factor into the formula, while still retaining adequate processing speed; besides, this size is constant for any given stream. You might run rehuff on the stream first, to losslessly make smaller headers). Have fun, <p>Segher <segher@xiph.org> <p> -------------- next part -------------- A non-text attachment was scrubbed... Name: apr.tar.bz2 Type: application/octet-stream Size: 3401 bytes Desc: apr.tar.bz2 Url : http://li...

...ults in a file with an optimal file size vs. sound quality tradeoff, disregarding the size of the Vorbis headers and the Ogg packing (these proved to hard to factor into the formula, while still retaining adequate processing speed; besides, this size is constant for any given stream. You might run rehuff on the stream first, to losslessly make smaller headers). Have fun, <p>Segher <segher@xiph.org> <p> -------------- next part -------------- A non-text attachment was scrubbed... Name: apr.tar.bz2 Type: application/octet-stream Size: 3401 bytes Desc: apr.tar.bz2 Url : http://li...

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

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

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

I must compress some thousands of very small WAV samples. I compressed them with OGG and got a very strange result: uncompressed WAV size is 1 kb, and compressed OGG size is 3 kb. (I tried a minimal quality settings (--managed -m 16 -M 16 -b 16)) Is this a bug, or OGG file header is so huge? Is there any way to compress such a small files? Thanks. --- >8 ---- List archives:

> And as long as the spec contains errors, it makes no sense at all > as Moritz did to claim, that everyone is free to implement their > own encoder or decoder, or as Jon did to claim that the file format > is documented. Actually, people have implemented perfectly valid Vorbis encoders and decoders before the specification was even published. I wouldn't go so far as to call other