search for: yuv2rgb

hi all, i'm trying to code a tool to get some images from a ogg/theora file .... so basically i need to get a frame and convert to rgb ... and here is my question (sorry, i'm newbe here) ... how to convert a yuv_buffer to a rgb matrix ? i tryied diferent ways but my mistakes are bassically cause i don't understant how yuv_buffer structure works ... anybody can help? thanks a lot.

...clude: * Full speed playback of a 320x240x25fps clip with a 48kHz stereo audio track on an 416Mhz Xscale based wince device. (39fps if audio sync is sacrificed). * With post processing (deblocking/deringing) enabled, this drops to 23fps. * Uses no hardware acceleration features (e.g. dithered YUV2RGB is done in software, so on devices with such features available, it could go even faster). * Uses ARMv4 instructions only (no reliance on Xscale SIMD or ARMv5/v6/v7/NEON). * Compatible with films encoded with the latest encoder versions. For more information, see the website above, or contact...

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

...the whole loop. If there is no frame dropping mechanism, I would expect that the audio/video playback goes out of sync... but this is not the case. Instead the video playback slows down and the audio playback has gaps (even with precached decoded audiobuffers). Not only the Theora decoding and the YUV2RGB stuff takes time and those seem to be not the main reason why audio gets stalled (the vorbis decoder is in the same loop and it is called very frequently, also when heavy work load on theora). The problem occures when ogg_stream_pagein() is called. In case of the theora stream it has to be called a...

...n 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 liboggplay should *also* happen. yuv2rgb is tedious at best and hard to get right at worst, so being able to get frames (even theora frames) in sRGB is something I think we should provide. Many 2D graphics libraries handle alpha compositing, but only in RGB space; anyone using one of those for overlay would want this. FWIW, -r

...VEC, NEON or MSVC, since they are on the way... :P ::: i'll wait 2 days for comments and then i'll commit the changes into the repo + by then i'll have the altivec + msvc version ready. regards, viktor -------------- next part -------------- A non-text attachment was scrubbed... Name: yuv2rgb-runtime.patch Type: text/x-m4 Size: 42911 bytes Desc: not available Url : http://lists.xiph.org/pipermail/ogg-dev/attachments/20090209/dc24f19d/attachment-0001.bin

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

> 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 simple...

-----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 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

Hello, I was wondering whether or not some behaviour that I am seeing is expected behaviour and that it has been designed like this, or not. A dominator relation is given by "if A dominates B", then all paths to B go through A. For example, take the CFG below (which is a directed graph (couldn’t make the arrow heads but ok.): A / \ B C \ / D | E We can construct