Organization: Kabel-TV over Internettet <http://www.streamtv.dk/>
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030624
Hi
Dave wrote:
> Note that although your source is 720x576, you'll want to scale your
> output to 640x480 (or perhaps 720x540), because those are 4:3 aspect
> ratios. Remember, computers generally use square pixels, but broadcast
> standards such as PAL and NTSC use non-square (rectangul-shaped) pixels.
Scaling from 576 lines to 480 lines is a big NO-NO due to interlacing if you
want to maintain video quality across the stream. If you don't care, the
feel free toscale as you like.
Nearly all modern players supporting MPEG-4 implements PAR (Pixel Aspect Ratio).
The one exception is the Quicktime player - at least on the Windows platform.
PAR is part of baseline MPEG-4 and since Apple has not implemented PAR (on the
Windows Platform), it is false by Apple to claim that Quicktime 6.5.2 support
MPEG-4 Visual Simple Profile.
Envivios latest plugin (supports H.264) for Quicktime (and mediaplayer and realplayer)
now implements PAR correctly.
I think (but I'm not sure) that PAR for MPEG-4 is partly implemented for Quicktime 6.5.2
BUT ONLY FOR THE MAC VERSION. It could be a coincidence, but it appeared to work
(at least for fullscreen) when I last tested it on a MAC, but PAR is not implemented
for QT on Windows.
