Thats good to know. Decoding in vlc already uses the schrodinger code, but unfortunately frame accurate seeking for ogg/dirac cannot be switched on yet as it requires communication between demuxer and decoder, which is not yet implemented in vlc.
The latest versions of LiVES do provide ogg/dirac frame accuracy, so using that you can even vj with dirac and play in reverse (at about 20% full frame rate) :-) As soon as I find a good commandline muxer I can implement ogg/dirac encoding in LiVES too, which has been a goal of mine for a long time too. Regards, Salsaman. http://lives.sourceforge.net https://www.ohloh.net/accounts/salsaman On Tue, Nov 2, 2010 at 7:48 PM, Anuradha Suraparaju <asurapar...@gmail.com> wrote: > I am working on encoding Dirac using Schro encoder in VLC. It should be > ready for testing in a week or two. I'll post a patch to the Schro > developers list. Currently, the dirac-research implementation is used in VLC > for coding Dirac and it is very slow. So using Schro should speed up the > encoding. > > Regards, > Anu > > On Tue, Nov 2, 2010 at 12:36 AM, salsaman <salsa...@gmail.com> wrote: >> >> On Mon, Nov 1, 2010 at 7:30 AM, Tim Borer <tim.bo...@bbc.co.uk> wrote: >> > Hi, >> > >> > I would be interested to hear the results of experiments comparing Dirac >> > Pro >> > and J2K. I assume you will be comparing Intra Dirac, i.e. Dirac >> > Pro/SMPTE >> > VC-2, with J2K? >> > >> > As you say Dirac Pro's entropy modelling is quite different to J2K. I >> > doubt >> > it yields a higher compression ratio - the objective with Dirac Pro was >> > to >> > produce a simpler, less complex solution rather than a higher >> > compression >> > ratio. However I would add that, because Dirac Pro takes care to >> > preserve >> > the DC precision it can have fewer visual artefacts than J2k (even if >> > PSNR >> > figures don't show this). I say this because we have noticed that J2K, >> > used >> > for video, can produce an annoying DC flicker even at quite low >> > compression >> > ratios. >> > >> > I did some (unpublished) experiments a few years ago comparing J2K and >> > Dirac >> > Pro. With arithmetic coding enabled the compression efficiency (for >> > lossless >> > coding) was almost identical for the two codecs (some images were 1 or >> > 2% >> > better with one codec and the other way round for other images). >> > Interestingly when arithmetic coding was disabled, so that entropy >> > coding >> > was only the fixed variable length coding (interleaved exp-Golomb), the >> > compression efficiency of Dirac Pro only dropped by 20%. That is for >> > lossless coding arithmetic coding only appeared to give a compression >> > gain >> > of 1.25. Given that arithmetic coding adds significantly to the >> > complexity >> > of the codec some applications may prefer the option of not using >> > arithmetic >> > coding in Dirac Pro for lower complexity at the expense of slightly >> > reduced >> > compression. >> > >> > At the moment there are low delay profile hardware implementations of >> > Dirac >> > Pro/SMPTE VC-2 available from Numedia Technology and from Westwood Rock. >> > Software implementations are available in the Open Source Schroedinger >> > software and from Entropy Wave. >> > >> > Regards >> > >> > Tim >> > >> > Dr Tim Borer >> > Lead Engineer >> > BBC Research & Development >> > BBC Centre House >> > 56 Wood Lane >> > London W12 7SB >> > >> >> Hi Tim, >> Glad to hear somebody is actively working with dirac. I got the >> impression when I was rewriting the ogg/dirac demuxers for LiVES and >> VLC that nobody was really using the dirac format any more. >> >> Regards, >> Salsaman. >> >> >> >> http://lives.sourceforge.net >> https://www.ohloh.net/accounts/salsaman >> >> >> >> http://lives.sourceforge.net >> https://www.ohloh.net/accounts/salsaman >> >> > At 20:46 30/10/2010, javasharp...@ukr.net wrote: >> > >> > Hi, >> > >> > I want to do some experiments with dirac and j2k and I have a question. >> > As I >> > see dirac's entropy modelling is totally different from that of j2k. It >> > would be interesting to know the rationale behind it. In particular if >> > the >> > j2k's entropy modelling (together with the dirac's arithmetic encoder >> > which >> > as I understans is more effective than j2k's quasi-arithmetic encoder) >> > what >> > size decrease can be expected? >> > >> > Thanks in advance, >> > Vladimir >> > >> > >> > >> > ------------------------------------------------------------------------------ >> > Nokia and AT&T present the 2010 Calling All Innovators-North America >> > contest >> > Create new apps & games for the Nokia N8 for consumers in U.S. and >> > Canada >> > $10 million total in prizes - $4M cash, 500 devices, nearly $6M in >> > marketing >> > Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store >> > http://p.sf.net/sfu/nokia-dev2dev >> > _______________________________________________ >> > Schrodinger-devel mailing list >> > Schrodinger-devel@lists.sourceforge.net >> > https://lists.sourceforge.net/lists/listinfo/schrodinger-devel >> > >> > >> > No virus found in this incoming message. >> > Checked by AVG - www.avg.com >> > Version: 9.0.864 / Virus Database: 271.1.1/3225 - Release Date: 10/28/10 >> > 18:34:00 >> > >> > >> > ------------------------------------------------------------------------------ >> > Nokia and AT&T present the 2010 Calling All Innovators-North America >> > contest >> > Create new apps & games for the Nokia N8 for consumers in U.S. and >> > Canada >> > $10 million total in prizes - $4M cash, 500 devices, nearly $6M in >> > marketing >> > Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store >> > http://p.sf.net/sfu/nokia-dev2dev >> > _______________________________________________ >> > Schrodinger-devel mailing list >> > Schrodinger-devel@lists.sourceforge.net >> > https://lists.sourceforge.net/lists/listinfo/schrodinger-devel >> > >> > >> >> >> ------------------------------------------------------------------------------ >> Nokia and AT&T present the 2010 Calling All Innovators-North America >> contest >> Create new apps & games for the Nokia N8 for consumers in U.S. and Canada >> $10 million total in prizes - $4M cash, 500 devices, nearly $6M in >> marketing >> Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store >> http://p.sf.net/sfu/nokia-dev2dev >> _______________________________________________ >> Schrodinger-devel mailing list >> Schrodinger-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/schrodinger-devel > > ------------------------------------------------------------------------------ Achieve Improved Network Security with IP and DNS Reputation. 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