PTool 3.61d topic

mpgxsvcd

@chrimsbroome

What stops the GH2 from being used as a broadcast camera straight out of the box? Well unless you are in PAL land and they require 1080p @ 25 FPS. It won't do that natively......yet.

mpgxsvcd

@Tomaso

The issue is when the initial I and P frames stay low for several to many frames. If it starts low but very quickly jumps up then there is no noticeable quality loss.

Here is an example of a poor start to a video. This kind of bit rate will result in a macro block intensive first second. Examples like this should be avoided. That is why stream parser is so important in testing. Thanks Chris.

chrimsbroome

keep it up chaps soon we will have a broadcast camera that is not as expensive as the real deal :p

alcomposer

@_gl

Completely agree regarding 4:2:2- this is really something that keeps on coming up :-(
VK has done an AMAZING super human job- but I think that AVCHD can only be taken so far, (albeit very far)...
I think that internal recording is great- and should be increased in quality- but for utilizing this camera for dare I say it: "production" - external recording is a must- with the internal recording acting as a very good 'backup'- or 'fallback'. I am however- not interested in asking for the impossible coffee machine! (AVCHD + 422 not never going to happen!)

Great work guys! - and VK... Can't wait to start testing this baby!

Tomaso

Well i looked at some 24PH files from my still unhacked GH2 and you will find the first I-frame with size half of the rest and low bitrate in the very beginning 3-12 frames up to second i-frame.

APXmusic

@mpgxsvcd That's good to know! So Class 6 should be the bare minimum then.

APXmusic

@Angry_C That's true. What I should have said was "I have 16GB Transcend Class 10 cards and have had no problems with it at all while shooting in 24p"

But if you're going to be a dick about it...

cbrandin

I still see a low bitrate at the beginning (as was true with the GH13 as well), it's just not as extreme.

Aside from the initial blip, what's the highest bitrate you've been able to use with no crashes under any circumstances?

mpgxsvcd

I used 32000000. If you use over that value then it will cause the low bit rate GOP at the beginning. However, It appears that it can spike above the 32000000 value. I have seen as high as 34966520 for an average bit rate, but no higher.

cbrandin

Am I correct in assuming that you used a setting of 35000000 and not 42000000 for bitrates?

mpgxsvcd

@Angry_C

I will try the higher F-stop in a few minutes. That could cause it. However, these were 32-35 mb/sec average bit rate files so the codec won't allow the bit rate to go any higher.

Angry_C

@mpgxsvcd:

there´s much unsharpness in your screenshots, that decrease the detail level.
Use f-stop 11 with the pancake and it would crash in FSH (1080i) mode I think.
Or record grass on the ground with exact focus.

mpgxsvcd

@Sage

Both of those are high bit rate. I can't post the other large files from here. I am quite happy with the settings so far. Basically my cameras operates exactly as it did when I bought it except for the 30%-50% bit rate increase for all codecs. I think it is time to donate again to say thank you to Vitaliy.

Sage

@mpgxsvcd
Are they low bitrate 720p, and high bitrate 720p images?
The material is fantastic. I'm very happy w/ the motion in 1080p.

mpgxsvcd

@arvidtp

Can you post your settings file so we can double check it. In addition, does it produce any file at all for the failed videos? If so can you post the stream parser screen shot for those files so we can see what is happening?

mpgxsvcd

@APXmusic

I have tested every format the camera offers with the most detailed scenes I could fine. It hasn't errored once even with my Class 6 Eye-Fi card. The Patriot LX series and the Eye-Fi cards are known as some of the slowest in the business. I have one of each.

I would try using the settings I posted without any modifications at all. I posted them because that is what I used for all my tests and it has worked perfectly even with cards that barely meet the stock specs.

Angry_C

@Mimirsan:

can you post a screenshot of your testclip?

Angry_C

@APXmusic:

Your clarification was:

"I have 16GB Transcend Class 10 cards and have had no problems with it at all"

arvidtp

Here are two examples of what I'm shooting that causes my 720p60 shots to fail with a "card too slow" error. BTW I am shooting these handheld so that the screen pattern is moving around, as a worst case scenario. Will have to try steady with a tripod.

APXmusic

@Angry_C I shot at 24p. I guess I should have clarified that!

Angry_C

@APXmusic

and what`s about 1080i? No Problems on very high detailed scenes? Please test a full screen grass shot.
Maybe your scene was not intense enough?

Mimirsan

Shooting section of back garden (that always locked up my GH1 25p native) with recommended 42mb settings in ptool.
24h no fail at all including tripod lockdown...looks stunning.
1080i speed error
720p 50 speed error

Transcend 16gb class 10
Verbatim 16gb class 10

Will try out the 32mb settings...
EDIT
No crashes at all with 32mb settings ;-)

Angry_C

imho it has nothing to do with the card, otherwise they would be processed in a different mode not 50 mbit.

I tested sandisk extreme pro 45 mb/s and transcend class 10. In 24H and SH everything works fine, but in FSH I got the card speed error at fullscreen grass recording after 2 seconds, also at 18 mbit!

We should not look for the error in the cards, every class 10 Card shouldn´t have any problems with these seetings.

We have to play with the buffer settings.

APXmusic

@arvidtp I have 16GB Transcend Class 10 cards and have had no problems with it at all. I think you might have a bad card. There are those shit frames in the beginning, but I think everyone is having that problem at the moment. If you look back a bit I posted a very intense scene that I filmed involving a plasma plate. The AVG bitrate was pretty high.

bumkicho

@arvidtp
I would try the same settings with GOP mod.

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