search for: gmaxwell

Chris DiBona made an odd comment regarding Theora on the WhatWG list. I am explicitly not calling for people to go sign up over there and complain. Google has done many good things for open video, and I'm sure they will continue to do so in the future. I thought the comparison I did for my response would be interesting to other people here:

...ora. While playing with this I found some behaviour in the rate control with respect to the minimum quality knob which I think is undesirable, so I've prepared a test encode with that behaviour changed. I'm interested in opinions on these three clips: http://myrandomnode.dyndns.org:8080/~gmaxwell/theora/nolimit.ogv http://myrandomnode.dyndns.org:8080/~gmaxwell/theora/limit.ogv http://myrandomnode.dyndns.org:8080/~gmaxwell/theora/limitmod.ogv If limitmod and limit are looking too similar to you, an example of how they differ is at about 35 seconds in around the words "basic outline of...

...you the best performance. This graph shows the quality of CELT at two error rates (1:100 and 1:1000) as a function of the position where the errors occur, along with additional lines showing the performance for zero loss and packet loss at the same two rates. http://myrandomnode.dyndns.org:8080/~gmaxwell/celt/error.sweep3.png The lower the line, the worse the quality. Because of the scale of the graph it looks like for some portions of the frame the errors are completely harmless. But this is an artefact of the graph scaling: All errored cases sound worse than the non-errored, but some sound pret...

Erik de Castro Lopo wrote: >> I've just grabbed a copy of SVN head for libogg and 'make check' >> is failing: >The breakage happened in this commit: > > r17098 | gmaxwell | 2010-03-29 16:35:11 +1100 (Mon, 29 Mar 2010) | 1 line > Firstly, is gmaxwell on this list? [snip] > Secondly should be be trying controvertial changes in HEAD? Surely thats > what separate branches are for, so that the trunk never breaks like this. Nothing is broken. The libogg test-ca...

Hi all, I've just grabbed a copy of SVN head for libogg and 'make check' is failing: ./test_framing testing single page encoding... 0, (0), granule:0 ok. testing basic page encoding... 0, (0), granule:0 1, (1), granule:6151 ok. testing basic nil packets... 0, (0), granule:0 1, (1), granule:10247 ok. testing initial-packet lacing > 4k... 0, (0), granule:0

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...:stuartmarsden at finmars.co.uk>> > Subject: [opus] Opus Major Version Benchmarks on Raspberry Pi > To: "opus at xiph.org <mailto:opus at xiph.org>" <opus at xiph.org > <mailto:opus at xiph.org>> > Cc: Gregory Maxwell <gmaxwell at gmail.com <mailto:gmaxwell at gmail.com>> > Message-ID: > <CALPi7JckeXBzKuE2M4iG5iH91M=joj6uNO=RsTVb+qt04mKsQw at mail.gmail.com > <mailto:RsTVb%2Bqt04mKsQw at mail.gmail.com>> > Content-Type: text/plain; charset="iso-8859-1&q...

...irectory compilation terminated. make: *** [/opus-tools-0.1.7/src/audio-in.o] Error 1 but then i have this error: error: undefined reference to 'opus_multistream_surround_encoder_create', this I think that is for I'm not using 1.0.3 thanks in advance 2013/10/28 Gregory Maxwell <gmaxwell at gmail.com> > On Mon, Oct 28, 2013 at 11:11 AM, Antonio Juan <anquegi at gmail.com> wrote: > > this ask for me for the speex > > library, > > Can you explain this in some more detail? opus-tools makes no use of > the speex library. > > What messages are y...

...; Message: 1 >> Date: Thu, 19 Dec 2013 20:06:57 +0200 >> From: Stuart Marsden <stuartmarsden at finmars.co.uk> >> Subject: [opus] Opus Major Version Benchmarks on Raspberry Pi >> To: "opus at xiph.org" <opus at xiph.org> >> Cc: Gregory Maxwell <gmaxwell at gmail.com> >> Message-ID: >> <CALPi7JckeXBzKuE2M4iG5iH91M=joj6uNO=RsTVb+qt04mKsQw at mail.gmail.com> >> Content-Type: text/plain; charset="iso-8859-1" >> >> I wanted to roughly benchmark how the different version of libopus >> performed at e...

