Progresive does look better!

A

Adventsam

Well-known member
Just noticed how much less "posterizing" there is too on native 25p! No matter what settings I tried on flat black surfaces it seemed very noticeable in the wrapper, but in native all but gone IMO, cool.

On the downside RS at long focal lengths is worse:undecided but the footage has a real "solid" feel to it, smoooooooooooooooooooooooooth and crisp with the best colour rendition I have ever seen from this camera in video. If these setting hold up in detailed scen I'll be very happy.
 
so you are saying that pulled down/deinterlaced footage doesn't look as good as native footage? We need to see side-by-side comparisons please.
 
That was also what you were looking for, and could have been a lot of other factors. Not saying it was, but pulldown is a pretty seamless process. The only thing I can think of is that some processing power might be freed up by not encoding 60i, but it seems like that wouldn't matter until you raise the bitrate.
 
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Native always looks better. When deinterlacing you automatically lose about 20% of your vertical resolution (I believe that's the amount).
 
Ian-T said:
Native always looks better. When deinterlacing you automatically lose about 20% of your vertical resolution (I believe that's the amount).
Click to expand...


Ian,

Not 20%- that's the difference between true 720P and 1080P. Top quality pulldown does not induce a vertical res loss of even 2%... Other factors like compression over 60 fields vs 24 discrete frames and color are more affected by the 24/60i apporach from what I have come to understand.

Barry Green can set this straight the best though... Barry can you comment on this.


Pappas
 
deinterlacing and pulldown are 2 different things. The signal is native 25p in a 50i container for the GH1. It requires pulldown.
Deinterlacing is used to convert a native 50i signal to 25p and that causes loss of resolution.
The only reason there is a difference between the 25p in 50i vs 50i is due to compression. 25p requires only 25 frames to be compressed while 50i needs 50 fields to be compressed.
 
Quick update:

Quick update:

Looked at the 25p settings at low level from Zhaoyun and they had p spikes. In high detailed corn field and some slight panning the image went a bit mad, didnt freeze on class 10 and spiked well over 63mbit. But the image seemed to have lots of artifacts like it couldnt keep up. Then on the grass test-freeze, file corrupted and battery out to reset camera. What with p spikes and the artifacts and easy freeze on grass, have gone back to wrapper and ptool 3.6. 50-52-60 I think I'm on. I had a freeze at the weekend on the wrapper settings when I was at a concert and I was zooming out in IA mode(It was random thing, doh) and all the children were waving small flags, the camera froze but file wasnt corrupted! So for now am back with 25 in wrapper. Honestly these settings havent let me down, apart from this one time, which was possibly partly my fault, set shutter ie 1/50 and iso have never frozen on me regardless of scene/lens/zooming.
 
PappasArts said:
Ian,

Not 20%- that's the difference between true 720P and 1080P. Top quality pulldown does not induce a vertical res loss of even 2%... Other factors like compression over 60 fields vs 24 discrete frames and color are more affected by the 24/60i apporach from what I have come to understand.
Pappas
Click to expand...
Pappas yes I believe you are right. Also zcream hit it on the nail. I was thinking 60i deinterlaced and not thinking 24/60i which removing pulldown would look much better than a standard 60i stream deinterlaced.
 
There are 2 kinds of 24p in 60i telecine, and it's not just color that is adverse affected. Video compression is adversely affected in 1 form, but not the other

24p in 60i is encoded as interlaced i.e. it's hard telecine . This means you have interlaced chroma issues, and interlaced encoding inefficiencies (things like motion prediction and vector prediction cannot traverse fields, and many compression schemes only work on frames, not fields).

You can have 24p in 60i that's encoded as progressive, but uses "pulldown flags" - that's what progressive DVD's use , and it doesn't have the chroma or encoding weaknesses. This is "soft telecine", but the GH1 nor any hardware model does this.

Native progressive (everything else the same) will always be better than a hard telecine solution
 
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