On Sun, 4 Jun 2006, E.Chalaron wrote:
> > And that's the type of problem you've had in the past as I recall.
>
> Well I had a problem by explicitely using the aspect ratio of 1:1 which I
> eventually removed for a value close enough to Ok for me.
I forget why you're not scaling to the size you'll want eventually.
It appears that you're going from 1280x960 to 1024x768 as an
intermediate stage, doing some processing, and then scaling
again at some point to PAL DVD frame size.
> Well 150 frames is already about 200 Mb, and a 400 ft reel of super 8 is
> coming to 65 Gb without even using any pulldown :-)
Small file <grins> - you should see some of mine ;)
Seagate just announced a 750GB drive ... Prices on the 500GB drives
are falling rapidly, at least here in the US.
> My biggest trouble is to get my USB or firewire to work properly under SUSE
> 10.0
That's a problem? I thought you'd resolved those issues a long time
ago
> Thanks, will keep people updated with this
Why, and if you mentioned it before I've forgotten, not scale to
the PAL DVD frame size? Much more manageable and it's what you want
eventually anyhow.
Your camera I recall your mentioning generates 1280x960 8bit 4:2:2
video range data. That's a 4:3 image exactly. But there's some
junk/cruft/sprocket-holes/whatever on the edges that you want to get
rid of. So, crop a 4:3 subset of the frame - I recall you'd mentioned
that about 40 pixels on each side was the correct amount. That leaves
1200 pixels - so to get a 4:3 image the active area becomes 1200x900
(4:3 exactly), need to crop 30 pixels from top and bottom.
This will do exactly and precisely the right thing:
... | y4mscaler -I active=1200x900+40+30 -O sar=59:54 -O size=704x576 -O
infer=exact | ...
Varying the crop parameters probably is necessary but that should be
a good starting point.
If you want the looser-scan 720x576 frame size feel free to change
the 704 to 720 - y4mscaler will pad by 8 pixels on each side to
accomodate your desire.
The smaller frame size should speed things up a lot and save a lot
of disk space too.
Good Luck,
Steven Schultz
_______________________________________________
Mjpeg-users mailing list
Mjpeg-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/mjpeg-users
