[MPlayer-DOCS] CVS: main/DOCS/man/en mplayer.1,1.813,1.814

[Reimar =?UTF8?Q?D=F6ffinger?=]

Hi,
> > > > @@ -682,6 +682,8 @@
> > > >  .B \-sstep <sec>
> > > >  Display one frame every <sec> seconds.
> > > >  Useful for slideshows.
> > > > +This uses normal seeking, and thus is just as inexact (i.e. with most formats
> > > > +you will get one frame between every <sec> and <sec> + 120 seconds).
> > > 
> > > 120 sec is 2 minutes. Is -sstep really that inacurate?
> > 
> > Well, I guess I should have written "with some files" instead of "with
> > most formats". But yes, you usually can seek only to keyframes and e.g. with many
> > DivX files I have they are sometimes 2 mins or further apart (maybe those are bad encodes
> > but still).
> > Feel free to change it to what you find apropriate, but some ppl had
> > problems with this option, so at least some warning should be there.
> 
> What about:
> 
> Since MPlayer can only seek to the next key frame this may be inexact
> if there is less than one keyframe every <sec> seconds.

This is fine with me although it still is inexact. If there is e.g. a keyframe every <sec>-1 seconds, it will step by 2*<sec>-2 seconds...
Also, keyframes usually will not be at equal distances. So the only case where it will surely work is when all frames are keyframes (uncompressed,
MJPEG, HUFFYUV (I think) and most others with bad compression ;-) ).

Greetings,
Reimar Döffinger