[MPlayer-dev-eng] [DOCS] [3rd try] missing option descriptions
diego at biurrun.de
Sat Aug 30 11:32:09 CEST 2003
D Richard Felker III writes:
> On Mon, Aug 25, 2003 at 02:00:37AM +0200, Arpi wrote:
> > > - (no)autoexpand
> > >
> > > Rich made some mysterious rumbling about this being a very obscure
> > > option that was added for some encoding work he needed to do and he
> > > was unsure whether such a hack should be documented at all.. I'd
> > > say document or remove, so I guess we should go for the former.
> > ok this is not easy.
> > as you probably know, OSD rendering in g1 is handled by vo drivers.
> > (it has historical reasons, osd existed before filter layer).
> > but mencoder doesnt use libvo, but users still want osd rendering with it,
> > to render subtitles into the encoded avi (which is silly anyway).
> > to workaround this, mencoder by default inserts the 'expand' video filter,
> > which can do the osd rendering. but since we support slices, and DR and some
> > other tricks has been done in vf_expand, sometimes it's broken/buggy/slow,
> > so it's better not inserting it at all. so, to avoid auto-inserting expand
> > filter in mencoder, you can use -noautoexpand
> Yes, Arpi is mostly right about this, but it has another use. IMO,
> subtitles look MUCH better when rendered at high resolution then
> scaled by swscaler, as opposed to rendered at low res. So when I was
> making small encodes with hardcoded subs for hopeless WMP users who
> can't figure out how to install the .srt filter or whatever :))))) I
> wanted to render subs at the beginning of the filter chain rather than
> the end. However, mencoder's auto-inserted vf_expand always renders
> subs, so it was double-rendering them, and doing it in a bogus manner
> since the OSD code does not support multiple instances (image/font
> size are initialized only once)... The only clean way I found around
> this problem was to allow the user to disable the auto-inserted expand
Hmm, this is tricky indeed. What about:
Do not automatically insert the expand filter into the MEncoder filter chain.
Useful to control at which point of the filter chain subtitles are rendered
when hardcoding subtitles onto a movie.
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