Hey Kwag,
Sorry about Divx. :( Seems jorel was the one to malign Divx. :? -black prince |
Hey guys, I like DivX too :D. The compression techniques used on it are beyond MPEG-1 and MPEG-2. It's just that it's not as handy as MPEG-1 or MPEG-2, because not every (Only one!) DVD player can play them. Only the "KISS" DVD player supports MPEG-4, and they're probably having a hard time trying to keep up with firmware patches and upgrades to support every MPEG-4 combination out there and keep the users happy :roll:
-kwag |
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Maybe we can get the best result at every resolution with CQ_VBR after all of this is optimized :!: -kwag |
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* DCT blocks are much less visible at 704x480, so no Blockbuster should be needed * Below that resolution blockiness starts to become a distraction (at least to me) * CQ mode cannot be used in conjunction with Blockbuster without a specially tuned Q matrix that isn't suitable for any other use * CQ_VBR mode can be used with or without Blockbuster using the same Q matrix My thinking, then, is that the 704x480 template should use CQ mode and no Blockbuster for the best quality. All lower resolutions should use CQ_VBR with Blockbuster variance 0-2 (depending on the movie). This may mean a difference Q matrix for the 704x480 template than the others, but that's not such a big deal. |
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I do see a clear improvement with the mods. on the low frequency area of the matrix. And as you say, DCT blocks will probably never be completely eliminated, but I see a smoother blend on DCT blocks even at 704x480, which help the overall visual experience on the picture. It would be nice to be able to have an "MPEG spectrum analyzer" to analyze a difficult dark scene full of DCT blocks, as this would give us an accurate picture of the exact problematic area, and we would have the exact frequency domain to work on that specific matrix area. That would be cool, instead of shooting in the dark :? -kwag |
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Although i've got no evidence on me to prove it, I do feel that even at 544(528)x576 I get much better quality using CQ mode and using no blockbuster. To me blockbuster only becomes effective at 352x??? resolutions. Jim |
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This doesn't sound too difficult, but it would be a lot of output through which to wade unless one were testing with very small frame sizes (say, 32x32 in a known problem area). |
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I haven't touched the Intra, because I like the results much better with the 16's 8) BTW: Here's my "compare.avs" script I'm using to test: Code:
LoadPlugin("C:\encoding\MPEG2DEC.dll") -kwag |
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you write: "I’m just teasing Don’t malign Divx too much. File prediction is now an important part of the KVCD process, but remember when the idea started with Ozzie’s very long avs script using Trim, then he cames up with SelectRangeEvery(). You’ll be interested to know he got it from Divx’s compression test. I believe you are raising the bar for picture quality for all methods of video backup to reach and that’s what’s important to me. I used Gknot for some time and created a lot of Divx’s only to be played on my PC. I wanted more portability in playing movies with the best picture quality possible. KVCD has not disappointed me and others. You are reaching for picture quality that could very well become the standard for others to reach, not just Divx. I wish I had skills like you, SansGrip, and other technical developers, but I know enough to realize what’s happening at KVCD is very promising." yes,i'm with you....... -------------- and i write (with this part quote from Kwag): You all encourage us to push all this stuff to the limits. And the "NAH" sayers at other sites encourage us to go beyond the standards and over the limits ( which then pushes them to oblivion) really,really,really! Kwag,we are with you! ------------ and you again: (:-@ "Seems jorel was the one to malign Divx. :?" are you blame me? where i write something like this? are you :x and :? ? what you talking about???????? |
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Theoretically, a Q factor of 16 for all frequencies of the P and B frames should cause a significant increase in quality, since it quantizes less than the current KVCD Q matrix. My main concern would be the drop in the compression ratio, but if you say it's not significant then that's fine. Of course, it is the "standard MPEG" non-intra-frame matrix... but we shouldn't be biased against it just because of that :mrgreen:. Quote:
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Now testing with 16s... |
Hey Kwag,
I liked your compare.avs script. Have you or SansGrip tried this utility "avscompare" to compare the effects of different filters. Here's the link: http://forum.doom9.org/showthread.ph...ght=avscompare I'm using it to compare a script with CQ Blockbuster and one without :) See what you think. -black prince |
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BTW, new version of Blockbuster at my site... |
Hi jorel,
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I think you are saying if the picture quality keeps getting better using KVCD CQ we won't be limited to using Divx on the PC. :) I believe we are both in agreement. :) -black prince |
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"You all encourage us to push all this stuff to the limits. And the "NAH" sayers at other sites encourage us to go beyond the standards and over the limits ( which then pushes them to oblivion )" Kwag wrote this after me: "Hopefully we'll keep optimizing MPEG-1 to a point where we drive DivX nuts" but no problems! :) Yes dear friend,"we are both in agreement." :) don't need appology,but you "scare me" 8O |
Hey Kwag and SansGrip,
You've got to try "avsCompare" :D It allows you to load up to 4 avs scripts and allows you to switch between. You can enlarge the frame and save it as bitmap file. You can play each script to preview. There future enhancements to add subtitles to a bitmap image, but it can be done in the script now. I compared Temporal Smoother to FluxSmooth to TemporalSoften in 3 different scripts. Then I compared different Blockbuster noise variance settings with 4 different scripts. Then I compared BilinearResize to LanczosResize to BicubicResize. :) LanczosResize was sharper than BilinearResize which I already knew, but it was very clear when I enlarge them both. This is a great tool :D -black prince |
@black prince
where can you get it? i wanty i wanty! :) |
@SansGrip,
"avscompare" showed that LanczosResize not only sharpened the picture, but also enhanced colors. Colors were richer and image detail was clearer. My question... would this be suitable for CQ encodes. :?: I realize file size will increase, but since I'm not using Blockbuster noise and this would really enhance picture quality. BilinearResize appears to have a more softer look, but probably increases less. I plan to use 704x480 with CQ for 2 CD's. -black prince |
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In that post I suggested that one should always use Lanczos for its most accurate colour fidelity, and then soften if necessary with a filter designed to do this. Quote:
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