HVX200 PAL : Real 1080 25P ?

This is no different from the DVX.

NTSC DVX100 records on tape only a 59,94i signal

and the PAL DVX100 can only record a 50i signal.

But the NTSC cam CCD can sample 23,97P 29,97P and 59,4i

and the PAL DVX CCD can sample 25P and 50i.
 
SPZ said:
I think I understand why there's a certain loss in resolution when you go to a 25 shutter in 25p recording (in 1080i).

Since 1080i 50 dvcpro hd is interlaced, it can only see 50 fields. The 25p of the HVX does progressive embeded on those 50 fields, right? So theoretically, if you go to 25 shutter speed, you are recording only half fields of the 50 i stream- so it means you are recording half the progressive HVX frames. Can this be correct?

I say this because I shot with the HVX at night and can clearly see a resolution loss when going below 50 shutter. Can anyone confirm this?

I think that's why Panasonic recommends the 50 shuter speed...
Click to expand...

Forgott to comment.

You loose resolution because slower shutter speed creates more motion blur. But it really isnt that you loose resolution its just the image gets blurry. But you have a very high resolution blurry image. ;)

The recommended 1/50 shutter speed is because thats the best way to imitate filmlook.
 
MovieSwede said:
This is no different from the DVX.

NTSC DVX100 records on tape only a 59,94i signal

and the PAL DVX100 can only record a 50i signal.

But the NTSC cam CCD can sample 23,97P 29,97P and 59,4i

and the PAL DVX CCD can sample 25P and 50i.
Click to expand...
That's also what I read. The DVX carries a 25P image through a 50i signal. Like the HVX. Same thing.
 
Well filmcameras normal shutterspeed is 1/48 and thats very close to 1/50.

I dont know how much you can push filmcameras shutter but there must be shutters so the film can run inside the cam.
 
Maybe just a silly question, but why does the HVX make 1080/25P through 1080/50i ?
To maintain 100Mbits ? Otherwise, how much would it take (in Mbits) ?
 
1080/50i is 100mbs and its a established standard so it very logical to place the 25p footage in that stream. Because there is no DVCPROHD 1080 25P only 50i.

The "PAL" version has lesser frames then its NTSC counterpart and therefor can store bigger imagefiles.

1440*1080 with chroma 720*1080
vs
1280*1080 with chroma 640*1080
 
Thanks MovieSwede.

Would 1080/25P use more than 100Mbits (if it wasn't carried through à 1080/50i signal) ?
 
So, Panasonic went out for the 1080/50i mode, as it's an established standard. A lot of edit suites can handle it. Is that the reason ?
I wonder way they didn't go for a "simple" 1080/25P as well, as they did with the 720/25P. Any idea ?
 
Well actually 25P in an established 50i signal is the easy way.

The 720 25P is another story. Because thats a progressive only codec. And its really 60P stream. But the stream allows variable framerates from the beginning (Varicam) So It store 24real frames and 36 fake frames (Im not 100% on this so dont quote me) But the fake frames takes no storage space.

On the Varicam its on tape so it has no other way then encode it in the full 100mbit stream. So this is one of the great things about P2.
 
I may be wrong, but I thing that 60 images are recorded, when you shoot in 720/60P.
The only way to save some storage, is to shoot in 720/24pN (native), were only 24 images are recorded.
 
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