DVB field order

Since I've been producing some DVD's recently I've had to focus on making
sure the field order was correct in order to avoid that aweful jerky video
you get if it's wrong. Well I've noticed similer effects lately on DVB SKY
broadcasts, and they may well have been there before without me noticing.

Could it be really be the broadcaster can get field order wrong during
production?
Or could if be that DVD players produce smoother video when the field order
is correct compared to STB's?

Since I've been producing some DVD's recently I've had to focus on making
sure the field order was correct in order to avoid that aweful jerky video
you get if it's wrong. Well I've noticed similer effects lately on DVB SKY
broadcasts, and they may well have been there before without me noticing.

Could it be really be the broadcaster can get field order wrong during
production?
Or could if be that DVD players produce smoother video when the field
order is correct compared to STB's?

ISTR from my editing that it's usually lower field first (certainly when
doing out with DV sources in Premiere).

DVD and STB's should both be a standard MPEG2 stream, so can't see why their
output should differ.

"Mat Overton" wrote in message
. uk...
Since I've been producing some DVD's recently I've had to focus on making
sure the field order was correct in order to avoid that aweful jerky
video you get if it's wrong. Well I've noticed similer effects lately on
DVB SKY broadcasts, and they may well have been there before without me
noticing.

Could it be really be the broadcaster can get field order wrong during
production?
Or could if be that DVD players produce smoother video when the field
order is correct compared to STB's?

ISTR from my editing that it's usually lower field first (certainly when
doing out with DV sources in Premiere).

DVD and STB's should both be a standard MPEG2 stream, so can't see why
their output should differ.


The fact it's only one progran would indicate the problem is not at the STB
end, but a problem in production or broadcast.

I have used video editors which have got the field order wrong.

Mat Overton wrote:
: ISTR from my editing that it's usually lower field first (certainly when
: doing out with DV sources in Premiere).

DV field order is different from 'ordinary' 625-line video.
ISTR that DV defines the active picture as starting on line
335 rather than line 23 as would be conventional. I think
this is to make DV field order the same for PAL and NTSC:

DV (525 or 625): lower field first
'Ordinary' 525: lower field first
'Ordinary' 625: upper field first

Richard
http://www.rtrussell.co.uk/
To reply by email change 'news' to my forename.

wrote in message
...
Mat Overton wrote:
: ISTR from my editing that it's usually lower field first (certainly when
: doing out with DV sources in Premiere).

DV field order is different from 'ordinary' 625-line video.
ISTR that DV defines the active picture as starting on line
335 rather than line 23 as would be conventional. I think
this is to make DV field order the same for PAL and NTSC:

DV (525 or 625): lower field first
'Ordinary' 525: lower field first
'Ordinary' 625: upper field first

Richard
http://www.rtrussell.co.uk/
To reply by email change 'news' to my forename.

I can't recall which editor I used which got it wrong, but perhaps it was
designed for NTSC 525 line, and they forget to change the field order for
PAL 625.

In article ,
wrote:
Mat Overton wrote:
: ISTR from my editing that it's usually lower field first (certainly when
: doing out with DV sources in Premiere).

DV field order is different from 'ordinary' 625-line video.
ISTR that DV defines the active picture as starting on line
335 rather than line 23 as would be conventional. I think
this is to make DV field order the same for PAL and NTSC:

DV (525 or 625): lower field first
'Ordinary' 525: lower field first
'Ordinary' 625: upper field first

Richard
http://www.rtrussell.co.uk/
To reply by email change 'news' to my forename.

Phil: Made a worse problem, I believe, because if a DOMESTIC Sony DV
camera was used; the field pairing of the DV frame is RANDOM - and this
shows also if tryingto slo-mo the sequence in an editor.
(WHat Video Magazine reported on this many years ago)

--
Phil Spiegelhalter:
==== Technical Training for Broadcasters =====
*RE CUE Mobile DV Multi-Camera Production and Non-Linear Editing*