On Mon, 19 Jan 2004 [EMAIL PROTECTED] wrote:
> I am in doubt about what aspect ratio to use
> when encoding SVCDs from a widescreen source.
4/3
> giving a better quality. When playing the
> SVCD at a normal TV (aspect ratio 4:3), the
> DVD player will add black borders to fit
> the image into the TV screen.
That is what you would expect to happen.
As Alexei mentioned (and I have observed the same thing) many DVD/VCD
players do NOT perform the letterboxing function for SVCD/VCD. In
fact I have yet to encounter a DVD player that will pay attention to
the aspect ratio flags in a SVCD MPEG file.
> Am I right expecting better quality results
> with a 16:9 aspect ratio in the SVCD?
Marginally. The SVCD frame size is the same 480x480 for both 4/3
and 16/9 - only the flags bits in the MPEG header are changed.
With the flags set to 16/9 the display will be 854x480 rather than
640x480 (if the flags are set to indicate 4/3). The visual quality
might actually go down a little since 480 pixels are being stretched
to 854 horizontally.
Software players do the right thing so for computer based playing you
can use 16/9 SVCDs but so far the standalone players do not perform
the aspect conversion/letterboxing.
Cheers,
Steven Schultz
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