Jean-Mark, Tim, Could either of you expound on the following comment in cwrs.c? /*If _k==0, the following do-while loop will overflow the buffer.*/ ---------------------------------------------------------------- ...because the following do-loop does overflow the buffer when k=126 k=2; do _u[k]=(k<<1)-1; while(++k<len); Thanks, MikeH -------------- next

...--------------------------------------------- Message: 1 Date: Thu, 19 Dec 2013 20:06:57 +0200 From: Stuart Marsden <stuartmarsden at finmars.co.uk> Subject: [opus] Opus Major Version Benchmarks on Raspberry Pi To: "opus at xiph.org" <opus at xiph.org> Cc: Gregory Maxwell <gmaxwell at gmail.com> Message-ID: <CALPi7JckeXBzKuE2M4iG5iH91M=joj6uNO=RsTVb+qt04mKsQw at mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" I wanted to roughly benchmark how the different version of libopus performed at each complexity level for a 6kbit/s output opus file....

Wow. Let me say that again, just in case you missed it. Wow. The quality looks to be on par with what I get out of H.264, but Theora has the added benefit of free and open source software with no patent worries so I can use it with a clean conscience. Thanks, everyone.

It's been brought to my attention that Mozilla will be changing their implementation of <video/> to default deny cross-site requests. (http://www.w3.org/Bugs/Public/show_bug.cgi?id=6104) In other words: <video src="http://someothersite/videos.ogg"/> Will not work by default. It will not work like the <img/> tag does, or like the embed/object tags do which are

...le up by 2 here, but instead it's done when mixing the windows */ + yp0[0] = S_MUL(re,t0) + S_MUL(im,t1); + yp0[1] = S_MUL(re,t1) - S_MUL(im,t0); + } } /* Mirror on both sides for TDAC */ Regards, Marcello On 05/02/2014 18:46, "Gregory Maxwell" <gmaxwell at gmail.com> wrote: >On Wed, Feb 5, 2014 at 8:05 AM, Marcello Caramma (mcaramma) ><mcaramma at cisco.com> wrote: >> Hi, >> >> Apologies if this is a known issue, but running make on revision >>e3187444692195957eb66989622c7b1ad8448b06 fails one of the tests w...

I've heard this second hand and haven't had the time to confirm its vericity. Can someone confirm this is the case? If so, what were these people thinking? Removing support for the only video format that is sure to be installed in every Linux box somehow promoves the OS adoption? You get a WTF award LF, congrats. -Ivo

...ple page to replicate this test in that manner. The two files I used for testing were the following: http://media.basilgohar.com/preview/theora/balcony-2-vga30p.y4m-q10.ogv http://media.basilgohar.com/preview/theora/balcony-4-vga30p.y4m-q10.ogv What inspired me to make this test is the fact that gmaxwell (I think) in #theora mentioned the problem, and linked to a reddit comment he made in response to someone's criticism of libtheora's quality compared with some H.264 video. I thought to just test VLC first, but when I noticed it again in SMplayer, I just decided to test all the players tha...

Hi all, I am the developer of the llcon software (llcon.sf.net) which is a software making it possible for musicians to play in real-time over the internet. Up to now I have used ADPCM or no audio coding. Gregory Maxwell was pointing me to the great CELT project. Using CELT has the advantage to be able to use higher sample rates, getting lower code rate and better error concealment. I have

...target rate even when faced with some difficult-to-encode frames. I think this test is a useful one in demonstrating Theora's feasibility as a high-quality, intra-only codec. Furthermore, it also shows that even in such a simple case as an intra frame (a.k.a., keyframe), gains can be had, as gmaxwell observed that some optimizations could made to improve quality even further. So, it is my hope that this test will spur further interest in Theora as a consumer video device codec, and in particular, an intra-only subset of the libtheora codec. I am looking forward to further improvements in this...

Dear Sir, dear Madam, I am currently working with the European Commission on a pilot assessment of Video Codecs in eGovernment, more precisely for live video streaming of parliamentary sessions. The results of the analysis will be published for public consultation on IDABC <http://ec.europa.eu/idabc/en/home> website. The following video codecs are on the list: H.264/AVC, VC-1,

...----------- > > Message: 1 > Date: Thu, 19 Dec 2013 20:06:57 +0200 > From: Stuart Marsden <stuartmarsden at finmars.co.uk> > Subject: [opus] Opus Major Version Benchmarks on Raspberry Pi > To: "opus at xiph.org" <opus at xiph.org> > Cc: Gregory Maxwell <gmaxwell at gmail.com> > Message-ID: > <CALPi7JckeXBzKuE2M4iG5iH91M=joj6uNO=RsTVb+qt04mKsQw at mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > I wanted to roughly benchmark how the different version of libopus > performed at each complexity level for...