Surely GOP 1 defeats the whole design ethos of AVCHD, and renders it's clever-compression advantages redundant!

Edit : oops don't post when tired. Just realised this was a GH1 setting.

The problem with the old thread, it seems to be primarily GH2 focused. I remember reading in the early days of the GH2 hack, that the encoding was different and GH1 settings wouldn't work on the GH2. Do the same hacks and settings apply to the GH1? If not there definitely should be a GH1 specific low GOP topic.

This is the only other place I've found any info on low GOP settings: http://www.asterdesign.com/en/gh1-lumix-gh1-hack-settings

Thanks CRFilms thats a very comprehensive link on GH1 hacks. I feel there are some definate advantages to the lower gops in relation to motion and shadow detail. I think allot of the problems still come up with native 24p causing some issues and adding to a non stable patch. I hope some of you GH1 users can join in this quest to try and make it better.

@CRFilms - "Can we just change the GOP down or do other settings have to change as well on the max latitude patch?"

No, it's not that simple, the reliability of these GH1 high-bitrate patches is very sensitive to GOP-length and is rather challenging to test. I had to run statistical tests using multiple takes of codec-breaking scenes to determine which combination of settings was most resistant to failure across a range of stressful shooting conditions.

@ driftwood I see you have GOP 1 working with the GH2. I know the codecs are different animals and the GH2 does have more processing power, but it seems to be working somewhat in my tests. I think the crashs which ocur as usual on static high detail scenes might have to do with 24p being recorded as 23.971 not at 23.976 this has been a problem from day one. So many variables can fall into beyond the SD card controller not being up to snuff.

@ driftwood someonetimes these patches are as much fun as a fork in the eyeball. I have worked on over a thousnad variations of 24p since the GH1 hack came out. The GH2 ptool seems to have better for options and I'm using a 66mbit 3 gop version right now that looks pretty good. Were Just jumping back into some pick up scenes for a week on a project we did in June with 2 GH1's and a GH2. I will give your 1GOP a go on some scout shots and see how it goes. In the mean time my GH1's will handle the grunt of the action all be it at my current 6 gop 24p patch.

I have been having some good luck with this patch it gives you smooth cadence with pans and any fast moving scenes. It averages around 45 -65 Mbps on well lit and exterior high detail scenes.

For most of the scenes I have filmed, it was 97% stable and produced some of the best 24p highest quality I have ever seen coming out to the GH13 to date. I have found that If do get a card write error on high detailed scenes, it will still save the clip file and resume back to live view mode in a few seconds once the clip has been forced to stop recording. Unlike other patches that lock up the camera completely and require you to pull the battery and power it up again with the locked up clip being completely lost.

So far the best camera and lens scenario for this patch has been with non Lumix lenses. I have used several Canon FD lenses ranging from f1.8 - f22 with good ND filters with my tests. It is also advisable to shoot 1/3rd of a stop under exposed and to use a SanDisk Extreme Pro 30Mbps card to help safeguard you with the best possible write error protection.

@rigs ....The problem with the GOP1 patch is...over exposed it won't record, and it dies fast in low light. Didn't think that would be that big of a problem, but even a few seconds of pure black and it shuts down and locks up without saving. I tried the new one and same thing and I don't want to have to buy the top of the line card to record.

I adjusted Lpowells Max Latitude 100mb at GOP 15 to GOP6 and it went a lot better. I'll try that for a while now and see how that goes.

What about 720p? It's stable?

Thanks for your work, rigs.

Made some changes to the patch with better luck

PTool v3.62d (160811) settings

WRAPPER
Native 24p/25p checked

AVCHD COMPRESSION
Video Bitrate FHD/SH = 65000000
Video Bitrate H = not checked
Video Bitrate L = not checked
Overall Bitrate = not checked

AVCHD GOP LENGTH
720p60 GOP size = 1
1080p24 GOP size = 1

PATCHES FOR TESTERS
AVCHD MOVIE MODE

AVCHD COMPRESSION
Preset bitrate = 530
Preset bitrate 2 = 1060
Overall bitrate 2 = not checked

AVCHD Research
Video buffer = 25.000.000