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Official Low GOP topic, series 4
  • 586 Replies sorted by
  • mozesmozes

    @Alex thx for the tip about the i frame only patch. i am searching for a patch for some slow-motion adventure.

  • AlexAlex

    +∞

    This should not be a battle for the one and only approach. I need GOP1 and GOP3!

    If I am shooting footage that are expected to hold up well in some kind of vfx production pipe, my GH2 is charged with Driftwoods latest and grates i frame only patch. If you have to do what so ever 3D-tracking, slow motion, time reversing, heavy grading, P and B should better go to hell. I want to flood my fast Sandisk only with I frames! I did not had the budget for a RED so GH2 + VK + driftwood gets me close.

    If I have to keep the camera rolling in order to not miss the decisive moment or in order to get every bit of an important event, I go for a great GOP3 patch. Quality is very very good, it records to my Lexar 128 GB SD card, and spans without problems. Beautiful!

  • AlexauwaAlexauwa

    @artiswar Video looks great. Is that like Quantum 100? Where can I try download this settings? Thanks, Alex

  • sohussohus

    WTF just happened? I think it is OK that multiple routes are being tried out right now. The Quantum patches are simply the best if you go for 24H highest quality. No discussion. That direction SHOULD NOT be stopped.

    IMO, the paths we should pursue are: HIGHEST QUALITY = HIGH BITRATE HIGHEST QUALITY +/- = EFFICIENT BITRATE ALL-ROUND STABILITY (improve upon the PANA firmware without sacrifices)

    @driftwood what's up mate?

  • BraamokievBraamokiev

    +10, a big "Thank You, Nick!"

  • PixCanFlyPixCanFly

    I'm not complaining, the more the merrier. Other camera brands don't even have a single patch:) Over here, we have a patch for everyone. Isn't it great?

  • nomadnomad

    +1, a big "Thank You, Nick!"

    Why do you think I posted the Quantum patched GH2 next to the Scarlet? If you want to get more quality out of the GH2, go that route!

    If you want to skimp on cards, go the Panny route. The consortium crippled AVCHD to such low bitrates not (only?) because they want to protect their more expensive products. They also did it so it works with any shitty card out there and the average buyer won't cry for mummy.

  • cosimo_bullocosimo_bullo

    Nick, you have changed everything with your patches. Those of us who have the cards, disk space, and desire for the best looking image sing your praises daily... problem is, we're out shooting, not sitting on this board peeping. Thank you for all you've done, keep it up if you can. I for one can't thank you enough, truly, for the breakthroughs you've made.

  • troyjasontroyjason

    GOP1 forever. Memory card prices are falling. I think Nick understands. Everyone else...not so sure if they see the future.

    RJH your Bladerunner tribute was fun. Cheers!

  • chauncychauncy

    @driftwood

    Nick, what's going on?

    There a few self-entitled bastards at these forums who seem to think you and vk have to work to give them exactly what they want, as if they paid for it or something.

    But most are just excited and wanting the next thing. Your patches have given you a degree of fame and that has a weight- I know.

    Mostly there's just mad love for you.

    And now... concern. Since we don't know what has just gone down.

  • Zaven13Zaven13

    In light of the recent comments specially the one made by @driftwood, I wanted to point out a few things. 1. If the last few months have proven anything is the fact that technology is becoming complex and as new versions of the hardware and software gets introduced, it gets even more complex. 2. To achieve great results in short period of time, we all need to work as a team. Dozens of people have been contributing in these forums to make GH2 a better product. This team has its generals and subject matter experts like Vitalie, driftwood, lpowell, cbrandon and others. Then there are general users like me who try to contribute in testing and donations. It has been proven that multiple minds put together can produce better results than a single one. @driftwood Nick, there is no question that you have made tremendous breakthroughs with your intra GOP1 24p patches. Currently, it is the defacto standard for high quality 24p recording and I am a user of it. However, the results with 1080i and 720p along with cheaper SD cards and spanning have been less than desirable. There is a lot more work to be done to improve those areas. Lpowell, Sage, Balazer and others have been trying to help out and pick up the slack by doing research to complement your efforts in improving those areas. I think you should welcome their help and encourage them to ontinue their efforts. You have other things to do and you can't dedicate your life to GH2. You may be surprised that the research and theories that are provided by the others may trigger something in your mind that could make a big difference in your patches. 3. Finally, others may introduce their own patches based on their research and testing and post multiple pages to describe them. But at the end of the day "The proof is in the pudding". All of the introduced patches get to be tested by people in this forum who happen to know what they are doing and they are no dummies. So if a patch produces good results, it gets the praise it deserves, otherwise it receives the honest constructive criticism that it deserves. Let's share the spotlight and encourage and help each to achieve better results. After all, actions speak better than words. @driftwood, I hope you will avoid using negative comments and calling names in the future and work as part of the team. I would hate to see the good image you have created to be tarnished with these unnecessary negative comments. Cheers, mate.

