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VK3API > DTV 08.03.08 09:00l 60 Lines 2480 Bytes #999 (0) @ WW
BID : 920457VK3API
Read: GUEST
Subj: TV Standards
Path: IZ3LSV<IW2OHX<I0TVL<ON0AR<VK6HGR<VK4TRS<VK3API
Sent: 080308/0217Z @:VK3API.#MEL.VIC.AUS.OC #:8446 [Lilydale] FBB7.00g
From: VK3API@VK3API.#MEL.VIC.AUS.OC
To : DTV@WW
Hi All
I noted the comments on Pal standards recently and it struck a rather sour
note with me.
As someone who has done a lot of video editing in an amateur capacity the
variations in standards are driving me insane.
Most tech people on packet would have come across the problem of handling
video and keeping the field dominance correct all the way through the
process from camerea to final product, (DVD in my case).
During a recent project I had to import several clips into the main video
all of which were taken on different cameras using different storage
mediums, for example hard disk cameras DV tape cameras and the product
came to me on DVD and tape. Most of the clips were not raw footage but had
passed through editting and burning software on the way.
There were quite a lot of flying sequences in the clips and these usually
included shots of aircraft wings moving rapidly. Now as youy would realise
aircraft wings having long straight edges moving fast are prime candidates
for aliasing.
Initially when I first had all the footage ready on my computer for
editing I found the "jaggies" were appearing in many of the clips and I
immediately thought to myself, AHA some people are using the upper field
dominant when they should be using the lower field.
This particular video is also my first excursion into 16:9 productiion and
rather niavely I had thought that it was simply a matter of the system
bunging on a few extra pixels at each side of the frame.
Well in amongst al the footage I discovered that some cameras were using a
standard 4:3 CCD to generate 16:9 by simply clipping the top and the
bottom of the frame whilst others did this by using a proper 16:9 CCD.
This meant that two cameras recording the same scene had two different
fields of view.
I also discovered that some PAL recordings were using square pixels and
some using other ratios like 1:7 and 1:04.
An internet search has in fact produced 14 different "Standard" PAL
signals along with a similar number of NTSC.
So what the hell is going on and what should I recommend to the group as a
PAL standard to set their systems to for performing edits. By the time you
add in the numerous HDTV standards it's a total shambles.
Regards Tony VK3API
73 - Tony, VK3API @ VK3FBD.#MEL.VIC.AUS.OC
Message timed: 12:12 on 2008-Mar-08
This message originated in Lilydale Melbourne Victoria Australia
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