[mythtv-users] USA OTA - interlaced?

[Roger H]

On Wed, May 9, 2012 at 3:11 PM, Andre <mythtv-list at dinkum.org.uk> wrote:

>
> On 9 May 2012, at 20:59, Devin Heitmueller wrote:
>
> > On Wed, May 9, 2012 at 2:48 PM, Matt Garman <matthew.garman at gmail.com>
> wrote:
> >> Is there a way to tell if a given recording is interlaced or not?
> >> FWIW, I'm in Chicago, IL, USA.  We record the national networks,
> >> primarily FOX ("WFLD 32").
> >>
> >> I ask for the following reason: a while ago, I started experimenting
> >> with using Intel (Sandy Bridge) graphics, so I could lose my
> >> power-hungry Nvidia card.  During initial testing, I disabled
> >> de-interlacing in my playback profile.  And to this day, I still don't
> >> have any interlacing enabled, because everything plays back
> >> beautifully.
> >>
> >> So either I am recording progressive content, or my TV (Panasonic
> >> TC-P65V10) is doing the deinterlacing for me.
> >
> > Probably the fastest way to check is run ffmpeg against the recording
> > and look at the height/width.  A height of 720 is progressive and 1080
> > is interlaced (it is possible to have 1080 progressive, but you'll
> > never see it in an OTA broadcast).
>
> Um, well in the UK there are transmissions that switch between 1080i and
> 1080p on Freeview HD, there are also some Sky HD satellite transmissions at
> 1080p25.
>
> Some of the (American) encoder manufacturers told me they have had this
> feature for some time, so maybe it will be used.


While 1080p24 and 1080p30 are valid ATSC formats, I don't know of any
broadcasters that ever use them.  1080p60 is not currently a valid ATSC
format, but it potentially could be used with H.264 compression.
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