GH2 GH2 1080-50i 50P - WHAT?

J

Jordan Cadby

Active member
Word.

a few questions for anybody who has a little time to clear things up for me.

The GH2 camera outputs a an interlaced file (when recording in that mode) which i understood as being a progressive file that is saved out in an interlaced wrapper, with fields that are the same.

is this the case? If so. then why do panasonic say there sensor is actually a 50P signal, surely its still just 25p? (Mine is a PAL model)

Also i was reading somewhere that when a NTSC model outputs a 60i file, its actually a 24p with a pulldown... if this is true, which i kinda think it probally isnt.

anyways if it is true how does it achieve a 50i file? as i dont think that method of working would translate to pal?

cheers

JC
 
Also!

I always here about people de-interlacing there stuff!

Surely you shouldnt do that! You should just set up an AfterFX project (or any other package) that outputs progressive from an interlaced file?
 
50i (and 60i on the NTSC model) are true interlaced discrete fields, until you drop below 1/50 (1/60) shutter speed.

There are a multitude of workflows to deinterlace - use whatever You feel gives the best result.
 
Hey Graham

Sorry i was refering to people dropping a field... instead of deinterlacing...

So to clarify the 50i footage has 2 different fields of information per-frame, and not just a progressive frame split into fields?

I thought that panasonic just a progressive file in an interlaced-file format because it was the most likely edit format not because it was actually interlaced
 
Jordan Cadby said:
I thought that panasonic just a progressive file in an interlaced-file format because it was the most likely edit format not because it was actually interlaced
Click to expand...
That is the case with 1080p on the PAL GH1. Its interlaced 25psf video is a 50i stream with each pair of fields sampled at 25fps.

The GH2's 50i video stream is sampled at 50fps. Each field contains only 540 even or odd scanlines extracted from the 1920x1080 sensor scan.
 
This deinterlacing confuses me,i drop my files 50i when they are 50i and edit the films then render to Blu ray / avchd discs or file for vimeo use if required,is my software doing any deinterlacing or is it staying plain 50i.
 
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