720pN vs. 720p

S

Sean_M

New member
Hey guys, I am new to shooting on P2. I am aware that the Native setting saves room on the card when shooting 720. I'd like to know what situations you would specifically not want to shoot in Native. It must have drawbacks.

Thanks
 
Barry, by that do you mean that you cannot capture live to a computer via the firewire? Also, am I correct that Native records in the frame rate you are shooting live and non native records always in 60 frames?
 
Sean_M said:
Barry, by that do you mean that you cannot capture live to a computer via the firewire?
Click to expand...
Correct, there is no live streaming footage in the pN modes, but there is in the normal 720p modes.

Also, am I correct that Native records in the frame rate you are shooting live and non native records always in 60 frames?
Click to expand...
Correct. The non-native will embed its frames within a 60-frame sequence, adding padding frames as necessary (so 720/30p would actually be recorded as 720/60p with each frame duplicated once). Whereas with pN, it only records the distinct frames, avoiding duplicate frames, which is what gives it the 2 to 2.5 times space efficiency.

Frankly, if you're shooting to P2 cards, there's very little reason to use the 720p modes, the 720pN offers several advantages and only the one (non-streaming) drawback.
 
Question about importing 720PN into premiere CS4

Question about importing 720PN into premiere CS4

I just finished editing a project, and did not really notice that I had footage that looked odd (I thought it was an artifact of Premiere's playback) I noticed that when a subject moves across the frame, there is a blurry/double-image going on as if sequential frames are being blended together!

Upon outputting to a Quicktime, the problem became exaggerated and it is hard to see things clearly when they move!

I shot in 720PN 24P, and imported using the 720P DVCPROHD import preset in Premiere CS4.... what could be causing this? Thanks anyone!
 
There's no import preset. Do you mean the Sequence preset? If you were cutting in a straight DVCPRO HD sequence (60p), then you'll see it because Premiere will be interpolating the 23.976 to 59.94.
 
I just finished editing a project, and did not really notice that I had footage that looked odd (I thought it was an artifact of Premiere's playback) I noticed that when a subject moves across the frame, there is a blurry/double-image going on as if sequential frames are being blended together!
Click to expand...

that sounds a bit like the "24p cadence" and its a "feature" of shooting in 24p. it happens when someone tries to shoot in a film-cam setting the same way theyd shoot in a video-cam setting
 
Oh, okay, it says there's a sequence preset for 720PN footage (the one named above, I did mean sequence preset) so how do I fix this?

here is the text I copied from the setting I used....

General
Editing mode: P2 720p 60Hz DVCPROHD
Timebase: 23.976fps

Video Settings
Frame size: 960h 720v (1.3333)
Frame rate: 23.976 frames/second
Pixel Aspect Ratio: HD Anamorphic 1080 (1.333)
Fields: No Fields (Progressive Scan)

Audio Settings
Sample rate: 48000 samples/second

Default Sequence
Total video tracks: 3
Master track type: Stereo
Mono tracks: 4
 
You shouldn't see any ghosting on that sequence. You may see it in a render if you export to a different frame rate, particularly 30p.

You're certain it's 24pN footage?
 
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