search for: yuv4mpeg2

hi all as the input stream for the "encoder_example", it could give "YUV4MPEG2" file, can we use any other file type.....? insted of "YUV4MPEG2" file, i want to use "rawvideo" file , because i want to compare theora with xvid codec. so that i need to encode a video (same video) using both theora and xvid. but both these codecs does not operate on...

Hi all I have the raw out put of a video camera in following format: mjpegb, yuvj422p, 1920x1080, 24.00 fps(r). I cannot directly convert this raw footage to Theora due to the YUV4MPEG2 only restriction of the encoder_example. Isn't it better to support other raw formats in encoder_example, such as what I have, mjpegb, yuvj422p? I presume even if I convert the mjpegb, yuvj422p to YUV4MPEG2, I cannot convert it losslessly. Best Regards Unga ______________________...

On 5/24/08, Conrad Parker <conrad at metadecks.org> wrote: > The magic is not always char[8] -- it's an arbitrary number of > characters, and as far as I know there is no official limit. I was under the impression that 8 was the limit. Thus the extra white space JM adds on Speex and CELT magics. I may be wrong, though. > So it's 7 for Vorbis and Theora, 5 for FLAC So

2008/5/29 Ralph Giles <giles at xiph.org>: > On 28-May-08, at 6:20 PM, Conrad Parker wrote: > >> /* TODO: this should check against 42 for the relevant version numbers */ >> if (op->bytes < 41) return 0; > > I gather this means the USE_THEORA_PRE_ALPHA_3_FORMAT #if should instead be > based on the length of the header packet. I'm not sure why you're

On 8/17/08, Silvia Pfeiffer <silviapfeiffer1 at gmail.com> wrote: > OK, then yuv4mpeg will have the magic number: char[8]: 'YUV4MPEG'. Which was previously for those not paying attention char[9]: 'YUV4MPEG2'. > Also, can you put the link to the spec into > http://wiki.xiph.org/index.php/MIMETypesCodecs ? AFAIK, that is just a matter of putting a [[OggUVS]] in there. At least that's what I reckon to be the spec for YUV4MPEG encapsulation. -Ivo

Hi, Can we encode a normal stream in to black & white video using exsisting encoder_example in theora_beta2. Is it required to change encoder_example file to do that? So please guide to do that. Thanks... -- ___ -------------- next part -------------- An HTML attachment was scrubbed... URL:

hi all, i tried to encode a .yuv file with the encoder_example.c but it give an error message as follows ./encoder_example -v 1 file_1.yuv > file_1.ogg Input file file_1.yuv is neither a WAV nor YUV4MPEG2 file. so the error message is understandable for anyone. when this file is play with mplayer it shows as follow ========================================================================== Opening video decoder: [raw] RAW Uncompressed Video VDec: vo config request - 176 x 144 (preferred colorsp...

...capture-`date +%F-%T`.ogv | oggfwd -d 'Live webcam view of me at work' -g 'Webcam' -n 'Basil at work' aalimraan.hidayahonline.net 8000 ***secret*** /basil-at-work.ogv As you can see from that, the stream is 640x480 at 15 fps. I capture it with ffmpeg, convert it to a 4:2:0 YUV4MPEG2 stream, which I then pipe to the example_encoder bundled with libtheora. I am encoding the stream to 150 kbps (150/8 = 18.75 kB/s). I am NOT doing any audio encoding, since I'm at work, so that does save me some bits. Take a look at the video and see what you think. I'll try to keep it...

...#39;\211PNG\r\n\032\n' | png > char[8]: '\212MNG\r\n\032\n' | mng > char[8]: '\213JNG\r\n\032\n' | jng > char[8]: 'CELT ' | celt > char[8]: 'PCM ' | pcm > char[9]: '\x80kate\0\0\0\0' | kate > char[9]: 'YUV4MPEG2' | yuv4mpeg > > (Don't expect it to look pretty without a monospaced font) > > -Ivo > _______________________________________________ > ogg-dev mailing list > ogg-dev at xiph.org > http://lists.xiph.org/mailman/listinfo/ogg-dev >

...[8]: "\212MNG\r\n\032\n" mng char[8]: "\213JNG\r\n\032\n" jng Are the 'Codecs Parameter' values from a different namespace from the media-types? Do we define a mapping where there is one, e.g. vorbis is audio/vorbis? And there's OggY4M which uses char[9]: "YUV4MPEG2" but that's in no way finalized. -r

...#39;\211PNG\r\n\032\n' | png > char[8]: '\212MNG\r\n\032\n' | mng > char[8]: '\213JNG\r\n\032\n' | jng > char[8]: 'CELT ' | celt > char[8]: 'PCM ' | pcm > char[9]: '\x80kate\0\0\0\0' | kate > char[9]: 'YUV4MPEG2' | yuv4mpeg > > (Don't expect it to look pretty without a monospaced font) > > -Ivo > _______________________________________________ > ogg-dev mailing list > ogg-dev at xiph.org > http://lists.xiph.org/mailman/listinfo/ogg-dev >

...quot;Silvia Pfeiffer" <silviapfeiffer1 at gmail.com> wrote: ... > Also, it would be good if we can keep > our magic numbers to the first 8 bytes. So Kate and Yuv4mpeg both need to be trimmed. ... >>> char[9]: '\x80kate\0\0\0\0' | kate >>> char[9]: 'YUV4MPEG2' | yuv4mpeg Regards, Martin -- Martin J Leese E-mail: martin.leese stanfordalumni.org Web: http://members.tripod.com/martin_leese/

On Sun, May 25, 2008 at 2:53 AM, Ralph Giles <giles at xiph.org> wrote: > On 24-May-08, at 9:26 AM, Ivo Emanuel Gon?alves wrote: > > And there's OggY4M which uses char[9]: "YUV4MPEG2" but that's in no > way finalized. I was unable to find any documentation on this on the Web. Would you have a link to the mapping? BTW, I have now finalized a first version of the codecs table on the wiki: http://wiki.xiph.org/index.php/MIMETypesCodecs. Please assume typos and check...

On Sat, Aug 16, 2008 at 12:23 AM, Silvia Pfeiffer wrote: > Have we got a spec? If not, we may want to remove it altogether and > make the fixes in our wiki as the spec develops. We have a draft spec with no implementation. I can't imagine the magic changing, so I think it's ok to leave it in, but I'm ok to remove it if you think that's best. I do think there's little

I have encoded successfully a YUV stream by using the encoder_example. Can We encode a row stream (get from a web cam) by using encoder_example. If we can not, is there any other way to encode a row stream by using theora codec. -- Nuwan Millawitiya -------------- next part -------------- An HTML attachment was scrubbed... URL:

Hi, We want to get a B&W output from any video input (B&W or Color). So when we encoded into B&W video compression will be increased is it correct? Can we archive this by a existing encoder_example. -- ___ -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/theora/attachments/20080121/c1d1b3c1/attachment.htm

I have encoded successfully a YUV stream by using the encoder_example. Can We encode a row stream (get from a web cam) by using encoder_example. If we can not, is there any other way to encode a row stream by using theora codec. -- Nuwan Millawitiya -------------- next part -------------- An HTML attachment was scrubbed... URL:

...is part of the media types regardless of namespace, but it's just a string to describe each contained codec not a specific media type like what is used in Skeleton. Here's an example: video/ogg; codecs="theora, vorbis, kate" > And there's OggY4M which uses char[9]: "YUV4MPEG2" but that's in no > way finalized. So this shouldn't be added, right? -Ivo

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.