--- On Thu, 6/2/11, Lee Menningen <[email protected]> wrote:
> It could be worth it for it has at least two advantages: 1) it is
> widescreen, and 2) many DVD players may upscale the image
> (if it has sufficient bit rate as produced by HD but not SD) by a
> certain amount.
When converting a wide aspect ratio video for DVD, use anamorphic. That
stretches the video vertically to use the full resolution.
DVD players will generate pure black letterbox bars and shrink the video
vertically for 4:3 SDTV or display the full 480/576 lines and stretch the video
horizontally for HDTV displays.
Some DVDs of movies that have wider than 16:9 ratios will combine anamorphic
with narrow "hard" letterbox bars, which on some displays will result in "two
tone" letterbox bars. Usually the hard ones in the video are "off black" and
the DVD player generated ones are pure black. (As pure black as the display is
capable of.
What you don't have control over are displays that have the ability to stretch,
scale and zoom video which doesn't match their native aspect ratio. Many TVs
have a "smart" zoom and scale which crops off solid black areas at the top and
bottom while stretching the video vertically. Another thing some do is a
progressive horizontal stretch on 4:3 video where the center 40 to 60% is left
normal and the sides are stretched progressively more to fill the full width.
What some cable/satellite channels are doing now is letterboxing and
downscaling their HD video for transmission in SD 4:3. It looks horrible
because they crank up the compression really high. (I'm looking at *you* SPEED
channel!) It's a ploy to try and get people to pay more for HDTV because
they've made the SD video nearly unwatchable.
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