similar to: yuv - rgb conversion without contrast decrease.

Hello all, I'd like to convert the theora yuv_buffer to RGB that I can render onto a texture. Googling around, there are a tone of different formulae to do so. There is this (with lots of corrections and amendments further down the page): http://www.fourcc.org/fccyvrgb.php <http://www.fourcc.org/fccyvrgb.php> and there is the MSDN stuff that says you need to convert 4:2:0 and

Hey, Commenting a SoC application about improvement of Etheora, Conrad Parker said the development should focus first on the encoding features since liboggplay is overlapping with Etheora. I'm transcripting the here so the Etheora's priorities can be better discussed by everyone (and searchable on the web). _____ Conrad, you mean concentrating first on encoding part, or pehaps

Hi all, how can I convert a RGB (24 or 32) image I'm getting from a webcam for example to YUV to compress it with theora, decompress it and convert it back to RGB to draw it? Any suggestions? Best regards, Florian (Stuttgart, GERMANY)

I'm trying to learn how to use libtheora but I'm having some problems: I believe to have encoded a video, but I can't decode it. I've tried 2 things: to record a .ogg file and to write a libtheora decoder, using the encoded ogg_packets present in memory. The source code is here: http://opensvn.csie.org/ribamar/projects/streaming/cvaenc.c (it has a makefile in

Hi, is there any place where the possible values for the strides in the yuv_buffer structure is specified? or just in the source code? ;) I could compress a video with, lets say, yuvbuf.y_stride = yuvbuf.y_width, so the yuvbuf.y[0] really started in the start of the y channel data. I watched the video in several players, and everythings' ok. But, when programming the decompress process, the

hi all: i downloaded libtheora1.0.tar.gz from xiph.org, and when i compile it, such error message popped. i tried to run player_example.c under /libtheora_1.0/examples/. error message: ivysummer at ivysummer-desktop:~/??/libtheora-1.0/examples$ gcc -o player player_example.c /tmp/ccpyle3c.o: In function `buffer_data': player_example.c:(.text+0x15): undefined reference to

Hello, I want to make a program to extract frame from a theora movie as images. I tried with the decoding example located at theora web site (dump_video.c. I use it to extract a frame as yuv image but when I try to convert it to ppm with yuvtoppm program i obtain a strange image ( see http://poux.be/tmp/file.ppm ). I think it's a problem with the byte order for yuv, but don't I don't

Mike Melanson: I want to store RGB values instead of YUV. I don't understand the theoretical and practical implications of this and that's why I'm asking about it. I would like to know whether it cannot work and why. I'm targeting a minimum Pentium 4 Celeron, 256MB RAM. Video resolution are about 200 X 200 pixels with a maximum of 2 playing simultaneously as the game is playing

Hey, ::: I'm sending a patch for liboggplay for comments. It adds - runtime cpu extension detection - fixed mmx implementation - added sse2 yuv to rgb conversion - added a faster vanilla implementation ::: currently it works fine on unix systems, the MSVC implementation needs a bit of a hacking, but basically you get the concept of the refactoring. If you have any

I've spent the weekend or so trying to get my head around Theora and I'm just not having any luck. First of all, I really don't have any interest in immersing myself in video encoding--I just have one simple thing I'd like to do--so I haven't spent any time reading about the theory or specs or anything like that. I'm attempting to write a "render-to-theora"

Hello, I'm about to release a first version of etheora, a simplified api to programming theora video encoding/decoding applications with ogg containers. It uses and encapsulates libtheora + libogg API and structures, so users need to know very few , about video and data containers. An encoding process is made by these steps: /*a context declaration.*/ etheora_ctx *ec; /*encoder

Hello, I'm about to release a first version of etheora, a simplified api to programming theora video encoding/decoding applications with ogg containers. It uses and encapsulates libtheora + libogg API and structures, so users need to know very few , about video and data containers. An encoding process is made by these steps: /*a context declaration.*/ etheora_ctx *ec; /*encoder

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

Hi, I'm attempting to decode Theora videos on a PowerPC running a Linux 2.6.19 kernel. The version of GCC I'm cross-compiling from is 3.4.4. The software versions I'm running are: libogg-1.1.3 libpng-1.2.20 libtheora-1.0beta1 libvorbis-1.2.0 These are all the latest I was able to download. Here's a back trace I got while running "dump_video" under

Hello, once again I have the great pleasure to announce the release of a new Theora version - please welcome libtheora beta 2! Changes for this version: libtheora 1.0beta2 (2007 October 12) - Fix a crash bug on char-is-unsigned architectures (PowerPC) - Fix a buffer sizing issue that caused rare encoder crashes - Fix a buffer alignment issue - Build fixes for MingW32, MSVC - Improved

Hello, once again I have the great pleasure to announce the release of a new Theora version - please welcome libtheora beta 2! Changes for this version: libtheora 1.0beta2 (2007 October 12) - Fix a crash bug on char-is-unsigned architectures (PowerPC) - Fix a buffer sizing issue that caused rare encoder crashes - Fix a buffer alignment issue - Build fixes for MingW32, MSVC - Improved

I've had the same thing happen, only on the single port T1 card and a channel bank, and one of the FXO channels also having a phone attached elsewhere... I just wound up putting that channel in a different context and running Exten => s,1,Hangup (I'm just using the line for outbound dialing) -----Original Message----- From: asterisk-users-admin@lists.digium.com

hi folks! once again i am trying to decode a yuv_buffer to a 24 bit RGB buffer. last time nobody seemed willing to tell me how to do this, so i am trying again. i try to make my questions more simple. what i need to know is: how many bytes are in each y, u, v array? what for are these strides? what exactly is a "plane" in a frame, and what does it do? what i want to achieve is

On 17.01.2011 12:35, Raju wrote: > Dear friends > Recently i have downloaded Theora video codec from http://www.xiph.org/ > , > here its having both encoder and decoder , how can i build only > decoder on VC + windows platform , if i build now i will be getting " > Cannot open include file: 'ogg/ogg.h': No such file or directory " > pls send me solution for

Hi, I heard that Theora will be used on OLPC. Is anyone working on optimization for OLPC? Regards, Chih-Chung Chang