[MPlayer-users] Re: 1080i to 1080p mpeg2 or x264?

[Steven Adeff]

On 3/1/06, Steven Adeff <adeffs.mythtv at gmail.com> wrote:
> On 3/1/06, Guillaume POIRIER <poirierg at gmail.com> wrote:
> > Hi,
> >
> > On 3/1/06, Steven Adeff <adeffs.mythtv at gmail.com> wrote:
> >
> > > sorry, for mpeg4 x264, not straight mpeg4. x264 encodes take quite a
> > > bit longer than mpeg2 and don't show that much of a space savings
> > > using the more default commands.
> > >
> > > What commands should I turn on is the question... I'm not well versed
> > > in what the commands do which is why I'm trying to see if someone here
> > > has done a lot of x264 encodes and has a good grasp on what to use.
> > > I've found this type of information for doing xvid encodes so I'm
> > > wondering if anyone has done any experimenting in optimizing x264
> > > settings for HD streams or knows what the "settings" are for how h264
> > > will be implemented for HD-DVD and such.
> >
> > Did you RFTM? http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-x264.html
> >
> > Guillaume
>
> well, using the settings at the bottom of that page for "Very High
> Quality" I'll say, the space saving are incredible, roughly 1/5 the
> filesize of the mpeg2 encode, the problem is, still not as sharp.
> Playback on a 50"+ screen will show noticeable difference between the
> two.
>
> I'll have to go through the information on that page to try and find
> suitable settings for doing a true very high quality encode. Slightly
> higher bitrate should do the trick I think, so its just a matter of
> playing around with the settings.

With a constant quality encode I get a file thats 200meg less than my
mpeg2 encode and won't playback smoothly. next I want to try a
constant q encode to see how that turns out.

Also, with Xvid, I can set a negative bitrate for two-pass mode that
will have mencoder make the output file size the value I set, this
doesn't seem to work with x264. So, how do I run a 2pass x264 encode
that will finalize on a filesize I specify?


Thanks!
--
Steve