  • L1N3ARXL1N3ARX

    ... what just happened...?

  • driftwooddriftwood

    Listen up motherfuckers, if you want shit, then record with shit, if Ive wasted 3 months of my life trying to find fuckin A pictures out of this camera, then fuckit, tell me youre a better man than I... nuff said. Right? Stay with the plan.

  • LPowellLPowell

    @duartix - "...if B-Frames are so much complex and they explore very particular cases of footage, how come they are so "efficient"?"

    As you suspect, much of the compression efficiency of B-frames has been achieved by using coarser quantizer tables than the tables used in I-frames. The justification for that is that the low-level residual data encoded by B-frames doesn't need to be encoded with as much precision as intra macroblock data.

    The flaw in that theory is what happens when the encoder fails to find suitable motion vectors for a sizable number of macroblocks in a B-frame. It is then forced to encode those macroblocks in intra-mode using the B-frame's coarse quantizer tables. For a consumer AVCHD encoder, this sacrifice of image quality for the sake of maintaining compression efficiency is evidently considered to be an acceptable tradeoff.

    Fortunately, Vitaliy has provided patches in the current PTool v3.63d that allow the firmware's built-in quantizer tables to be reassigned among the I, P, and B-frames used in the various video modes. I took advantage of this feature in my 100Mbps Flow Motion Patch to boost the quantizer table quality of P and B-frames to precision levels comparable to that of I-frames. Upcoming versions of PTool will allow me to craft fully customized quantizer tables that fine-tune the core encoding engine for optimal motion picture quality in each video mode.

  • LPowellLPowell

    @kodakmoment - "What's the use of peaceful coexistence of 24p and 50i modes? My assumption would be that anyone shooting a project in 24p (and hopefully soon 25p) would not need a good 50i mode..."

    If you have no personal use for FSH interlaced modes, then of course you may choose to sacrifice those modes in favor of tweaking the most our of 24p modes. For the 100Mbps Flow Motion Patch, my goal was to achieve optimal short-GOP performance without sacrificing any of the camera's modes or features. This makes the patch suitable for the widest possible range of interests and safe for use by novices as well as experts.

  • artiswarartiswar

    @mozes - Thanks! Little tribute to "Drive" I suppose. Quality soundtrack, that movie has.

  • mozesmozes

    Just used Quantum 9b in sunny daylight, fails on all (high)settings when shutter go's up 1/400.
    Iso was set on 160.
    i didn't see that coming a was very surprised, all my test before just where without any problem
    I did use the natural color preset, and manual white balances...

    @artiswar wow, that looks good, and nice music by the way....

  • balazerbalazer

    @sebben, I tested Cake against Quantum 100, and they are very very close in quality. Cake bit rates average less than half of Quantum 100's.

    I have started a new topic to discuss constant quality VBR approaches: http://www.personal-view.com/talks/discussion/2123/gh2-constant-quality-variable-bit-rate-encoder-settings

  • artiswarartiswar

    Quick test of Quantum 9b after leaving cinema class at university. Shot by myself on a tripod, pulling over every few miles and repositioning.

    Shot on a 28mm/f2 Lomo, Sandisk 95/64GB card, and a cheapo Davidson and Stanford Tripod. Graded only with ColorGHears. About a 15 minute edit/grade process.

    Astonished at the quality. The night shots where around 1600-3200 ISO and the grain is there, but completely bearable.

  • mozesmozes

    i agree with @rikyxxx when 50i converted to 50p you get a incredible clean and smooth image.
    i use virtualdub with the bob doubler plugin for that,
    i wish there was a workaround for it in sony vegas pro, there is, but not so good as with Vdub.

  • rikyxxxrikyxxx

    @kodakmoment

    Are you asking me why I don't use 1080p24 instead of 1080i50?

    Because with the right de-interlacing method (For instance BOB, Temporal & Spatial) I can get a quite good 1080p50 that means very smooth SloMo when slowed down.

  • spacewigspacewig

    @jefelemur Really enjoyed it... hold on to that actor for future projects - apart from talent there's something very likable and compelling about him.

  • kodakmomentkodakmoment

    @rikyxxx

    But why would you need a high quality 50i mode for that if you are loosing a lot of detail to de-interlacing in the first place? And what's the proper way to de-inderlace for you?

  • rikyxxxrikyxxx

    @kodakmoment

    I'm one of the dudes using (properly) de-interlaced 1080i50 for SloMo and I can guarantee you that 720p50 hasn't got the same level of details :-)

  • RJHRJH

    @driftwood Cheers mate! Thanks for your excellent patch, I'm looking forward to playing with Quantum on the next project.

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