search for: colourspace

Hey everyone, according to Wikipedia's 4-year-old information, there is no standard for putting metadata into an Ogg file. That metadata must be included in the codec. For example, what if I want to make a Theora movie and include information about the color space or embed an ICC profile? Or can I include general textual information, like copyright? What about timecode? Brendan

...'s no container-level metadata. The 'mapping' specs for various sets of codecs embedded in Ogg describe how metadata is stored. > For example, what if I want to make a Theora movie and include information about the color space or embed an ICC profile? Theora only supports two fixed colourspaces--defined in the spec--and 'unspecified'. There's generic metadata, so you could do something custom with a base64-encoded ICC profile and an undefined colourspace flag if you want to track this, but we generally discourage that. Theora is a distribution format; it's best to convert...

...#2, serial: 00002bfc): type vorbis Theora headers parsed for stream 1, information follows... Version: 3.2.0 Vendor: Xiph.Org libTheora I 20060526 3 2 0 Width: 320 Height: 240 Total image: 320 by 240, crop offset (0, 0) Framerate 25/1 (25,00 fps) Pixel aspect ratio 1:1 (1,000000:1) Frame aspect 4:3 Colourspace: Rec. ITU-R BT.470-6 Systems B and G (PAL) Pixel format 4:2:0 Target bitrate: 0 kbps Nominal quality setting (0-63): 32 User comments section follows... ENCODER=ffmpeg2theora 0.18 Vorbis headers parsed for stream 2, information follows... Version: 0 Vendor: AO; aoTuV b5 [20061024] (based on...

Hi, I failed to run install.packages("imager") in CentOS 6, the R version is 3.2.2 g++ -shared -L/usr/local/r/3.2.2/lib64/R/lib -L/usr/local/lib64 -o imager.so RcppExports.o colourspace.o display.o drawing.o filtering.o interpolation.o morphology.o transformations.o utils.o wrappers.o -lX11 -lfftw3 -L/usr/local/r/3.2.2/lib64/R/lib -lR /usr/bin/ld: cannot find -lfftw3 I checked imager src/Makevars.win: PKG_LIBS += -L$(LIB_FFTW)/lib -lgdi32 -lfftw3-3 $(RCPP_LDFLAGS) And I've...

In response to (and with the help of) John Koleszar I put together an early draft of OggYUV.. or rather, a list of header fields for it. http://wiki.xiph.org/index.php/OggYUV Feedback (on list or on wiki) is most certainly solicited, especially on the chroma subsampling list (how many different sampling methods do we need to reasonably support?) and if we've missed any fields to date.

In response to (and with the help of) John Koleszar I put together an early draft of OggYUV.. or rather, a list of header fields for it. http://wiki.xiph.org/index.php/OggYUV Feedback (on list or on wiki) is most certainly solicited, especially on the chroma subsampling list (how many different sampling methods do we need to reasonably support?) and if we've missed any fields to date.

...02d44): type vorbis Theora headers parsed for stream 2, information follows... Version: 3.2.1 Vendor: Xiph.Org libtheora 1.1 20090822 (Thusnelda) Width: 512 Height: 224 Total image: 512 by 224, crop offset (0, 0) Framerate 25/1 (25,00 fps) Pixel aspect ratio 1:1 (1,000000:1) Frame aspect 2,285714:1 Colourspace unspecified Pixel format 4:2:0 Target bitrate: 0 kbps Nominal quality setting (0-63): 32 User comments section follows... ENCODER=ffmpeg2theora-0.24+svn16515 SOURCE_OSHASH=b999d843aa5547c7 Vorbis headers parsed for stream 3, information follows... Version: 0 Vendor: Xiph.Org libVorb...

...nly 20 used) //136 - 159 pictureheight (24 bits read, only 20 used) //160 - 167 xoffset (8 bits) //168 - 175 yoffset (8 bits) //176 - 207 framerateNum (32 bits) //208 - 239 frameratedenom (32 bits) //240 - 263 aspectNum (24 bits) //264 - 287 aspectdenom (24 bits) //288 - 295 colourspace (8 bits) //296 - 319 targetbitrate (24 bits) //320 - 325 targetqual (6 bits) //326 - 330 keyframeinterlog (5 bits) Giving a theora ident packet a total size of 42 bytes. Cheers Zen.

ok now I see why we need another packet in the header. The first one is basically for ID purposes (theora_decode_header()). I've jammed my huffman trees in there but it sucks because I need them later on when I actually build the huffman tree structs (theora_decode_init, calls InitHuffmanSet()). At that point the original header packet is gone so I've been keeping it around in a buffer.

...ified-arbitrary model, then there's a lot of extra processing work that has to be done in between. And just from a MS/directshow perspective, all the input devices, output devices and codecs support a fourcc, or common rgb model. It's all well and good to represent accurately some other colourspace, but considering no codec or output device will display it exactly as is, nor will it ever generate such data, i'm not sure i see the point in these implementations. Zen.

...al: 00000001): type vorbis Theora headers parsed for stream 1, information follows... Version: 3.2.1 Vendor: Xiph.Org libThusnelda I 20081201 Width: 720 Height: 480 Total image: 720 by 480, crop offset (0, 0) Framerate 2997/100 (29.97 fps) Pixel aspect ratio 1:1 (1.000000:1) Frame aspect 1.500000:1 Colourspace: Rec. ITU-R BT.470-6 System M (NTSC) Pixel format 4:2:0 Target bitrate: 0 kbps Nominal quality setting (0-63): 32 User comments section follows... ENCODER=ffmpeg2theora-0.24 Vorbis headers parsed for stream 2, information follows... Version: 0 Vendor: Xiph.Org libVorbis I 20070622 (1.2.0) C...

hi folks! i would like to know whether there will be some function to decode to some plain 24 bit RGB buffer in the future. i think this feature is sometimes important, especially when using different surface layers, or when modifying the buffer in realtime. if this feature will definitely not be, could someone tell me how i can convert to some RGB buffer in realtime? i already tried different

hi folks! i would like to know whether there will be some function to decode to some plain 24 bit RGB buffer in the future. i think this feature is sometimes important, especially when using different surface layers, or when modifying the buffer in realtime. if this feature will definitely not be, could someone tell me how i can convert to some RGB buffer in realtime? i already tried different

Hi, I was wondering what are this forum's collective thoughts on the best way to support video color fidelity greater than what we have today. I am not a video developer myself. I edit video. A type of problems I come across fairly often, have to do with the limited color depth of the digital video medium. They often manifest themselves as "cartoonish" areas of adjacent flat

Hey everyone, I just got Theora running on my Mac, and ran across several hurdles, that I was wondering if someone could help me with. I do a lot of tech support at work, and get the same questions over and over, so I tried skimming the archives but couldn't find the answers. Maybe these could go in a FAQ of some sort? These are fairly unavoidable issues that should probably be