HD res 1440 or 1920

[haris]

on my HPX171 (PAL ver) I set to 1080i and I get images (aprox) 1440x1080 instead of 1920x1080, same , when I select 720p I get (aprox) 990x720 instead of 1280x720.

why is that?

 

[Barry_Green]

That's how the DVCPRO-HD codec stores the footage. Up until recently, all HD codecs worked pretty much that way.

 

[haris]

fair enough, but since I have almost 500 pixels "less" (1440 < 1920) while recording on the 1080i res, dose that mean that my footage is of a different aspect ratio than what 1920x1080 usually has?

 

[Phenixone]

Yes

 

[Barry_Green]

The pixel aspect ratio is 1.3333 in DVCPRO-HD, yes.

 

[Jim Carswell]

It's a different aspect ratio until you bring it into an editing program like Final Cut. Once you bring into FCS, the software adjusts the aspect ratio to 1920 x 1080 and 1280 x 720.

I assume the other editing options work the same way.

Jim

 

[Cranky]

fair enough, but since I have almost 500 pixels "less" (1440 < 1920) while recording on the 1080i res, dose that mean that my footage is of a different aspect ratio than what 1920x1080 usually has?

HD frame aspect ratio is always 16:9. Pixel aspect ratio can be different though. For standard broadcast 720p and 1080i/p pixel aspect ratio is 1, that is, pixels are square.

By the way, DV 4:3 and DV 16:9 are both 720x480 (or 720x576 for 50Hz systems).

 

[haris]

.....until you bring it into an editing program like Final Cut. Once you bring into FCS, the software adjusts the aspect ratio to 1920 x 1080 and 1280 x 720.I assume the other editing options work the same way...

yes indeed, happens as well with edius5

thank you all for the feedback