Archived from groups: rec.video.desktop (
More info?)
reginald beckley wrote:
> I am baffled. The clip size of 352x576 is compressed spatially
> in the x direction and can be played on a DivX player expanded
> to a 4;3 aspect ratio to give a "normal" picture.
Likewise, a 352×240 clip (which you mentioned in one of your
earlier posts in relation to the "Honest Technology" encoder)
is not in a correct shape: it is elongated spatially in the
x direction if you view the clip with a video player (or some
other software tool, such as a video editor) which displays
the movie pixels with a 1:1 mapping to the screen pixels.
Note that the full "PAL" DVD resolution (720×576), too, is
somewhat compressed in the x direction if viewed using 1:1
mapping to the square pixels on the computer screen.
Most practical digital video formats are just like that; they
store the pictures in a format where the area represented by
each of the individual pixels is rectangular, not square.
> My objective is record the clip on a DVD after editing in
> Premier Pro but I am attempting to resize it to a nominal
> 4:3 frame.
352×576 _is_ a nominal 4:3 frame. 720×576, too, is a nominal
4:3 frame. 704×576 is a nominal 4:3 frame. 352×288 is also a
nominal 4:3 frame. The DVD standard supports all these
resolutions and it does not discriminate between them - none
of these resolutions is "the" nominal 4:3 DVD resolution.
To add to the confusion, all these resolutions can also be
used for 16:9 material just as well.
The shape of the picture is defined by how the MPEG-2 stream
is flagged - not by how many pixels there are in the vertical
and the horizontal direction - and the DVD player reads these
flags and acts accordingly.
* * *
Anyhow, Premiere Pro should support editing the clips directly
in their native resolution - 352×576 - or it does not deserve
the "Pro" addition to its name.
Even though PPro might not necessarily have a template for this
resolution, you should be able to create one yourself and key
in the pixel aspect ratio somewhere (which is 256/117 for the
352×576 format.) After having done that, the monitor window
should display previews in the correct aspect ratio.
* * *
There apperas to be a Pixel Aspect Ratio listbox in the Project
Settings:
<http://www.animemusicvideos.org/guides/avtechbeta/images/Ppro-
newprojectCustomGenera.gif>
I am not sure if Premiere Pro lets you define a custom Pixel
Aspect Ratio directly in that window, but at least the earlier
versions stored the PAR in the project template files, where
it could be manually edited.
* * *
It would be easier to offer more specific advice if it was known
whether you want to edit in pieces of some other video clips
(which are, perhaps, in some other resolution), and whether
the original 352×576 clip (or the other clips) would form the
bulk of the final, edited clip.
If you are going to use the 352×576 clip as a basis for all your
work (and if there is relatively little or no footage in other
any other resolution), then it would be reasonable to keep the
project in its native 352×576 resolution all the way, and burn
it to the DVD in that format. If, however, there are lots of
segments in some other resolution, the it would be more
reasonable to set the target format to that resolution.
Additionally, even if a conversion to another resolution is
absolutely required, DivX is not a good intermediate format.
There should usually be no need for conversions to intermediate
formats at all, and even if there is, DivX should be avoided.
* * *
Also note that if the project only involves simple cut-only
editing of the original file (with no transitions or other
additions), you could do it in a totally lossless way, using
some MPEG-2 oriented editor. For example, TMPGEnc contains a
simple built-in MPEG-2 clipping tool which can be used for
removing segments of video or for merging two clips together,
without touching the original picture content or recompressing
at all.
There are also more advanced MPEG-2 editors which can be used
for basic editing, and which try to retain as much of the video
in its original (non-recompressed) form as possible.
* * *
Finally, if everything else fails and you just want to resize
the video (no matter what!) try VirtualDubMod:
<http://virtualdubmod.sourceforge.net/>
Also see the web site of the original VirtualDub which will
give more pointers and hints as to how to use the program:
<http://www.virtualdub.org/>
--
znark
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