[mythtv] transcoder documentation.

[Mark Edwards]

> > > the second method can be used on already transcoded files, and only
the
> > > frames immediately following a cut section will be reencoded (thus
there
> > > is very minimal quality loss)
> > is this true?   I've been waiting for this feature for a long time, but
> > there's been no info in mythtranscoder about it - heck, mythtranscoder
> > doesn't even tell me what format to give the starttime in.
>
> ok, so mythtranscoder uses the myth time format:  YYYY-MM-DDTHH:MM:SS (T
> being an actual letter T).

It doesn't actually matter what separator you use, its ignored as long as
there is *something* there
so T could be Z, as could all the other separators (-, :) etc