[MPlayer-users] How To: best way to rescale

[Rolf Ernst]

On Mon, Feb 22, 2010 at 10:06 PM, Ken Bass <daytooner at gmail.com> wrote:

> On Mon, Feb 22, 2010 at 5:29 PM, Rolf Ernst
> <rolf.ernst at silverlightning.org>wrote:
>
> > On Mon, Feb 22, 2010 at 7:16 PM, Ken Bass <daytooner at gmail.com> wrote:
> >
> > > On Mon, Feb 22, 2010 at 4:01 PM, Rolf Ernst
> > > <rolf.ernst at silverlightning.org>wrote:
> > >
> > > > On Mon, Feb 22, 2010 at 4:36 PM, Ken Bass <daytooner at gmail.com>
> wrote:
> > > >
> > > > > On Mon, Feb 22, 2010 at 12:09 PM, Oliver Seitz <info at vtnd.de>
> wrote:
> > > > >
> > > > > > Am 22.02.2010, 19:51 Uhr, schrieb Ken Bass <daytooner at gmail.com
> >:
> > > > > >
> > > > > > Another question would be, why would you want to rescale a video
> > > > without
> > > > > > recoding?
> > > > > >
> > > > >
> > > > > The reason is that I have several videos that won't play on my home
> > > > theatre
> > > > > system because it is limited to a resolution of 800x600. And, no,
> I'd
> > > > > rather
> > > > > not have to buy a new system at the moment. I just wondered if
> there
> > > > might
> > > > > be a way to quickly and easily rescale without fully recoding.
> > > > >
> > > > > And I wasn't sure recoding would give me any significantly better
> > > > quality,
> > > > > given the time it would take to do it (even with a 4 core 3Ghz
> system
> > > it
> > > > > might take longer to recode then the length of the video). But as
> you
> > > > > surmised, and I found out, the quality was much worse, so it's
> > probably
> > > > > best
> > > > > to just fully recode.
> > > > >
> > > > > So I'll just sit back, make some popcorn, have some coffee, and
> wait.
> > > > >
> > > > > Thanks for the explanation, though.
> > > > >
> > > > > FWIW: Necessity is the mother of invention. So we'll have to wait
> > till
> > > > some
> > > > > scientist needs it :-).
> > > > >
> > > > > ken
> > > > > _______________________________________________
> > > > > MPlayer-users mailing list
> > > > > MPlayer-users at mplayerhq.hu
> > > > > https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
> > > > >
> > > >
> > > > The resolution is part of the container information
> (AVI/MP4/MATROSKA).
> > > > Whatever this info says, that'll play. There is no recording
> involved.
> > > > Sometimes you can just edit this header information but most likely
> you
> > > > will
> > > > wind up remultiplexing which is still very fast and there is no
> quality
> > > > loss/encoding.
> > > >
> > > > /re
> > > > _______________________________________________
> > > > MPlayer-users mailing list
> > > > MPlayer-users at mplayerhq.hu
> > > > https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
> > > >
> > >
> > > Okay, that makes sense. Now (warning: stupid question) how would I do
> > that
> > > -
> > > edit/remux?
> > >
> > > ken
> > >
> > What container format do you have (what extension generally)? What
> > operating
> > system are you running?
> > _______________________________________________
> > MPlayer-users mailing list
> > MPlayer-users at mplayerhq.hu
> > https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
> >
>
> Most of the videos are AVIs. Some are WMVs and MPGs.
>
> I am running on linux - Fedora 12. I also have an XP box that I use for
> windows only apps. (FWIW, look at "MediaCoder" - www.mediacoderhq.com. The
> guy did a great job at building a gui front end to most of the general a/v
> transcoders).
>


> AVIs really do not know any aspect ratios, everything is square there.
> Don't know off hand WMV but MPG (is it MP4?) you can use mp4box. Matroska is
> the most versatile (which I use) and you use mkvtoolnix for that. Both
> mkvtoolnix and mp4box are available under Linux and Windows. Since AVI is
> such a pain in the neck and lacks this info I would suggest to simply
> multiplex that with mkvtoolnix (there is also a GUI). You can also inject an
> aspect ratio into the AVI file with the -aspect option but most players
> besides mplayer would ignore this.But you worry about resolution anyhow.
>

If mplayer does not properly detect your screen size you can also override
this with a parm, not sure off the top oxx my head but something like
-screenx or at least along those lines.

Now a really dumb question from me - why don-'t you just use mplayer -x XXX
-y YYY?