Can't capture fluent video with bt878 card (Osprey 210)

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Hi, everyone

I found a problem with bt878 card under Linux(2.6 ~ 3.x) by v4l2
interface when I got a raw frame, but it looks like combined with
wrong field order. In other words, I will received Top Bottom Top
Bottom... fields sequences in theory. But now I got random sequence.

My test hardware blew:
HW:
 Xeon 5606, 4G, Asus Z8ND6C
Core i7 980, 4G, Asus P6T

Capture Card:
Osprey 210

OS:
Ubuntu 10.04
Ubuntu 11.10

SW:
VLC 1.0.6 & 1.1.12

Please give me some advice?

PS.
     In attach, that's a video snapshot.
     English not mine mother tongue, sorry my poor English.

Attachment: v4l2_invalid_interlaced.jpg
Description: JPEG image


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