search for: yuv4mpeg

...d and done some sample test timings for encoding between libtheora-1.0 and libtheora-1.1beta3, as available from the Theora website [2]. So far, I've tested with 4 different files that I generated with content I already have. The files, in brief, are the following: 1. planet-earth-360x240.yuv4mpeg - A clip from the Discovery/BBC series Planet Earth from DVD 1, the "Mountains" chapter - the first 5000 frames (I dropped half the fields to get non-interlaced video, then rescaled) 2. kuala-lumpur-downtime-timelapse.yuv4mpeg - A time-lapse video clip I created...

...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 point in having pcm without yuv4mpeg. -r

As was briefly discussed on IRC, ffmpeg and mplayer currently output two somewhat incompatible YUV4MPEG streams. This meant that encoder_example could take input from mplayer, but not ffmpeg or movtoy4m (a QuickTime->Y4M tool). This is a patch that fixes this issue and should allow encoder_example to take input from either format: diff -urd xiph-cvs/theora/examples/encoder_example.c xiph-cvs-...

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]] i...

...it by hand (you may or may not want to bother, considering that both are A)merely examples and B)still in early 'alpha' testing, though in my limited experience thus far they both seem to perform reasonably well.) ENCODING: The encoder, as the README states, expects raw, uncompressed 'yuv4mpeg' data for video, and '.wav' files (pcm) for sound. As the readme also explains, mplayer ( http://www.mplayerhq.hu ) is an easy way to export from an existing video file to this format. It's not explicitly stated in the README, but the example encoder's output is to stdin, so t...

some of you may find this helpful: I've uploaded a short (5 second) raw clip in yuv4mpeg format, associated audio, and batch files to exercise the encoder & decoder examples. In addition I've included the file as compressed (test.ogg), and a longer version as well to test playback sync. Notes: to use MPlayer with the -vo yuv4mpeg option, you need to get the latest release and...

"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 17-Aug-08, at 1:11 AM, Silvia Pfeiffer wrote: > OK, then yuv4mpeg will have the magic number: char[8]: 'YUV4MPEG'. > Is that ok? Yes, I'm good with that. > Also, can you put the link to the spec into > http://wiki.xiph.org/index.php/MIMETypesCodecs ? Thanks! Sorry, I thought I'd dumped the spec into the wiki. It's there now, an...

Hello. I'm trying to encode an Ogg Theora file from an unencrypted dvd using mplayer and encoder_example. I set up named pipes stream.wav and stream.yuv. I then run: mplayer -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...

...s not for production use yet). I've download the source from CVS, and got it to build, with the example encoder and player. While trying to find something to serve as a good source of input, I decided I'd use a DVD, since the input would be of a good quality. Since dumping the stream to a yuv4mpeg file is prohibitively expensive on my system (no where near enough room), I decided I'd try encoding from two fifos. I set up mplayer to give me the output cd /tmp mkfifo stream.yuv mkfifo audiodump.wav mplayer -dvd 2 -vo yuv4mpeg -ao pcm That part works fine. I then set up encoder_example...

On Thu, Aug 14, 2008 at 9:14 PM, Silvia Pfeiffer wrote: > The IETF has a final draft of our RFC at > ftp://ftp.rfc-editor.org/in-notes/authors/rfc5334.txt (yes, it goes > from 3534 to 5334 - funny!). Didn't we decide YUV4MPEG should be 8 octets as well? -r

...e following clip: http://lives.reimeika.ca/cvs/swath.ogg As you can see there are a lot of obvious artifacts. I generate this movie using a series on PNG images and the following command sequence: mkfifo -m 0600 stream.yuv mplayer mf://*.png -mf type=png:fps=29.97002997 -vf dsize=16:9,hqdn3d -vo yuv4mpeg -ao null -nosound & encoder_example -s 8 -S 7 -f 30000 -F 1001 -v 10 -a 10 -o swath.ogg stream.yuv Any suggestions on how to improve this? In order to test I'm making available the LiVES video file (which is essentially a .tgz of the PNG images): http://lives.reimeika.ca/cvs/swath.lv1 To...

Greetings, I was on IRC about 7 hours ago and suggested that the FAQ be updated slightly. Rather than sit on my ass and complain I figured I'd ask a few people, and see if the idea was worth the time. Here's what Ive started with: http://www.dimension.net.nz/theora.html I'll be adding to it over the next 24 hours - mostly in the area of Playback and Encoding. Just threw it together

...stream.yuv && mencoder $input -ovc lavc -oac copy -o tmp.avi -lavcopts vcodec=mpeg1video:vbitrate=1200 -vf harddup -of mpeg && mplayer -vc dummy -vo null -ao pcm:file=stream.wav tmp.avi && encoder_example stream.wav stream.yuv > theora.ogg | mplayer -ao null -nosound -vo yuv4mpeg tmp.avi - 1>/dev/tty7 8>/dev/tty7 && rm stream.yuv && rm stream.wav && rm tmp.avi"); exit; } ### if ($divx eq "off") { system ("mkfifo stream.yuv && chmod 777 stream.yuv && mplayer -vc dummy -vo null -ao pcm:file=stream.wav $inpu...

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

...#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 >

...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

I did a little poking about with the pcm-from-fifo problem I was having... What I'm attempting to do is an on-the-fly export from one file using mplayer to generate yuv4mpeg video frames and pcm audio, piped through fifo's. This DOES work with mpeg2enc/mp2enc, so I'm assuming it's not a problem with, e.g., my filesystem... the example encoder appears to successfully open and begin reading the audio stream, but 'hangs' there. I just ran a test usi...

...espite the warnings on the website ;-) I played with the current CVS source of theora on Windows 2000 w/ Microsoft Visual C++. The codec and the "experimental" example programs compiled fine. I also encoded a 33 MB MPEG2 (?) video (3 minute trailer) to a 14 MB .OGG using "mplayer -vo yuv4mpeg -ao pcm" and the "encoderwin" sample program, and play it with the "splayer" sample program. Performance was okay on an 2.4GHz P-IV, although I was using debug binaries under VMWare. No crashes or other problems so far. Looking at the directory structure and the code I mus...

...e ICC chunk, anyway) or interlaced. BTW, there are already a number of general "raw" video formats in professional use; it's not just AVI we have as prior art. :) I'd like to see some discussion of the merits of adopting one of those if we want something more sophisticated than yuv4mpeg. And for the record, it's actually possible to write valid, uncompressed data in both MNG and FLAC: both formats have a no-predictor mode, and zlib itself has a verbatim encoding option to deal with "pathological" input blocks. So in theory we already have an uncompressed format t...