[mythtv] Making Squished 4:3 -> 16:9 again for mytharchive DVDs?

Jay R. Ashworth jra at baylink.com
Thu Oct 5 17:23:26 UTC 2006


On Wed, Oct 04, 2006 at 09:44:39AM +0100, Nick wrote:
> On 04/10/06, Paul Bailey <bailey at dreamshake.net> wrote:
> > On 3 Oct 2006, at 11:49 pm, Jay R. Ashworth wrote:
> > > I'd be flat *amazed* if you ended up with a 4:3 scope recording
> > > off-air, BTW: how did you manage that?
> >
> > I might be wrong, but I think that's how widescreen SD DVB-T is
> > transmitted in the UK.  For example, on playing back one of my
> > widescreen recordings in MPlayer I see:
> >
> > Starting playback...
> > VDec: vo config request - 720 x 576 (preferred colorspace: Planar YV12)
> > Could not find matching colorspace - retrying with -vf scale...
> > Opening video filter: [scale]
> > VDec: using Planar YV12 as output csp (no 0)
> > Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
> > SwScaler: BICUBIC scaler, from Planar YV12 to Packed YUY2 using MMX2
> > VO: [macosx] 720x576 => 1024x576 Packed YUY2
> > [Mixer] No hardware mixing, inserting volume filter.
> >
> > If that is indeed what is happening, it's a *very* common occurence
> > on my system, probably 75% of what I record is SD widescreen.
> 
> That's how it's broadcast - the MPEG stream contains a flag that
> determines whether the video is transmitted/decoded as standard 4:3 or
> widescreen 16:9 - whatever the actual resolution of the video. Common
> sizes are 720x576, 704x576 and 544x576, and its the shape of the
> pixels, not just the dimensions of the stream, that are important.

Ah, the UK.  Ok.  That's the first time I'd run across a scope
broadcast -- and yeah, you could use pixel aspect for that.

This is covered, incompletely, on the Aspect Ratio page of the wiki,
for which I really need to make up some more diagrams...

Cheers,
-- jra
-- 
Jay R. Ashworth                                                jra at baylink.com
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