tag:blogger.com,1999:blog-486004628906665560.post7402120296981235995..comments2022-04-24T04:36:42.160+00:00Comments on The Vcodex blog: news, tutorials and tips about video compression. http://vcodex.com.: HEVC: is it really twice as good as H.264?Anonymoushttp://www.blogger.com/profile/05614776608235333089noreply@blogger.comBlogger20125tag:blogger.com,1999:blog-486004628906665560.post-88189737309138886232013-12-17T05:09:13.227+00:002013-12-17T05:09:13.227+00:00Very Informative, Thanks a Lot Ian ..Very Informative, Thanks a Lot Ian ..Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-54852312105608000192013-10-14T12:35:42.476+00:002013-10-14T12:35:42.476+00:00Hi All,
Where can i get test bit-streams for main...Hi All,<br /><br />Where can i get test bit-streams for main-still picture profile? And yuv for test images.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-44141083571647628282013-09-04T06:49:52.701+00:002013-09-04T06:49:52.701+00:00Hi
Instead of trying to decode the HM10 bitstream...Hi<br /><br />Instead of trying to decode the HM10 bitstream, I would suggest downloading HM11 anchor bitstreams instead: ftp://ftp.kw.bbc.co.uk/hevc/hm-11.0-anchors/<br /><br />- Iain<br />Anonymoushttps://www.blogger.com/profile/05614776608235333089noreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-30636846558292477832013-09-03T21:53:18.389+00:002013-09-03T21:53:18.389+00:00Hi Iain,
I downloaded hm10 bitstream from site yo...Hi Iain,<br /><br />I downloaded hm10 bitstream from site you gave in post, and tried to decode it with tappdecoder (from HM11) and got this erro:<br /><br />http://postimg.org/image/un16auskd/<br /><br />Is that because newer HM can't decode older HM bitstreams?<br /><br />If you have tappdecoder from HM10, can you upload it?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-10148980808157232772013-07-16T05:21:21.314+00:002013-07-16T05:21:21.314+00:00This is cool!This is cool!Veldahttp://topconvertiblecarseatreviews.net/noreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-81168194079558530972013-03-16T10:18:55.308+00:002013-03-16T10:18:55.308+00:00Sean - I used an HEVC anchor sequence, please see ...Sean - I used an HEVC anchor sequence, please see the link to these clips. The configuration settings are listed in a JCT-VC document, if I remember correctly. I'll add the x264 command line parameters shortly.<br />- IainAnonymoushttps://www.blogger.com/profile/05614776608235333089noreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-15854006138523111262013-03-16T10:04:33.262+00:002013-03-16T10:04:33.262+00:00Do you mind posting the .cfg file you used with th...Do you mind posting the .cfg file you used with the reference HEVC encoder...or did you just use one of the default .cfg files that come with HM10? (However, I'd venture a guess that you probably tweaked at least some of those numerous parameters) :) Also, Do you mind posting what x264 parameter values you used to create your h264 comparison? Sean Duncannoreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-25890175935429517612013-03-13T20:21:08.596+00:002013-03-13T20:21:08.596+00:00Yes I will put together some short YUV clips...Yes I will put together some short YUV clips...Anonymoushttps://www.blogger.com/profile/05614776608235333089noreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-21755805212187633722013-03-13T20:02:48.392+00:002013-03-13T20:02:48.392+00:00Great blog post, Iain,
Any movement on generating ...Great blog post, Iain,<br />Any movement on generating some short downloadable clips for evaluation/comparisons?<br /><br />DSEhttps://www.blogger.com/profile/11765149331987656853noreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-29071403402008042192013-03-13T20:01:39.539+00:002013-03-13T20:01:39.539+00:00Great post, Iain.
Any chance of some downloadable...Great post, Iain. <br />Any chance of some downloadable short clips being forthcoming?DSEhttps://www.blogger.com/profile/11765149331987656853noreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-34901386107776757032013-03-09T11:54:19.422+00:002013-03-09T11:54:19.422+00:00Nice to see the debate around this topic. I will l...Nice to see the debate around this topic. I will look into generating some sample clips that can be downloaded and compared.Anonymoushttps://www.blogger.com/profile/05614776608235333089noreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-11303552890999839152013-03-09T04:53:49.184+00:002013-03-09T04:53:49.184+00:00I think taking a still image out of a moving video...I think taking a still image out of a moving video which it has been optimized to is not a good way of judging stuff. <br /><br />Most importantly dancing noise is impossible to see on a still but obvious on a video. I think I will trust the pros and vector encoding with more info in less space until I see it at NAB. Also, how about an example with modern 1080p instead of 720 and who shoots 480i?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-67826589842577815742013-03-08T23:06:01.324+00:002013-03-08T23:06:01.324+00:00Very interesting results!
