issues with frame ratio in 16:9 anamorphic

J

jackaoa

New member
hello all, i am new to the DVX pipeline & i can't figure out what is causing the problem below. any pointers? thanks, jack
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the DP shot everything on the DVX100a: 30p Advanced, progressive, squeeze mode

these settings were used in FCP to log and capture:
720x480 NTSC DV (3:2)
pixel aspect: Square with Anamorphic 16:9 checked
field dominance lower

My two problems are:
1. the footage occasionally has horizontal black lines breaking up the image, especially on movement.
2. the canvas has two vertical black bands on left and right of frame. (so the
image isn't filling up the entire 16:9 ratio -but the image isn't so small as to
be 4:3 either)
 
#1 sounds like an FCP playback issue. To verify, output back to tape or DVD and check.

#2 Did you have a matte box or attached or some other device? Do the bars appear only in wide shots or do they remain constant? Once again, I'd output to DVD and verify.
 
hey owen,

we didn't use any attachments during the shoot.
i exported clips and the framing bars are carried with them.
 
I think the problem is your pixel aspect. You said you are using square pixels. DV does not use square pixels. 4x3 uses a pixel aspect of .9, and 16x9 has an aspect of 1.2
 
these settings were used in FCP to log and capture:
720x480 NTSC DV (3:2)
pixel aspect: Square with Anamorphic 16:9 checked
field dominance lower
I dont use FCP but:

My two problems are:
1. the footage occasionally has horizontal black lines breaking up the image, especially on movement.

On premiere for 30p I select - no fields-progressive. Thats what would cause your black interlacing.

2. the canvas has two vertical black bands on left and right of frame. (so the
image isn't filling up the entire 16:9 ratio -but the image isn't so small as to
be 4:3 either)

As someone else said dont use square pixels. On premiere I interpret footage a2 16:9 not as anamorphic. Anamorphic in cinema terms relates to a different aspect ratio. Thus why you have bars.
 
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