[mythtv-users] aspect ratio of home video recordings in video library

[Jeremy Jones]

On Sat, Feb 9, 2013 at 10:18 AM, Jay Ashworth <jra at baylink.com> wrote:

> ----- Original Message -----
> > From: "Jeremy Jones" <jeremy.dwain.jones at gmail.com>
>
> > both ffprobe and mediainfo report the DAR as 16:9 and the resolution
> > as 720X480.
> >
> > Just to see what would happen I ran the file through mkvmerge with the
> > following command:
> > mkvmerge -o test.mkv --aspect-ratio 0:'16/9' test.mpg
> >
> > here is the resultant file:
> > test.mkv <http://db.tt/oCOoeWYM>
>
> This plays correctly in mplayer2, which says:
>
> VIDEO:  720x480  29.970 fps  8900.0 kbps (1112.5 kB/s)
> Aspect ratio is 1.78:1 - scaling to correct movie aspect.
> VO: [xv] 720x480 => 853x480 Planar YV12  [fs]
>
> Right, but if you drop it in your video library and play it with myth,
does it recognize the 'scaled dimensions' should be:  853x480 ?  or does it
display at the 720x480 resolution?


That aspect should be 1.85:1 for 16:9, and 720x480 is actually D1 4:3 (or
> very close*), with the expected 0.9:1 pixel aspect; it only becomes a
> widescreen image aspect if you assume square pixels.
>
> I'm not sure what you are trying to tell me here.  Are you saying that
myth is doing the right thing and that I need to actually transcode the
video to *force* square pixels to make myth display the video correctly?
 From what I have gathered the video stream is standard mpeg-2, NTSC which
is 720x480, and the PAR is 32:27, which *should* yield a resultant display
resolution of 853x480.
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