I have also read the fol...Very interesting results!<br />I have also read the following papers, which compares HEVC and H264, without however noticing the details of your listing. <br />However, they report some interesting findings on the performance of the two codecs. <br />http://aias.iit.demokritos.gr/~koumaras/EuroITV%20KOUMARAS-%20Camera%20ready.pdf<br /><br />and <br /><br />http://aias.iit.demokritos.gr/~koumaras/KOUMARAS_ICT_CAMERA%20READY.pdf<br /><br />It seems that the performance of HEVC is doubled in comparison to AVC, but especially in the temporal domain. In the spatial domain, needs more investigation (in cases of half bit rate).<br /><br />Please keep posting more results.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-55809100193142561822013-03-08T21:19:57.691+00:002013-03-08T21:19:57.691+00:00I'm going to suggest that you're looking a...I'm going to suggest that you're looking at the issue from the wrong perspective, Ian. The codec isn't about using half the resources to be as good, it's about a fixed pipe capacity delivering more channels. Whether its fibre and the 'conversations' or its digital transmission, broadcasters have the key issue of more channels of content in a fixed volume of delivery channel. Now, add 4K, or yet another must have home device and the new iteration of the codec is essential. I'm guessing that even 6months of scrutiny and shaping will improve it greatly. Thanks for the great work, by the way.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-89688605088877191102013-03-08T08:59:46.312+00:002013-03-08T08:59:46.312+00:00Very interesting paper by Zhou Wang, I'll upda...Very interesting paper by Zhou Wang, I'll update the blog with a link. Thanks for the comment.Anonymoushttps://www.blogger.com/profile/05614776608235333089noreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-1960620423295179102013-03-08T07:32:28.535+00:002013-03-08T07:32:28.535+00:00Zhou Wang had a paper on this: https://ece.uwaterl...Zhou Wang had a paper on this: https://ece.uwaterloo.ca/~z70wang/publications/vpqm13.pdf<br /><br />Long story short, the magic of HEVC is in its massive reduction of temporal artifacts, not necessarily spatial ones. <br /><br />In fact, the paper continues to detail tests showing how subjective analysis of stillframes will significantly underestimate the quality of a clip as a whole.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-28978743746461037372013-03-07T10:46:33.259+00:002013-03-07T10:46:33.259+00:00Hello Markus, thanks for the comment. If you follo...Hello Markus, thanks for the comment. If you follow the link you can download the original YUV sequences yourself - you will need software such as GLYUVPlay to play them. <br /><br />It's common practice to compare the output of different processes without the original (reference). For example, Absolute Category Rating and Pair Comparison (ITU-T P.910) and Single Stimulus Continuous Quality Evaluation (ITU-T BT.500) are all methods of no-reference subjective quality testing.<br />- Iain.<br />Anonymoushttps://www.blogger.com/profile/05614776608235333089noreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-77371320999172985572013-03-07T00:33:52.550+00:002013-03-07T00:33:52.550+00:00Could you please add the uncompressed input images...Could you please add the uncompressed input images a reference to compare against? How can you compare the output of two lossy codecs without looking at the input?Markushttps://www.blogger.com/profile/03781441235152966673noreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-67163018835487948252013-03-06T10:36:26.766+00:002013-03-06T10:36:26.766+00:00Thanks Misha, good point. I agree about the visibl...Thanks Misha, good point. I agree about the visible artefacts in the H.264 frame. However, what concerns me about the HEVC frame is the loss of information. Comparison of moving images requires a real time decoder or playing back the full raw decoded files. I'll be posting more results and examples soon.<br />- Iain<br />Anonymoushttps://www.blogger.com/profile/05614776608235333089noreply@blogger.comtag:blogger.com,1999:blog-486004628906665560.post-42023885606079226642013-03-06T03:05:56.469+00:002013-03-06T03:05:56.469+00:00Thank you for an interesting comparison. With ref...Thank you for an interesting comparison. With reference to Sara, I agree that the HEVC frame looks smoother in comparison to the H.264 frame, but it's also lacking some of the artifacts that the H.264 frame suffers from. For example, the blue background to the left of the face looks a bit "noisy", and ringing around the edges appears stronger for H.264.<br /><br />I'm not sure what's worse: more blur or stronger artifacts. It'd be interesting to see how they stand out in an actual moving picture. I'm looking forward to seeing more results.Anonymoushttps://www.blogger.com/profile/09657194319507369108noreply@blogger.com