NEW GH1 24p 110 MBs Gop 1 patch

I too have tested GOP-1 settings on the GH13 and would like to use them more. However, I wish there were also GOP-1 settings tuned for a bit better reliability also. I would be willing to give up a bit of the IQ for being able to shoot in daylight pretty reliably. I am studying the GH13 color noise problem so there is no time for me to study the AVCHD settings right now.
 
I installed these GOP-1 settings and they are "sick". I'm getting sick video in certain conditions, mostly indoors. FPN is pronounced, there is only one exposure where the levels match and FPN is minimized. Turning the exposure one notch to both directions makes FPN issue again.

Outdoors in sunshine and high contrast (small aperture) these settings mostly fail (Kingston Class-10). However, if focus is slightly off, they record. Even when they fail, there is still a viewable file.

Obviously these settings are very close to perfect. If there was a way to even slightly improve reliability outdoors, I would only use these. Anybody have any idea of the AVCHD and buffer settings?
 
How does this work in VERY low light? I tried one of Rigs earlier patches last year, but I found it unusable because if you started in a lighted scene then moved to a dark scene, the camera stopped after a couple of seconds. I'd heard Low GOP on the GH1 would cause write fails with low light, but the speed of how fast it failed was shocking.

If you tried to go into a tunnel, for instance, you wouldn't last 3 steps before the camera shut off. Has this improved low light and has this been tested with the super fast 95mb cards? Those cards didn't exist when the GH1 hacks started. I wonder how high you can push the hack with those.
 
I've yet to test in very low light, but using the acquired knowledge about fine tuning WB for cleaner images now allows me to film as high as ISO-1000, so I doubt the filming will cease for no image content. There will be little bit of noise in any case at ISO-800 and above. To my knowledge the bottleneck is not the card, but the camera only has two processors versus three for GH2, so it can not process data above 100 Mbit/s for longer than the buffering allows, a few seconds.

I will be testing more very soon.
 
Not low-light with high iso, but low light with low iso. I'm talking about a black, or near black image.

Before if you started recording and put your hand over the lens, it would shut down in a couple of seconds. Standard hacks would keep recording for 10 plus seconds. There's instances where you'd start in a properly lit scene, then walk through a dark hallway or room to get to another area. GOP1 will shut down in the dark areas.

Does this new GOP1 hack do the same? Would a faster card fix that or is that just a standard problem with low gop and the GH1?
 
I just did a quick test...it shuts down at low iso and no light. If you start recording at iso below 1600 and cover the lens, it shuts down within a couple of seconds....BUT, at ISO 1600-3200 (Max iso bug fixed on new Ptools!) it stays recording for 5+ seconds.....At ISO 3200 it stayed recording for almost 10 seconds when I put my hand over the lens.

Now I just need to test the max ISOs to see how they look.
 
Hi everyone,

i have been comparing the 100mbps max latitude patch and rigs latest patch. i see there preset bitrates for rigs is lower that the max latitude and so i changed rigs according to this. i know rigs is GOP1 and max latitude is GOP15 so the values work differently?
i have been using Rigs patch for indoors and outdoors and it work fine for me. im using a SanDisk Extreme Pro 95MB/s
i did change the preset Bitrate 1 and 2 to 90 instead of 60, the video buffer to 84 000 000 instead of 50 000 000, i left everything as it is and still works fine. i honestly dont know what effects this brings. VLC and Media info says max bitrate is 126mbs, the cosntat is from 16mbps to 50mbps depending on the scene. only once went up to 81mbps and i was filming myself against a mirror? (there was a lot of colours) no idea i dont really understand how this works but could anyone help me keep testing this settings
and maybe changing some settings to get the most out it? again my gh1 has never crashed but its probably because im using a SanDisk Extreme Pro 95MB/s which is probably the fastest SDHC card out there
it definitely feels like the GH1 can go a bit higher and still be as stable as Rigs latest patch. i have been doing this for 2 weeks now on my own, even though i have no idea if this is doing bad or good. im just going by the footage quality i get but its hard to judge...now everything just looks the same. im using a Nokton 25mm /F 0.95
anyone have any ideas ?
 
ps: i dont have any iso problems. maybe is because of the nokton f 0.95? i was filming last week with no lights and tried the low light tricks by setting my camera is shutter priority, putting my hand in front of the lens, select 3200 ISo then use the little nob to change the brightness things - right next to the shutter values?( looks like -3...0...+3 ) i dont know how to call it :) and bring it all the way to +3.
bottom line. i didnt need any lights and i was filming perfectly. obviously had lots of noise in some black part BUT! footage was useful according to my editor.
camera worked fine with Rigs patch and didnt have any bad effects or anything
 
Again...you need to test LOW ISO and NO LIGHT. The problem with high iso is, the image is so noisy, even with your hand over the lens, a bit of light creeps in and the resulting fpn/noise/grain pattern is enough for the camera to keep recording. Shooting in low iso in total blackness causes failure within 3 seconds.

Lpowell wrote this in his 3GOP hack:

Unfortunately, there is a reliability issue with using short GOP-lengths in the AVCHD encoder. Under extremely dim illumination, video bitrate can fall below 5Mbps. If this condition persists for longer than about seven seconds, the AVCHD encoder may terminate the recording, leaving a zero-length file. This malfunction can occur with any AVCHD patch that uses a reduced GOP-length, and the only known way to guard against it is to make sure your subject is adequately lit at all times.
Click to expand...


I run into this EVERY time I try low light, low iso, much faster than 7 seconds and the clip fails completely to record. If you're doing a tracking shot outdoors and you go indoors to a dimly lit or not lit passage or room then back outdoors...chances are the recording will fail before you get back into the light. And when it fails, you loose the entire shot.

