search for: yuv12

...I have successfully created a working capture graph using OGG / Vorbis / Theora, however, when I add a Sample Grabber Directshow filter between the FFDShow decoder and Theora Encoder, this results in the video file being mirrored vertically. I have noticed that the original CaptureGraph was using YUV12, but the SampleGrabber is configured to use RGB24. Is it likely that this is the cause of the problem? Unfortuntatly I need to stick with RGB as I have already written a significant amount of code around this. Should I not be using RGB24 as an input to the OGG Mux filter? If not, can anyone sugg...

...reason why you shouldn't be able to completely regenerate the header packets/frames from what I have outlined ? --PMM ----------------------------------------------------------- Peter Maersk-Moller ----------------------------------------------------------- Ogg/Vorbis support for MPEG4IP and YUV12, XviD, AVI and MP4 for libmpeg2. See http://www.maersk-moller.net/projects/ ----------------------------------------------------------- --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to '...

Good afternoon! Thanks for the previous answers, now there was a question of efficiency. I use the formula of transformation YUV12->RGB: float r = nY + 1.371f * ( nV - 128 ); float g = nY - 0.698f * ( nV - 128 ) - 0.336f * ( nU - 128 ); float b = nY + 1.732f * ( nU - 128 ); frame[index + 0] = ClampFloatToByte( r ); frame[index + 1] = ClampFloatToByte( g ); frame[index + 2] =...

...er -ao pcm -aofile stream.wav -vo null /dev/dvd & mplayer -vo yuv4mpeg -ao null -nosound /dev/dvd & encoder_example -v1 -a 1 stream.wav stream.yuv > lec1.ogg but I get the following error: File stream.wav is 16 bit 2 channel 48000 Hz RIFF WAV audio. File stream.yuv is 720x480 29.97 fps YUV12 video. Compressing.... -Loss of framing in YUV input data Encoding works if I give mplayer an MPEG-1 file on disk as input. Anybody know what I can do to get around this? I was thinking I could try copying the VOB files to disk and then encoding each one but then I would have two ogg files th...

...he latest release and compile it yourself (I don't think it's in the binary packages). I wasn't able to get it to work at the original resolution (560 x 320), but it works fine on this scaled-down version (352x208). Note however that the input file must be capable of rendering itself in YUV12 format to begin with; for instance, raw RGB files do not work. The test suite can be found at: ftp.vp3.com <ftp://ftp.vp3.com> username: vp3 password: vp3dev in folder ./theora, download test.zip into your examples directory, or somewhere else if you've put the example binaries in yo...

...f i set it to 0 ? Will it do some default action ? Also the aspect ratio fields... i am just setting aspect_numerator = videoWidth aspect_denominator = videoHeight Am i correct in doing this ? Any restrictions ? Also... i'm noticing that most of the filters in directshow output YUY2 and not YUV12... just curious if there is code floating around somewhere to do the conversion before i write it myself... it doesn't look too complex anyway. Also, looking at some wmv output... (which is a format that outputs YV12)... it doesn't set a frame rate in the setup header... so i assume this m...

....microsoft.com/library/default.asp?url=/library/en-us/dnwmt/html/YUVFormats.asp http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directx9_c/directx/htm/yuvvideosubtypes.asp Heres the list i haev to work from... could someone tell me which 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...........

Hi I read in http://grahammitchell.net/writings/vorbis_intro.html > Ogg Vorbis files support "bitrate peeling", which means you can produce > a lower bitrate file from a higher bitrate file without re-encoding and > at the same quality as if you'd encoded the file directly into the lower > bitrate from the original file. No other lossy audio codec currently > supports

...g the code. Anyway, have anyone else experienced the problem ? And what does the Xiph people have to say about it ? --PMM ----------------------------------------------------------- Peter Maersk-Moller ----------------------------------------------------------- Ogg/Vorbis support for MPEG4IP and YUV12, XviD, AVI and MP4 for libmpeg2. See http://www.maersk-moller.net/projects/ ----------------------------------------------------------- --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to '...

Hi I was surprised with size of Theora files and thought of feedback. Following 1minute duration Theora and Xvid files were made from a y4m file. The resolution is 1280x720: 1. Xvid 17MB 2. Ogg/Theora Q7 31MB 3. Ogg/Theora Q8 38MB 4. Ogg/Theora Q9 49MB 5. Ogg/Theora Q10 61MB The Xvid file was made using mencoder by 2 passes with following options: