search for: yuv_buffer

Hello, i'm sorry for my English is not good. I need help with convert yuv_buffer data (YCbCr) to RGB without SDL. I write: BYTE *frame=new BYTE[YUV_BUFFER.y_height*YUV_BUFFER.y_width*4]; for(int cc=0; cc<YUV_BUFFER.y_height*YUV_BUFFER.y_width; cc++) { frame[cc*4+0]=YUV_BUFFER.y[cc]+1.371*(YUV_BUFFER.v[cc]-128); frame[...

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 decompr...

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 d...

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. ll-.

Hello all, When I'm doing something like: yuv_buffer yuv; theora_decode_YUVout(&td,&yuv); I'm guessing a bunch of stuff gets newed/malloced for yuv.y, yuv.u, and yuv.u. Who is responsible for deleting/freeing that stuff? Cheers, Kos.

Hi, I'd like to add user-allocated frame memory to theora via a theora_user_yuv_out callback. An additional helper function (theora_user_buffer_is_freeable) would also be required. With these two functions, user applications could submit memory buffers directly to libtheora, which would reduce the number of frame copies in a typical application from two per frame to one per frame. I've

...nd online; I think I have this part down fairly well. Eventually, what I end up with are three buffers, each one as large as the other and containing the from-RGB-to-YUV values performed per-pixel. This is where I get hung up. To pass the YUV data to the various encode functions I have to create a yuv_buffer struct and set the widths, heights, and strides correctly. What I've been trying to use is: yuv_buffer yuv; yuv.y_width = Width; yuv.y_height = Height; yuv.y_stride = Width; yuv.uv_width = Width; yuv.uv_height = Height; yuv.uv_strid...

...#39;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 record in a "yuv_buffer" structure. 2) "yuv_buffer.y_stride" is this the number of bytes in one row of Y data. In other words, y_stride*8/y_width = num bits per Y component 3) "theora_encode_header" must be called exactly once, and its output must be the first packet received by a Theora decode...

Hi, The documentation for the libtheora API is a little bit sparse - for example, information about whether yuv_buffer structs should be managed by the user or the library is missing. From talking to derf, and from what I can see in the example files, the user allocates the struct but not the luma/chroma buffers on decode; and the user allocates both the struct and the luma/chroma buffers on encode. I've made...

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 th...

I've got my encoder working now... and i put a proeprty page interface to allow the user to set a few encoding paramters to start off with... but changing the paramters doesn't seem to make barely any difference... These are the defaults i'm using... mTheoraInfo.target_bitrate=400000; mTheoraInfo.quality=30; mTheoraInfo.dropframes_p=0; mTheoraInfo.quick_p=1;

Just trying to debug my theora encoder... just wondering if someone could give me some insight on a few thigns... In the yuv_buffer i'm sending in... i am just setting y_stride = y_width = videoWidth uv_stride = videoWidth/2 y_height = videoHeight uv_height = videoHeight/2 Making the y buffer (width*height) and each of u and v (width*height/4) Am i correct in doing this ? I knwo stride needn't equal width... but from...

...ti.keyframe_auto_threshold=80; ti.keyframe_mindistance=8; ti.noise_sensitivity=1; theora_encode_init(&enc_state,&ti); theora_info_clear(&ti); } __declspec (dllexport) encode(signed char *yuvframe, ogg_page *op) { while (ogg_stream_pageout(&enc_stream, op) == 0) { yuv_buffer yuv_enc; yuv_enc.y_width=enc_width; yuv_enc.y_height=enc_height; yuv_enc.y_stride=enc_width; yuv_enc.uv_width=enc_width/2; yuv_enc.uv_height=enc_height/2; yuv_enc.uv_stride=enc_width/2; yuv_enc.y=yuvframe; yuv_enc.u=yuvframe+enc_width*enc_height; yuv_enc.v=yuv...

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 everybody ! I am working on a php class to enable, on the server-side, to extract useful data from Ogg theora videos. http://opensource.grisambre.net/ogg . I need to have it extract a thumbnail picture from a video (much like dailymotion or youtube). Right now, I am doing it using the ffmpeg-php extension (for picture extraction only), but the problem is that this module is available on

...lease seriously consider this before defining TH_REALLY_NO_ASSEMBLY to disable this message and compile without inline assembly. Thank you! So as you may expect I immediately defined TH_REALLY_NO_ASSEMBLY, and managed to get it to compile. The problem is when I try to decode a Theora frame the yuv_buffer output seems completely uninitialised, despite the decoder function returning the success flag. The application worked fine with the alpha I was using before. When I built the alpha libtheora build however I never got the above error. So I suspect that the error is right and I don't want to co...

...lease seriously consider this before defining TH_REALLY_NO_ASSEMBLY to disable this message and compile without inline assembly. Thank you! So as you may expect I immediately defined TH_REALLY_NO_ASSEMBLY, and managed to get it to compile. The problem is when I try to decode a Theora frame the yuv_buffer output seems completely uninitialised, despite the decoder function returning the success flag. The application worked fine with the alpha I was using before. When I built the alpha libtheora build however I never got the above error. So I suspect that the error is right and I don't want to co...

...oggPacket; ogg_stream_state vorbisStreamState; ogg_stream_state theoraStreamState; theora_info theoraInfo; theora_comment theoraComment; theora_state theoraState; int theoraPageCount; yuv_buffer yuvBuffer; std::ifstream videoStream; void rewind (); void initMovie (); void exitMovie (); int buffer_data (); int queue_page (ogg_page...

..._offset = 0; int video_hzn = 25; int video_hzd = 1; int video_an = 1; int video_ad = 1; int video_r = 320000; int video_q = 16; int frame_counter = 250; signed char *yuvframe; int fetch_video_page( ogg_page *videopage, ogg_stream_state *to, theora_state *td ) { yuv_buffer yuv; ogg_packet op; yuv.y_width = video_x; yuv.y_height = video_y; yuv.y_stride = video_x; yuv.uv_width = video_x / 2; yuv.uv_height = video_y / 2; yuv.uv_stride = video_x / 2; yuv.y = yuvframe; yuv.u = yuvframe + video_x * video_y; yuv.v = yuvframe +...

...#include <png.h> - typedef struct _theora_codec_tag { theora_info ti; @@ -40,9 +41,14 @@ int granule_shift; ogg_int64_t last_iframe; ogg_int64_t prev_granulepos; +#ifdef WITH_PNG + theora_state td; + video_preview_t *video_preview; + yuv_buffer yuv; + int frame_count; +#endif } theora_codec_t; - static void theora_codec_free (ogg_state_t *ogg_info, ogg_codec_t *codec) { theora_codec_t *theora = codec->specific; @@ -50,8 +56,17 @@ DEBUG0 ("freeing theora codec"); stats_event (ogg_info->mount...