I'm only using a standard Transcend class 10 that has about 14mbs write. I don't know how the 30mb, 45mb or 95mb Sandisk cards will hold, but as it stands I cannot use this hack in moody darkly lit scenes at standard ISOs.
 
Wow I'm getting bitrates triple that of the 100mbps patch, and have had 0 crashes, even in outdoors...

Edit: This thing is insane indoors, I can actually underexpose and it looks good! What about the 60p part? It doesn't really work for me. I am shooting wide landscapes outside and I still have not had a single crash. Am I doing something differently than the rest of you? The footage I am getting inside and out looks like gh2 footage. crazy!!
 
Last edited:
What memory card are you using? These settings mostly fail for me outdoors with high contrast scenes and/or small lens aperture. Card I have is Kingston Class-10.
 
I actually have 16gb PNY class 10. It's not rated very high, but I have hardly ever had a crash in all sorts of scenes. And I have used the 20mm pancake wide open in a landscape of my backyard. I have no idea why it is so reliable to me.
 
leckel1996 said:
I actually have 16gb PNY class 10. It's not rated very high, but I have hardly ever had a crash in all sorts of scenes. And I have used the 20mm pancake wide open in a landscape of my backyard. I have no idea why it is so reliable to me.
Click to expand...

I used VLC Media Player and from the menus selected Codec Information. There are four different bit rate numbers, the bottom one of them shows ~90000 kbits for about a second before the camera has stopped recording.

Could you check your material and if your card allows that number to rise to over 90000 kbits and continue to stay there? Then we would know if it's the card that is working better for you. The Minolta MD lenses I use are very sharp even at full aperture, so bit rate rises very rapidly for a brightly lit detailed scene. I only need to adjust focus slightly off and the camera records.
 
using aperture 5.6 on my 20mm pancake across my backyard I am only getting bitrates from 50mbps to 70mbps... Never went above 75mbps... Probably just my subject, the detail is incredible though.
 
leckel1996 said:
using aperture 5.6 on my 20mm pancake across my backyard I am only getting bitrates from 50mbps to 70mbps... Never went above 75mbps... Probably just my subject, the detail is incredible though.
Click to expand...

Thanks, I use Tokina AT-X zoom lens and Minolta MD lenses and am having a lot of trouble in daylight. It constantly goes to 95 mbits and then stops in a second. Needless to mention it's like watching Bond movie after CC. Probably the purple filter adds color information.
 
Aki_Hartikainen said:
Thanks, I use Tokina AT-X zoom lens and Minolta MD lenses and am having a lot of trouble in daylight. It constantly goes to 95 mbits and then stops in a second. Needless to mention it's like watching Bond movie after CC. Probably the purple filter adds color information.
Click to expand...
This hack and the purple filter makes the gh1 just sing.
Edit: I'm using a purple filter too...
 
Last edited:
Use this to test your card speed:

http://www.softpedia.com/get/System/System-Miscellaneous/H2testw.shtml

A standard card slot or usb port should only do around 20mb max, but if you can hit that 20mb you should be good for all but the highest bitrate hacks.

My PNY LX 16gb hits 9mb and ticked me off since that card was recommended...my Transcend 16gb hit 14mb. That was good for some low GOP1 hacks on the GH2, but it did fail on occasion even at low 130mb GOP1.

I'm going to buy some cards at Best Buy next paycheck since they have a 14 day return and test at least 3 Sandisks...a 30mb, a 45mb and the 95mb if they have it. I'll try and have a review of them after the weekend.

EDIT: Did a quick test and this bush would not record with either the 30mb, the 45mb nor the 95mb Sandisk card. I changed the GOP to 3 and it did record for a bit then fail, but depending on how close I was it would record for a bit while the GOP1 would fail instant even with a 8gb 95mbs Sandisk Extreme Pro. Also shot using a purple AND pink filter and image is CC'd back to normal.

Slider2.jpg
 
Last edited:
It plays back perfectly on camera Yaz. only problem, at least for me an others as I can see..., is that wen I go ourtoors the chance that the codec rises It´s bit rate above 75-80 Mb/s is very high and then stops recording or eve I got some files that where recorded but when played back on camera they where quite jerky with wite alot empty frames...
For some information about differnt cards, I use two models, both of them from SANDISK:

1- It,s a Sandisk Ultra II Class 4 16MB/s and 16MB of caoacity.
2- It,s a Sandisk Extreme III Class 10 30 MB/s and 16 MB of capacity.

Both of them performs almost the same for my GH13. Only thing I´ve noticed is that with the Extreme III version I can record for about a few seconds more
(maybe 2 - 4 secons) than with the Ultra II but only in certain conditions.

Hope this help and THANKS alot for all your effort in developing this VERY NICE PATCH!! especially to Rigs!!
As other have stated before, with this patch I manages to record STABE files of more than 75Mb/s witout problems while with the most of the different I tryed before
was not possible even 45 - 50 Mb/s! :)
Cheers!!
Asier.
 
I was wondering what the maximum constant bit rate is for GH13? Can it actually record 100 mbits constantly or only for a second or two? The limit is placed by the camera and not the card, but how high is the limit for GH13?

Please have a look at the VLC Media Player and menu Codec Information, there are four bit rate numbers. I have been checking the lowest number and for me the limit is about 90 mbits, the camera only records at that high bit rate for a second, but not sure if it is a limit by the camera or by the card. The video is perfect, so if it was possible to push this a bit further with another type of card, I would be set.
 
You must log in or register to reply here.
Back
Top