similar to: Question about Huffman Tables in Setup Header

I try to merge VP3's mmx decoder into theora. http://kyoto.cool.ne.jp/vp3/developers/theora-alpha3-MMXd-src.zip You can see the change by searching the keyword "_UsingMMX_" in all lib folder's file. From VP3???YO vp3@go8.enjoy.ne.jp

Hello, in case somebody wants to test Theora without compilation, feel free to use konvalo.org's setup. It includes mplayer with theora from svn 2004-09-21 with Wim Taymans' mmx-patches from August 2004 applied (there are mplayer and mplayer.theora-mmx, the latter with decoder mmx-patches from VP3HoSwiYO) and a theora-encoder script (a bit slower than ffmpeg2theora as it runs several

Hello, in case somebody wants to test Theora without compilation, feel free to use konvalo.org's setup. It includes mplayer with theora from svn 2004-09-21 with Wim Taymans' mmx-patches from August 2004 applied (there are mplayer and mplayer.theora-mmx, the latter with decoder mmx-patches from VP3HoSwiYO) and a theora-encoder script (a bit slower than ffmpeg2theora as it runs several

Good day! I'm creating HDL IP CORE (for using in FPGA) for theora encoder (now only I-frames). I don't undestand one moment. Now i develop such stages: 1. From RBG(byer) to YCbCr converter 2. DCT processing (8x8 pixels blocks) 3. Quantizator of DCT coeff. 4. Zig-Zag of quantized DCT coeff. and now i have uresolved last stage of compression - how i must send 8x8 blocks to huffman

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

I want to analyse compressed data between VQ and Huffman coding steps. Where in source code can I access to data massive for this goal. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/vorbis/attachments/20090916/4529e42d/attachment-0001.htm

Today I've got first video clips made by the camera and compressed "on the fly" - 1280x1024x30fps. Image quality is far from perfect - I don't have yet any way to preview images, and a single acquisition still requires a bunch of commands. So I'm really close to have a camera that will be able to serve the Ogg/Theora streams, now but will it be possible to play it on a PC? I

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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

Hi everyone, I just landed into the theora planet, as a game programmer, I searched for a free video fomat/codec and the theora choice became obvious. However I experienced rather bad performance (at least from a game programming point of view) After a couple a profiling, I discovered, as previous discused in a post found via Google, that the bottleneck is in the ogg library. An unsane part of the

Dear all, I have been going through below mentioned update. http://web.mit.edu/xiphmont/Public/theora/demo.html I found this line- Timothy Terriberry estimates a simple self-training range-coding backend could be reasonably expected to decrease bit usage overhead by 15-20%. Is it really true? I found one implementation.... http://svn.xiph.org/trunk/ghost/libentcode/ Did anyone verified this

Hello, I'd like to know in detail how does the creation of VQ and Huffman codebooks work in Vorbis. I've used the source code from *encoder_example* as guide, but the only reference I've found is the function *_make_words *inside * vorbis_book_init_encode*, which creates the Huffman tree if I'm not wrong. So I have two doubts. The first is that, for creating the Huffman tree (and

Hello, I was wondering if it is possible to change the huffman stuff? A different mapping maybe, or maybe it is not too late to change? Decoding is much more efficient if: -- the huffman tree is left-aligned (i.e., longer codes more to the left) -- and we get the bits msb, not lsb Oh, and I need some clarification about the lsp: the purpose of the lsp is to find a low-bitcount approximation of

-------------- next part -------------- An embedded message was scrubbed... From: "Timothy B. Terriberry" <tterribe@vt.edu> Subject: Re: [Theora-dev] Question about Huffman Tables in Setup Header Date: Fri, 17 Sep 2004 03:43:43 -0400 Size: 3441 Url: http://lists.xiph.org/pipermail/theora-dev/attachments/20040917/99108ff9/Theora-devQuestionaboutHuffmanTablesinSetupHeader.mht

Hi, all I am studying the ogg-vorbis algorithm but I have less knowledge about the codebook structure of vorbis. After tracing the release source code, I found it doesn't use huffman tree to decode the huffman code instead of using a special mapping and pre-look. The memory requirement seems similar with huffman tree decoding. Could anyone tell me how the vorbis huffman decoding works

> On Mon, Dec 15, 2014 at 9:57 AM, Chad Rosier <mcrosier at codeaurora.org> > wrote: >> All, >> About two months ago I posted a patch that hoisted the hottest case >> statement from a switch statement during ISelLowering. >> >> See: http://reviews.llvm.org/D5786 >> >> Sean was rather adamant about using a Huffman tree (and I agree this is

> On Mon, Dec 15, 2014 at 2:26 PM, Chad Rosier <mcrosier at codeaurora.org> > wrote: >> >> > On Mon, Dec 15, 2014 at 9:57 AM, Chad Rosier <mcrosier at codeaurora.org> >> > wrote: >> >> All, >> >> About two months ago I posted a patch that hoisted the hottest case >> >> statement from a switch statement during

After messing around with this a bit recently, I've come to the following conclusions: 1. One issue is at what granularity to consider the PGO weightings. For example, should a set of 50 consecutive cases with 65% of the total weight distributed approximately evenly and which can be lowered to a table lookup be handled before the 3 remaining cases that 5%, 10%, and 20% probability,

Hi, I've been looking at the Machine Scheduler on Power PC. I am looking only at the pre-RA machine scheduler and I am running it in the default bi-directional mode (so, both top down and bottom up queues are considered). I've come across an example where the scheduler picks a poor ordering for the instructions which results in very high register pressure which results in spills.

> On Oct 13, 2017, at 1:46 PM, Matthias Braun <matze at braunis.de> wrote: > > Yes, I've run into the problem myself that the Pending queue isn't even checked with the tryCandidate() logic and so takes priority over all other scheduling decisions. > > I personally would be open to changes in this area. To start the brainstorming I could imagine that we move nodes