AVCHD: Stable settings

stoney

@cbrandin your case sounds familiar to me. When 720p60 footage gets slowed down a lot by Twixtor or Timewarp, sharp images are preferred. Yes higher shutter speed and stable shot. Usually those shots are on a fast moving subject. In this case what would be preferred AQ setting? Lower or higher?

cbrandin

@stonebat

Sounds good to me - go for it!

Chris

stoney

How about blending 1080p GOP6 & 720p GOP6?

1080p GOP6 has 4 I-frames each sec.

When 720p60 GOP6 conforms to 24p, each sec will have 4 I-frames.

cbrandin

@stonebat

It's because with handheld there is always, no matter how much you try to avoid it, some blurring. In my tests I have been able to use extreme settings that never fail if the camera is hand held. Put it on a tripod, set AFS (which prevents focus hunting, which also blurs), and a failure occurs virtually instantly if something is wrong. It's rather amazing...

@Butt

this sounds very good - nice job!

Chris

cbrandin

@Butt

I was thinking about something and I wanted your opinion. A common use for 720p is slow-motion. It seems to me that if you have gotten 720p with B frames stable, there might be an additional thing to try; that is, setting the 720p GOP to 12. My theory is that if B frames are used, and the GOP is set to 12, you end up with footage that would blend very well with 24H footage. Does this make sense to you?

Chris

stoney

AFS & fast shutter will stress the codec? Is it because of more focused details and more data required for B-frames?

Butt

Yes - i testet Shutter 1/100 in bright sunlight - the Bitrate is stable - no big dips in bitrate: very evenly
thank you

cbrandin

@Butt

nice... Have you tested these using a tripod and setting focus mode to AFS? Testing that on a highly detailed scene with a fast shutter will really stress the codec. How are the bitrates holding up - no big dips in bitrate?

Chris

Butt

Setting Original GOP CBrandin 1080p and @Butt 720p B-Frames (PTool 3.62D)

stoney

66Mbps/GOP6/AQ3 seems stable. Can it join in this Stable settings family? That might require Class10 card though.

TommiH

@danyyyel , Here is the original: http://hares.fi/orig.png Can't be sure about the ISO, but I think it was 160.

Braamokiev

Thanks

@danyyyel

danyyyel

@TommiH can you post the original before the levels in Ps so that we can judge. what Iso was it shot?

Thanks

danyyyel

You just download the link, it is the latest build. When you launch it you will say 3.62.

Braamokiev

@TommiH
Ok thanks where is the links for 3.62?

Regards

TommiH

@Braamokiev I used PTool 3.62

A frame grab of an underexposed (then set levels in PS) 24P video: http://hares.fi/videoframe.png with the settings, shot with the 14-42 kit lens. Quite happy with the results :)

Braamokiev

Hello,

@TommiH

With firmware 3.61d or 3.62?

TommiH · Screen Shot 2011-08-17 at 9.21.18 AM.png

44Mbit 6GOP 24P, 44Mbit 60P, Stable Settings for Slower Class 6 Cards
I use these with my EU version GH2 with Transcend 16 Gig Class 6 card, works great!

Dusty42

@jvalal

The setting that I posted was based on ptool 3.61d. The settings are basically from Swen24 with Tomaso's removal of 1080p24 High Top Setting and 1080p24 High Botton Setting. The settings are rock solid even on my Kingston 32gb class 6.

You might be using ptool 3.62d.

jvalal

@Dusty42 that config doesn't work on my g2..Doesn't allow me to shoot anything..

Tomaso

I have now tested Ptool3 3.62 with:
30 min removed
all High setting = 32 000
all Low settings = 26 000
Nothing else

All modes looks great on screen and in StreamParser.
I will use these settings (for 24H) for my shootings during the weekend.

Dusty42

@mpgxsvcd

Thanks for the clarification. Just went back to the manual and found the confirmation.

"Motion picture recorded continuously in [MOTION JPEG] is up to 2 GB. Only the maximum
recordable time for 2 GB is displayed on the screen."

mpgxsvcd

@Dusty42

That is correct MJPEG only shows the time limit for a single clip. AVC-HD shows the time limit for 1 or more clips. MJPEG has a limit for a single clip as well as a card capacity limit. The display only shows the single clip limit for MJPEG. AVC-HD does not have a single clip limit other than the card capacity limit and that is what is displayed on the screen.

Dusty42

@mpgxsvcd

Thanks for a quick response.

>MJPEG time limit is based solely on file size. If I remember correctly it is a 2 gigabyte limit.

Are you saying that time remaining for MJPEG mode only indicates time for a single MJPEG clip?

>The higher the bit rate for MJPEG the lower that time limit will show because it will reach the 2 gigabyte limit faster.

Should I not get a different time limit for 8gb, 16gb, and 32gb? But what I see for the time limit for all the cards is 8m20s. Did I mis-understand you on this?

mpgxsvcd

@Dusty42

MJPEG time limit is based solely on file size. If I remember correctly it is a 2 gigabyte limit. The higher the bit rate for MJPEG the lower that time limit will show because it will reach the 2 gigabyte limit faster.

For AVC-HD it just depends on the capacity of the card and the bit rate. I doubt those Top and Bottom settings have any affect on MJPEG.

Let's let VK concentrate on what he is working on. If he gets this done then everyone will see great benefit.

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