[theora] Closed Captioning
holger at convergence.de
Thu Dec 5 04:06:31 PST 2002
Ralph Giles wrote:
> On Wednesday, December 4, 2002, at 09:16 pm, Joe Straitiff wrote:
>> The main difference between the US and European versions are that the
>> european versions are all graphical (they do have sections talking about
>> character based encoding but it's so vague and up to implementation that
>> I've never seen anyone use it) and the US is fully character based.
>> So the
>> DVB is similar to DVD's subtitling, i.e. they use a graphics rendering
>> and push graphics through on their stream.
> Vector or raster graphics?
runlength encoded 1-, 2- 4- or 8-bit bitmaps. The encoding is pretty
<p>> We intend to use mng for raster overlays, which provides a superset of
> image-based subtitles. Of course character based ones are more flexible
> and accessible for alternate uses, but there are enough cases where the
> control (or simplicity) of graphic overlays make them worthwhile.
--- >8 ----
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