search for: uv_width

...of these it is ? Best i can tell it's YUV12 ? So can someone confirm the following... each component is 8 bits. I have an array of y data. and it is an array [0..y_height] of arrays [0..y_width] ie... an array of horizontal lines ? And the uv data is an array [0..uv_height] of arrays [0..uv_width*2] where data goes UVUVUVUVUVUV........ (width uv_width*2 or uv_width lots of UV) UVUV..... . . . (uv_height lines) Is this correct ? Or is the actual byte width of the UV lines actually uv_width ? ie one UV component is shared over the y components. So if this is the yuv data from my file Pack...

...frame[cc*4+3]=255; //R = Y + 1.371(CR - 128) //G = Y - 0.698(CR - 128) - 0.336(CB - 128) //B = Y + 1.732(CB - 128) //A = 255 } But it seems to me that this code is incorrect, because don't use y_stride, uv_height, uv_width, uv_stride fields. File libtheora-1.0alpha4.pdf doesn't contain enough useful information concerning these fields: y_stride, uv_height, uv_width, uv_stride. Please, write an example-code for needeed YCbCr to RGB convertion or give me link where wrote about that. Thanks! ls, russian enthusias...

hi all I guess that *Theora* will convert the input color space (RGB or CMYK or any) into YUV before it process and encode. (that means theora can operate on several color space, but it get convert into YUV before process) Is that true...? I want to get a gray scale, encoded video output from the *Theora* encoder while the input video is getting from a web cam (color input and gray scale

...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_stride = Width; yuv.y = YDATA; yuv.u = UDATA; yuv.v = VDATA; There isn't a lot of documentation on how Theora "wants" the pixel data in theora.h, so I really feel like this should...

...Intangir: "the code i just posted is actually from a game engine..." Where is the code? Can't see it in the email. Regards. Mike Melanson <mike@multimedia.cx> wrote: wesley kiriinya wrote: > Instead of storing YUV in the stream I would store RGB values. The > y_width and uv_width would be the same. I am only doing this so that I > can play the files in my video game i.e. the ogg files won't be intended > for use by another application that plays ogg files because the > application would not know that the YUV is actually RGB. Can that work? Are you talking abou...

...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=yuvframe+enc_width*enc_height*5/4; theora_encode_YUVin(&enc_state,&yuv_enc); ogg_packet opacket; theora_encod...

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

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

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.

...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 + video_x * video_y * 5 / 4; /* is there a video page flushed? If not, work until there is. */ while( 1 ) { frame...

...ucYUVframe = malloc( iVideoX * iVideoY * 3 / 2 ); if( ucYUVframe == NULL ) { fprintf( stderr, "### malloc() error \n" ); return -1; } tYUVbuffer.y_width = iVideoX; tYUVbuffer.y_height = iVideoY; tYUVbuffer.y_stride = iVideoX; tYUVbuffer.uv_width = iVideoX / 2; tYUVbuffer.uv_height = iVideoY / 2; tYUVbuffer.uv_stride = iVideoX / 2; tYUVbuffer.y = ucYUVframe; tYUVbuffer.u = ucYUVframe + iVideoX * iVideoY; tYUVbuffer.v = ucYUVframe + iVideoX * iVideoY * 5 / 4; return 0; } int OGG_OpenClip( const char *szFilename )...