similar to: [?] About YUV formats...

On Tue, Nov 08, 2005 at 06:08:25PM +0800, illiminable wrote: > Why not just make it OggRawFOURCC, do we really need one stream format for > rgb, and one for yuv ? [snip] > I just meant oggRaw, not fourcc. Oh, thank god you corrected this. :-) I was contemplating an "OggVid" format, and here is why I'm steering against it (though, yes, this has been a topic of

On Tue, Nov 08, 2005 at 06:08:25PM +0800, illiminable wrote: > Why not just make it OggRawFOURCC, do we really need one stream format for > rgb, and one for yuv ? [snip] > I just meant oggRaw, not fourcc. Oh, thank god you corrected this. :-) I was contemplating an "OggVid" format, and here is why I'm steering against it (though, yes, this has been a topic of

> But chroma subsampling? no. And this is where much of the complexity > comes. > > If we were to combine them, we would be, essentially, doing it something > like > this: > Value Meaning > 0 RGB > 1 YUV444 > 2 YUV422 > 3 YUV420 > 4 YUV411 > ..... Yes. > And then spend an additional field on bits/channel, whereas both chroma

> But chroma subsampling? no. And this is where much of the complexity > comes. > > If we were to combine them, we would be, essentially, doing it something > like > this: > Value Meaning > 0 RGB > 1 YUV444 > 2 YUV422 > 3 YUV420 > 4 YUV411 > ..... Yes. > And then spend an additional field on bits/channel, whereas both chroma

Hello! I'm trying to use ffmpeg2theora to encode raw (.yuv) files in I420 format (just frames, no headers at all), but failed to find corresponding input format. Is there any documentation of supported formats for ffmpeg2theora? Or maybe there is another command-line tool for Windows to encode raw video using Theora algorithm? Thank you for help! Alexander.

Hello. I read documentation, but I didn't found anything about encoder supported YUV format. Is Y in [0-255] or in [16,235]? And U,V are in [16,239]? I'm trying to write a fast (with lookup) conversion from RGB -> YUV... Thanks in advance, Andrea -------------- next part -------------- An HTML attachment was scrubbed... URL:

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"

On Fri, 4 Jun 2004, Makc wrote: > Here's what you can find in the net on YUV scheme: Hmm? What prompted this? > The statement I care to make here, is simply that there ain't neither > such thing as "luminance", which details "the eye is more sensitive to", "ain't neither"? Double negative, so I take your statement to mean that there *is* such

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

Here's a shot at a list of fields: // High level data Displayed Width&Height Stored Width&Height Aspect Ratio (Fractional) Frame Rate (Fractional) FourCC (Optional, set to zero to use values below) Colorspace (enum, R'G'B', Y'CbCr, JPEG (not sure proper name), etc) // Subsampling data U Channel X Sample Rate (Fractional) U Channel Y Sample Rate (Fractional) U Channel

Updated again... theora works and seeks properly (not to keyframe) in WMP 9 and 10. You can encode from a bunch of onew input types like RGB32, RGB24, IYUV etc. And fixed a bug that was stopping the filters being used in a activeX control in an IE browser. www.illiminable.com/ogg/ Enjoy, Zen.

Updated again... theora works and seeks properly (not to keyframe) in WMP 9 and 10. You can encode from a bunch of onew input types like RGB32, RGB24, IYUV etc. And fixed a bug that was stopping the filters being used in a activeX control in an IE browser. www.illiminable.com/ogg/ Enjoy, Zen.

Updated again... theora works and seeks properly (not to keyframe) in WMP 9 and 10. You can encode from a bunch of onew input types like RGB32, RGB24, IYUV etc. And fixed a bug that was stopping the filters being used in a activeX control in an IE browser. www.illiminable.com/ogg/ Enjoy, Zen.

Updated again... theora works and seeks properly (not to keyframe) in WMP 9 and 10. You can encode from a bunch of onew input types like RGB32, RGB24, IYUV etc. And fixed a bug that was stopping the filters being used in a activeX control in an IE browser. www.illiminable.com/ogg/ Enjoy, Zen.

On 19/01/2025 16:59, Sui Jingfeng wrote: >>>> But userspace must be able to continue allocating YUV buffers through >>>> CREATE_DUMB. >>> >>> I think, allocating YUV buffers through CREATE_DUMB interface is just >>> an *abuse* and *misuse* of this API for now. >>> >>> Take the NV12 format as an example, NV12 is YUV420 planar

Hi, On 2025/1/19 20:18, Tomi Valkeinen wrote: > Hi, > > On 19/01/2025 13:29, Sui Jingfeng wrote: >> Hi, >> >> On 2025/1/16 18:35, Dmitry Baryshkov wrote: >>> On Thu, Jan 16, 2025 at 11:17:50AM +0100, Geert Uytterhoeven wrote: >>>> On Thu, Jan 16, 2025 at 11:03?AM Tomi Valkeinen >>>> <tomi.valkeinen at ideasonboard.com> wrote:

This also includes, other non raw formats... http://www.fourcc.org/codecs.php "fourcc" 's of rgb types http://www.fourcc.org/rgb.php raw yuv formats only http://www.fourcc.org/yuv.php Registered fourcc codecs http://www.microsoft.com/whdc/archive/fourcc.mspx Enumeration of actual types that are used in directshow (bottom of page)

> > FourCC is a codec identifier, nothing more. It's four letters which can > be > referenced against a table to see what codec it is, it's a standard used > by RIFF > (aka, wav and avi) and older Macintosh formats, and in my opinion, its > obsolete. > While it's true there are a bunch of FOURCC's that represent non-raw formats like DIVX etc, the ones

Hello, I want to make a program to extract frame from a theora movie as images. I tried with the decoding example located at theora web site (dump_video.c. I use it to extract a frame as yuv image but when I try to convert it to ppm with yuvtoppm program i obtain a strange image ( see http://poux.be/tmp/file.ppm ). I think it's a problem with the byte order for yuv, but don't I don't

Hi, On 2025/1/16 18:35, Dmitry Baryshkov wrote: > On Thu, Jan 16, 2025 at 11:17:50AM +0100, Geert Uytterhoeven wrote: >> On Thu, Jan 16, 2025 at 11:03?AM Tomi Valkeinen >> <tomi.valkeinen at ideasonboard.com> wrote: >>> On 16/01/2025 10:09, Thomas Zimmermann wrote: >>>> Am 15.01.25 um 15:20 schrieb Tomi Valkeinen: >>>> [...]