similar to: yuv2rgb

I'd previously been working on the assumption that the frame_height was the height of the inner picture region... and height was the height of the outer frame. Then upon readnig the spec... where it calls the outer part the frame and the inner part the picture region... i assumed i'd made a mistake and that frame_width is actually >= width in the theorainfo structure... ie

On Tue, Jul 20, 2010 at 2:46 PM, Talin <viridia at gmail.com> wrote: > On Tue, Jul 20, 2010 at 8:34 AM, Chris Lattner <clattner at apple.com> wrote: > >> >> On Jul 20, 2010, at 1:36 AM, Anton Korobeynikov wrote: >> >> >> used to make the code manipulating the union type "well typed". This >> >> approach seems work very well, is

Hello everyone. I need some help to understand when number precision in R is set. For this please consider the following example for (i in c(2:length(final))){ sizex <- c(sizex,(final[i]-final[i-1],digits=2))) # round is used to remove values that are too small like e-17. print(round(final[i]-final[i-1],digits=2)) } final[2]-final[1] return something like 4.440892e-16, which

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 The attached patch splits Theora decode and YUV2RGB into separate threads. These are by far the two most computationally demanding components of Cortado, so by splitting them we can substantially improve performance on multiprocessor machines. I have verified that the patch does split these into two threads, and performance does appear to improve.

Hello, I'm new to this list, and pretty much also to the codec universe. In a computer game I'm working on, there is an 3D TV-screen onto which I project the frames of a movie. The movie is of course stored as theora, no audio as it's not needed yet. I have it working so far, extracting a frame and uploading it to the graphics card when the scene is drawn. The example file

This is a note to announce the availability of "Ogg Theorarm", an optimised ARM implementation of decoding libraries for the Theora video code, and Vorbis audio codec from xiph.org. Full details of this code release can be found at <http://www.wss.co.uk/pinknoise/theorarm>, but highlights include: * Full speed playback of a 320x240x25fps clip with a 48kHz stereo audio track on

Hi there, is there any document giving a high-level overview of how to use "libtheora"? As it stands, I'm scrounging through headers and example code, and doing a whole lot of guessing. In the meantime, could you either confirm or deny the following guesses? 1) Before compressing with Theora, I must unpack my YUY2 data into three separate arrays (Y, U, and V respectively), and

Hi, I've eventually released the first version of my rendering library for Kate streams, and I've recently been hacking away at adding it to liboggplay. That was the missing "overlay" mode to the browser_plugin patch I sent a while ago. Now, I'm not too sure how to expose those overlays to liboggplay users: the obvious solution is to add a RGBA video type, and expose the

Hi, first post on this list. I run a small game development company specializing in casual Windows/Mac games. We've been using Theora for video playback inside our engine for a while, but we always run into performance issues. I've tracked them down to two parts : YUV to RGB decoding (done via software) and uploading the new pixel data to the video card as a texture. For the YUV to RGB

Hi Ralph, thanks for your posting. Yes, the standard example player in the theora distribution could also do it when theora would not need so much time. I removed the frame dropping from the example because it's based on some audio stuff under Linux that isn't available on Windows. Currently I've no frame dropping handling build in because the first goal is a good raw performance of

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

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"

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

I think libkate should be able to render in the yuv colour space. A lot of players use hardware accelerated colour space conversion and scaling, so in addition to your point about saving unneccesary conversions, they are likely to be able to offload the compositing step as well. This means that libtiger should also be able to do the compositing in yuv. I think adding an RGB/RGBA frame type to

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 think adding an RGB/RGBA frame type to liboggplay should *also* > happen. yuv2rgb is tedious at best and hard to get right at worst, so I'd added an RGBA type, but if this is going to also carry video, it might be better to merge this with the existing video type, and have a 'type' enum, or just several pointers, only one set being non NULL (makes client code simpler). Would

I posted this the other day... but it didn't get delivered... ------------------------------------------------------------------- I'm getting stuck into a theora decoder for directshow... i was just wondering if someone could give me some info. What output format does theora use ? http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwmt/html/YUVFormats.asp

Hello list, When I convert an yuv pixel into rgb using the recipies in http://www.fourcc.org/fccyvrgb.php I get an accurate color conversion but the contrast seems to be decreased. If i write, e.g., the pixel directly into an sdl yuv_overlay, I get a well-contrasted frame, however, if I convert the pixel to rgb and call SDL_MapRGB, I get a contrast-decreased frame. Thanks, Ribamar

Hello and sorry for necro posting xD this is the only thread I found about stalker. I really want this game to run. I've tried to run it under ubuntu but when I boot it ti makes xengine to crash... I've tried to follow the guide posted but i've got none of the packages from the line #yum install etc... how can I fix it? plz

Dear theora developer community, currently I'm working on a simple Theora player for Windows. But the code in the player_example.c seems not to have the performance of other implementations like the Direct Show filters by illuminate. In the example player, all important things are done in one thread: decoding the next vorbis or theora packet(s) and reading from the physical stream (+ split