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

[Rolf Ernst]

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
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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