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

[Steven Adeff]

On 2/28/06, Loren Merritt <lorenm at u.washington.edu> wrote:
> On Tue, 28 Feb 2006, Steven Adeff wrote:
> > On 2/28/06, RC <rcooley at spamcop.net> wrote:
> >> On Mon, 27 Feb 2006 20:18:06 -0500
> >> "Steven Adeff" <adeffs.mythtv at gmail.com> wrote:
> >>
> >>> I noticed this too. Whats weird is the source is 1080, but I did
> >>> expand=0:-8:0:0 and it fixed it.
> >>
> >> Actually, I'd much rather recomend cropping 8 lines instead...  If you
> >> don't like that option for some reason, up-scaling to 1088 should be
> >> much better (effecient) than adding a black bar.
> >
> > I guess thats the problem. Remove data or deal with the encoding
> > inneficiencies of a black bar at the bottom of the video(or would it
> > be better to be at the top?)
>
> At least in x264, it's more efficient to leave it at 1080 and let x264
> decide what to stuff in the bar, rather than force blackness. Any
> compliant h264 decoder will crop it off on playback.
> (of course, scaling/cropping to 1088 or 1072 also work)

does x264 automatically make it 1088 then?

>
> > Though I don't know if the processing time is worth the space trade
> > off to go to mpeg2 so right now this is more academic for me...
>
> Then try mpeg4.

oops I mean to go to mpeg4, mpeg4 takes 5x the time to encode over
mpeg2 from my tests but only nets about 20% file size savings.

--
Steve