[mythtv-users] Permanently overriding aspect ratio for specific recordings
Karl Dietz
dekarl at spaetfruehstuecken.org
Tue Aug 20 14:26:16 UTC 2013
On 20.08.2013 16:05, Marius Schrecker wrote:
>
> On Tuesday, August 20, 2013 15:30 CEST, "Michael T. Dean"
> <mtdean at thirdcontact.com> wrote:
>
> On 08/20/2013 05:00 AM, Marius Schrecker wrote:
> > Hi again,
> >
> > For a period, my set top box was spitting out to my hd-pvr in the
> > wrong format (4:3 instead of 16:9). This was handled okay by the tv,
> > but the recordings made during this time are all windowboxed and
> > compressed horizontally.
>
> Note, too, that it's possible--depending on how it's broken--that fixing
> the videos may be as simple as changing the display aspect ratio in the
> stream (i.e. may not require actually decoding/scaling/re-encoding the
> video). I don't know which tools are best to use to do this, though.
> I'll poke around in the files themselves to see if the aspect can be
> patched there.
see DVB Document A154 on frame compatible plano-stereoscopic DVB-3DTV
Annex B: HDTV service compatibility. [1]
Basically you fiddle with the H.264 bitstream to enable frame cropping
and change the sample aspect ratio.
The sample aspect ratio would be the same value as anamorphic HDTV
16:9 in 1440x1080 pixels. Then enable cropping and set proper offsets.
I have no idea if our player supports that. So a small sample from such
a file could go into the our sample file collection.
Regards,
Karl
[1] http://www.dvb.org/technology/standards/a154_DVB-3DTV_Spec.pdf
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