Subject: [mythtv-users] Question about nuvexport & transcoding in general

[Joseph A. Caputo]

On Tuesday 23 September 2003 20:06, Dennis Lou wrote:
> From: "Joseph Caputo" <caputo at qedinfo.com>
> >Okay, so I've finally got nuvexport & its
> >dependencies working.  I've made a
> >few 320x240 divx files that turned out pretty
> >well, with cutlists process
> >and everything.  Then I tried a high-quality
> >divx for archiving... my
> >capture profile is 480x480, so I told nuvexport
> >to create a 480x480 divx.
> >What I got was a 'squashed' picture which
> >(almost) filled the vertical but
> >had black bars on either side.  My question:
> >does mythtranscode, when
> >outputting raw video, scale the output
> >(say, to 640x480)?  In my mind, that
> >would explain it.  Can anyone elaborate on
> >what's going on?  Or do I just
> >need to specify additional scaling options to
> >mplayer to present the picture
> >correctly?
> 
> To answer your questions in order:
> 
> mythtranscode does not scale the output.  The
> problem is that mythbackend squishes the picture
> when you record, and mythfrontend unsquishes
> it when you play back.  When you specify 480x480
> to nuvexport, you are saying you want to save the
> video as squished.  Additional scaling options
> to mplayer will present the picture correctly,
> but if you want to provide clues for mplayer
> to unsquish it, type "256 -aspect 1.333333" instead
> of "256" when it asks you for the video
> bit rate (you can use values other than 256 if you
> want as well).  Or save it as 640x480 and it will
> write unsquished video to the AVI.


Thanks!

-JAC